Do-it-yourself tv rollsen repair. The TV does not turn on - tips for users and experience for TV technicians

The Rolsen company relatively recently appeared on the Russian market. But in this short period of time, its products have become widespread. Unlike other manufacturers, the company has its own production in Russia. The company's bestsellers are TVs with a screen diagonal of 14 and 21 inches. They will be discussed in this article.

Consider the device, adjustment and repair of Rolsen C1420 / C2120 TVs. Both models are made according to the same scheme (see figure). The main technical characteristics of TVs are presented in Table. one.

Chassis design and working principle

The chassis consists of three boards: the main board (Main-board), the kinescope board (Y-board) and the board with low-frequency input/output connectors (AV-board).

Consider the paths for the passage of audio and video signals, as well as the main elements of their processing.

Video path

To receive and process television signals, an A101 analog tuner of the TDQ-5B6M type is used. To control the tuner, its inputs VT, BL, BH, BU receive signals from the microcontroller (MK) N001. Tuning voltage is applied to the VT input of the tuner. It is formed from a voltage of 33 V using a filter V001, C003, C118, RT01, R007, controlled by a PWM signal MK (pin 2). The tuning voltage varies from 0.5 to 30 V, which allows you to tune the receive frequency within the selected range. The VHF-L, VHF-H, UHF bands are selected by applying a high potential (5 V) to the corresponding tuner input BL, BH, BU. For this, the keys VE01-VE03 are used, which are controlled by the MK with a pin. 8-10. The AGC signal required to maintain the output signal of the IF tuner at the required level is generated by the N201 chip (pin 8). It is fed to the output. AGC tuner through the filter RE06, RE05, R108, CE05, C117. To power the tuner on its pin. BM is supplied with 5V.

The IF output signal with a frequency of 38.9 MHz is taken from the pin. The IF of the tuner and through the buffer on the transistor V102 enters the band-pass filter Z101, which forms the required frequency response of the intermediate frequency channel. The output antiphase signal from the filter is fed to the input of the N201 microcircuit - pin. 6, 7.

Further signal processing is performed by the N201 microcircuit of the TV1238AN type. The microcircuit includes image and sound IF paths, a video detector, an audio demodulator, a sync selector, AGC, AFC circuits, a sync processor, a PAL / NTSC color decoder and a video processor. The microcircuit is controlled via the digital I2C bus (pin 26, 27) by the signals of the microcontroller N001 (pin 37, 38). From the output of the video detector (pin 47 N201), the full color video signal and the 2nd IF sound signal are fed through the buffer V202 to the inputs of the filters L205 Z204, and L207 Z202, which extract the IF sound signal from the video signal. Depending on the sound standard, the MK over the I2C bus, using the N202 switch, turns on the necessary filter in the video signal path. From the output of the switch (pin 13 N202), the video signal is fed to the input of the color decoder of the N201 chip (pin 43). If the video signal is encoded in the SECAM color system, then it is processed using an external decoder - an N203 chip of the TA1275Z type. For this, the video signal from the output. 35 N201 through the buffer V201 enters the pin. 13 and 15 N203. On the output 17 N203 are three-level strobe pulses SCP with pin. 34 N201. The output color difference signals of the decoder are removed from the pin. 3 and 5 and are fed for further processing to the N201 chip. The video processor of the N201 chip has an RGB signal switch. The external input of the switch (pin 13-16) receives the video signals of the "insertion" of the OSD image, which are generated by MK (pin 22-25). The output RGB signals are taken from the pin. 18-20 of the N201 microcircuit and through the XS808 connector enter the kinescope board.

Output video amplifiers are located on the kinescope board. All three channels are assembled according to an identical single-stage circuit and do not have any features. Unfortunately, the scheme does not provide for the stabilization of the dark current of the kinescope rays. Output video signals through current-limiting resistors R917-R919 are fed to the kinescope cathodes. To power the video amplifiers, voltages of 190, 12 and 9 V are supplied to the kinescope board.

Sound path

As already noted, the audio signal is processed in the N201 chip. The signal of the second IF sound is removed from the pin. 47 N201 and through the buffers V202 and V204 enters the inputs of the filters Z202, Z204, Z205, Z207, Z208, forming the frequency response of the IF sound path. The necessary filter is included in the audio IF signal path using the N202 switch, controlled by the MK via the I2C bus. The output signal of the IF sound from the switch (pin 3) is fed for further processing to the N201 chip (pin 53). Depending on the mode of operation of the TV, the signal from the sound demodulator or the sound signal from the audio input, which is fed from the XSA03 connector to the pin, passes to the output of the N201 chip. 55 N201. The sound signal is removed from the pin. 2 N201 and fed to the input UMZCH - vyv. 7 N601 type TDA 2611A (output power - 5 W), from the output of which (pin 2) through the XSA10 connector goes to the TV speakers.

To block the sound, the MK generates a high potential at the pin. 4, which through the diode D005 opens the key V602 and the input of the UMZCH microcircuit is closed to a common wire. The V503 transistor circuit serves to block sound until an image appears.

UMZCH N601 is powered by 18 V (pin 1) from the power supply of the TV (IP).

Synchroprocessor, vertical and line scanning

For horizontal and vertical scanning, the synchroprocessor of the N201 microcircuit generates trigger pulses.

The synchroprocessor is powered by 9 V.

Horizontal scan trigger pulses with pin. 32 N201 are sent to the V501 driver and from its output - to the horizontal scanning output stage on the elements V502, TDKS T100. The output stage generates a deflecting current in the H-COIL line coils (connected via the XSA07 connector), the supply voltages of video amplifiers (190 V) and other circuit nodes (5, 14 and -27 V). S-correction raster capacitors C512 and C515 are connected in series with the horizontal coils. Capacitors C504 and C505, connected to the collector of transistor V502, determine the flyback time (OX) of the horizontal scan, and hence the horizontal size of the raster. Horizontal linearity is adjusted with the L506 coil. Reverse pulses for horizontal scanning synchronization are taken from the winding 4-10 TDKS T100 and are fed through the circuit R512, C518, R511 to the pin. 30 N201. To synchronize the OSD image, OX pulses are taken from the winding 4-7 of the TDKS T100 and fed through the divider R509 C514, R510 to the pin. 26N001. The horizontal scan is powered by 24 and 115 V voltages generated by the TV's power supply.

The time-setting capacitor of the vertical scan generator C219 is connected to the pin. 22 N201 chips. Personnel sawtooth pulses are removed from the pin. 24 N201 microcircuits and go to the vertical scan output stage - the N401 microcircuit of the TA8403 type. The microcircuit contains a power amplifier, an OX pulse generator and a thermal protection circuit. V-COIL OS V-COIL frame coils are connected to its output (pin 2) through the XSA07 connector. To stabilize the vertical size, the feedback voltage is removed from the resistor R410, included in the chain of frame coils, and the circuit C408 C407 R403 is fed to the pin. 23 N201. The same signal is used by the circuit on the elements V504-V509, which generates the east-west correction signal. To synchronize various nodes of the MK (in particular, OSD images), OX pulses of a vertical scan with a pin. 7 N401 through the inverter V010 are fed to the pin. 27 MK. Capacitor C405 serves to double the supply voltage of the output stage during the vertical sweep reverse. This is necessary to ensure the required duration and rate of rise of the deflecting current during the vertical sweep reverse.

For the operation of the beam current limiting circuits (ABL) and automatic contrast limiting (ACL), a voltage proportional to the current of the kinescope beams is removed from the capacitor C520, connected in series with the secondary winding of the TDKS T100. It charges capacitor C218. If the voltage on it becomes less than a certain value, the diode D204 opens and on the pin. 21 N201 (ABCL), a low potential is generated, which causes the ABL and ACL circuits to operate.

microcontroller

The TV control system is based on the N001 television microcontroller of the TMP87CM38N type from TOSHIBA based on an 8-bit processor. The microcircuit has a 32 KB ROM, 1 KB RAM, six 8-bit ADCs, and two I2C interfaces. For the initial reset of the microcircuit nodes on its pin. 33, when the power is turned on, the circuit on the transistor V002 generates a RESET signal - a pulse of negative polarity. The microcontroller is synchronized by an internal oscillator, the frequency of which is stabilized by a BC01 quartz resonator (10 MHz) connected to pin. 31 and 32 chips. The settings parameters and operational adjustment values ​​are stored in non-volatile memory N002 of the AT24C08 type, which is connected to the first I2C interface (pin 5, 6). The N201 chip is connected to the second I2C interface (pin 37, 38). To pin. 16 and 17 N001 are connected to the control panel buttons, and to the pin. 35 - output of photodetector IR01.

To switch the IP to standby mode, the N001 microcontroller generates a high potential on the pin. 7, which opens the key V805 and the cathode of the N801 optocoupler is connected to a common wire. As a result, the error amplifier on the V806 transistor stops working and the IP starts operating in the minimum power consumption mode.

The microcontroller is powered by a voltage of 5 V from a linear regulator on the elements D828, V801.

Source of power

The IP of the TV generates constant stabilized voltages of 115/130, 24, 18 and 5 V and is implemented according to a pulse converter circuit, the basis of which is an oscillator on the V804 transistor and a T804 pulse transformer. The positive feedback circuit (POS) includes the 1-2 T804 winding and the R808 and C816 elements connected to the base of the V804 transistor. These elements determine the operating frequency of the converter. To start the converter, the R804-R806 circuit is connected between the mains rectifier output and the V804 base circuit. To stabilize the output voltages, a feedback circuit is used on the elements V806, N801, V802. The node on the elements V806, D812 controls the line voltage of 115 V and generates an error signal, which, through galvanic isolation (optocoupler N801), controls the node on transistors V802, V803. This node changes the duration of the control pulses based on the V804, which leads to the stabilization of the output voltages of the IP. The secondary channels do not have any features, except that the voltage of 5 V (used to power the MK in standby and operating modes) is formed using a linear stabilizer on the elements D828, V801.

Electrical adjustments

Before this operation, turn on the TV and warm it up for 15 ... 20 minutes.

To make electrical adjustments, you will need the following equipment:

television signal generator (for example, LASPI-2);
oscilloscope with a bandwidth of at least 50 MHz;
static kilovoltmeter;
digital multimeter (eg DT890B);
kinescope degaussing device (external degaussing loop).

Supply voltage monitoring

1. Connect a digital voltmeter to the positive terminal of capacitor C822.
2. Set the minimum contrast and brightness of the image.
3. Variable resistor RV801 set the voltage 115/130 V (depending on the diagonal of the TV).

AFC adjustment

1. Send an IF signal (38.9 MHz) color bars to the pin. IF tuner A101.
2. Rotate the core of the L103 circuit until the “colored stripes” picture appears on the screen.
3. Select the SELF VCO parameter in the service menu (see below for information on how to operate in service mode).
4. Press the AFT OK button on the service panel.
5. After a few seconds, “AFT OK” will appear on the screen.

AGC adjustment

1. A signal from a television signal generator is fed to the antenna input of the TV (level -62 dB, frequency - channel 69).
2. Connect a digital voltmeter between the common wire and the pin. AGC tuner A101.
3. In the service menu, select the RAGC parameter.
4. Set the parameter value to 3F and determine the current voltmeter reading. Then reduce the value of the RAGC parameter until the voltmeter reading drops 0.4 V below the previous value. The resulting value of the RAGC parameter is optimal if it does not increase the noise level.

Geometry adjustment

1. Serve a test signal grid on a dark background to the antenna input of the TV from the generator.
2. Enter the service menu and use the VLIN, HPOS, HITS, VP50 parameters to achieve minimal raster distortion.
3. If necessary, adjust the S-correction of the raster (barrel type distortion) using the VSC parameter.

White balance adjustment

Note: before this operation it is necessary to demagnetize the kinescope using an external degaussing loop.

1. Turn off the blue background in the user menu, turn off the antenna.
2. Enter the service mode.
3. Set RCUT, GCUT, and BCUT to 80, GDRV and BDRV to 45, and BRTS to C0.
4. Set the minimum brightness and contrast of the image.
5. Set the SCREEN control on the horizontal transformer so that the raster is barely visible.
6. Connect a voltmeter between the common wire and the G2 contact on the kinescope board and measure the voltage.
7. Using the SCREEN regulator, reduce the voltmeter reading by 25 V.
8. In the user menu, set the brightness and contrast to the middle position.
9. In the service menu, set the F6 value for the BRTS parameter.
10. Black and white stripes are fed to the antenna input of the TV from the generator.
11. In the service menu, set the parameters GCUT and BCUT to the minimum value, and RCUT to the average.
12. In the user menu, set the brightness and contrast to the minimum position.
13. On the service panel, press the LINE button, a yellow line should appear on the screen.
14. By changing the values ​​of the GCUT and BCUT parameters, the white color of the line is achieved.
15. Turn off and turn on the TV.
16. Set the required values ​​for color saturation, brightness and contrast.

Sub-brightness adjustment

1. Apply color bars to the antenna input of the TV from the generator.
2. In the user menu, set the brightness and contrast to the minimum position.
3. In the service menu, set the value of the BRTS parameter so that the brightest band is barely visible.

Service mode

Setting the factory settings

Turning on the service mode of the TV is carried out using a special remote control, which is supplied separately for service organizations. To enter the service menu, press the "D" button (service mode) on it. Then use the "-P" and "+P" buttons to select the required service menu parameter. To change the parameter value, use the "-" and "+" buttons. The "r / s" button turns on the mode in which parameters are available related to the adjustments of geometry, color, brightness, contrast, AFC and AGC. The main parameters adjusted in this mode are directly accessible from the corresponding buttons and do not require the inclusion of the service mode "D". In this case, buttons that have a numerical value (for example, GCUT + 10), when pressed, change the value of the parameter in accordance with this numerical value (+10). If you need to change the parameter more precisely, use the - and + buttons.

When replacing some elements of the TV (kinescope, TDKS, N001, N002, N201, N401 microcircuits), it is necessary to check the compliance of the values ​​of the service menu parameters with the factory values ​​(Table 2) and, if necessary, set the required values.

Autotest

When the TV is turned on, the following TV components are automatically tested:
POWER (power);
BUS (I2C interface data bus);
SYNC (I2C interface synchronization bus).

Let's consider how these nodes are tested and what can be done to eliminate the problems that have arisen.

power

MK N001 controls the stability of voltages of 9, 18, 24 and 115 V. During normal operation, the constant potential on the pin. 18 N001 (PROTECT) is +5 V. If one of the controlled voltages disappears, the constant potential on the pin. 18 becomes lower than +3 V. The voltage control circuit starts to work, which includes a counter for the total duration of potential drops on the pin. 18 N001 is below +3 V. The total sum of the fall times is displayed at the end of the POWER line. The time of the fall of the potential on the pin. 18 below +3V for one second equals 16 units in the number displayed on the POWER line. Since the maximum value of the counter is 128, the maximum time for voltage drops below +3 V, fixed by the counter, is 8 s. The counter is reset only when the protection is activated and the TV is automatically turned off (this happens when one of the controlled voltages fails for 8 s). In this case, the counter is reset to zero and “000” (green) is displayed at the end of the line. All other numbers in the POWER line are highlighted in red, while at the end of the fourth line of AUTO TEST a red NG message appears. The next change in the color of the symbols to green and resetting the counter will occur again when the protection is triggered and the TV automatically turns off.

You can forcibly reset the counter and reset the number in the line (in this case it will turn green). To do this, turn on the TV and close the pin. 18 N001 through a 3 kΩ resistor to common for 8 s. After this time, the protection will work and the TV will automatically turn off.

After that, you need to remove the installed jumper. The next time you turn on the TV, the code 000 will be green at the end of the POWER line. If the message OK is displayed in the BUS and SYNC lines, then AUTO TEST: OK will also be displayed in the fourth line.

Bus

If the I2C interface data bus is OK, a green OK message is displayed at the end of the BUS line. In other cases (errors, failures, malfunctions), the color of the message in this line will be red (Table 3).

Sync

If the I2C clock bus is working properly, a green OK symbol appears at the end of the SYNC line in autotest mode. If there is no synchronization, a red NG message appears in this line.

Typical malfunctions and methods for their elimination

Autotest does not complete, TV does not work

Determine the faulty node (see the description of the autotest) and eliminate the cause.

The TV does not turn on, the POWER indicator on the front panel does not light up, the mains fuse F801 blows

Disconnect the TV from the network and with an ohmmeter check for a short circuit the elements of the demagnetization circuit, surge protector, rectifier: T801, C801, C802, RT801, RT802, D803-D806, C808-C814. If these elements are working, then the V804 transistor is checked with an ohmmeter. Capacitor C819 is checked by the replacement method. If the specified elements are serviceable, replace the T804 transformer.

The TV does not turn on, the POWER indicator does not light up, the mains fuse F801 is OK

The power supply circuit of the power transistor V804 is broken, the elements of the converter are faulty

Turn on the TV with the S801 mains switch and measure the +300 V voltage at the V804 collector. If the voltage is zero, check for an open circuit S801, F801, T801, R803, D803-D806, T802, pin. 3-7 T804, V804. If there is a voltage of 300 V, and the converter does not work (there are no pulses with a swing of about 500 V on the V804 collector), check the following elements: R804-R806, V802-V804, C816, R808, D810, N801, pin. 1-2 T804.

The secondary circuits of the power supply are faulty, the standby stabilizer +5 V (IC703)

If the converter is working (there are pulses with a swing of about 500 V on the V804 collector), and there are no output voltages of the power supply, disconnect the TV from the mains and check all secondary circuits for a short circuit with an ohmmeter. If there are output voltages, but they are significantly underestimated (by 50-70%), check the 5 V stabilizer (D828, V801).

POWER indicator is on, TV does not turn on

One of the microcircuits (N001 or N002) or their external elements are faulty

Check the presence of a pulse of negative polarity on the pin. 33 N001 when the TV is turned on. If it is not there, elements D004, V002, C021 are checked. If there is a signal, check the health of the resonator BC01 (10 MHz). They make an attempt to turn on the TV and check for a low potential (0 V) at the pin. 7N001. If it is not there, the N002 and N001 microcircuits are successively replaced. If everything is normal, check the operation of the synchroprocessor and the horizontal scanning circuit (see description).

IP overload protection enabled

The presence of low potential on the pin. 18 N001 at the moment the TV is turned on, it indicates the operation of the protection circuit. The source of the accident is determined - the 18 or 24 V bus and eliminate the cause.

No raster and sound

One of the voltages on the kinescope board and kinescope is missing: Uheat, Uscreen, Ufocus, Ueht, 9, 12 and 190 V Check for the presence of the indicated voltages, determine the missing and eliminate the cause. If there is no high voltage (there is no characteristic crackling when the TV is turned on and off), then this is due to the horizontal scanning circuit. Check the presence of trigger pulses on the pin. 32 N201, their entry into the preliminary stage on the V501 transistor and the operation of the output stage on the V502 transistor (there should be positive polarity pulses on the collector with a swing of about 1000 V). If the output stage does not work, disconnect the TV from the network and check all its elements. If there are pulses, but there is no high voltage, the reason is TDKS T100.

Faulty video processor (inside N201)

If the video signals have a swing of about 1 V per pin. 18-20 N201 missing, replace this chip.

There is a raster, there is no sound and image, the OSD menu works

Check the power supply (5 V) of the A101 tuner. Then a test signal is fed to the antenna input of the tuner from the generator, the auto-tuning mode is turned on and the corresponding control signals are checked at the tuner outputs (see description). If there are signals, but the output signal IF (range 0.25 ... 0.5 V) is absent, replace the tuner. If there is no one of the control signals, eliminate the cause. Most often, the 33 V stabilizer (D002) fails.

If there is an IF signal at the output of the tuner and it is fed to the input of the N201 chip (pin 6-7), the elements of the video path are checked (see description).

TV channels are not memorized in auto search mode

As a rule, this is due to a change in the parameters of the L203 circuit. Slightly change the setting of the VCO T101 circuit (screw or turn the circuit core a quarter of a turn). Then turn on the auto search mode and check the operation of the TV. If there is no result, then adjust this circuit in the service mode (see Electrical adjustments).

There is an image, there is no sound, UMZCH is working

First, check the absence of a sound blocking signal on the pin. 4 MK (see the description of the audio path) and the serviceability of the keys V503 and V602. Then, in the mode of receiving a television signal, the passage of the audio signal along the path is checked (see description). Identify and replace the failed path element.

TV does not respond to remote control commands

Faulty remote control

First, install known good batteries in the remote control. To check, use an IR range photodiode, for example, FD-8K, connect its outputs to the oscilloscope input, direct the remote control to the photodiode and press one of the remote control buttons. On the oscilloscope screen, there should be bursts of pulses with an amplitude of about 0.5 V. If they are not there, check the health of the elements of the remote control circuit: microcircuit, resonator, output transistor and LED. It is also necessary to clean the remote control board and the rubber band from dirt.

Faulty photodetector IR01, microcontroller N001 Press one of the buttons on the remote control and check for a signal with an amplitude of 4 ... 4.5 V on pin. 3 IR01. If there is no signal, replace the photodetector. If there is a signal, the microcontroller is faulty.

The image is dominated by any of the colors, the black and white image has a pronounced color tint

As a rule, this happens due to the failure of one of the transistors (V901-V903) of the video amplifiers on the kinescope board or a change in the parameters of the kinescope itself due to its aging. To eliminate the defect, the oscilloscope checks the signal paths R, G, B, and also adjusts the white balance in the service mode (see paragraph 3).

No color image in SECAM color system

Most likely, the N203 chip or its external elements are faulty. Set the saturation control to the maximum level. They check the power supply of the microcircuit (5 V on pin 16, 18), the presence of a video signal on pin. 13 and 15 N203, strobe pulses on the pin. 17 N203, external elements C709-C712. If the check did not reveal any faulty elements, replace the microcircuit.

Linearity broken horizontally

If using the L506 regulator it is not possible to adjust the horizontal linearity, check all elements of the correction circuit: D511, D512, C535, C536, L504, L505, L507, L509, R518, R519.

A bright horizontal line is visible on the screen

The N201 chip or its external elements are faulty

Check sawtooth pulses with a swing of 1 ... 1.5 V on the pin. 24 N201 chips. If they are not there, check the capacitors C219-C221 and the elements of the feedback circuit: R402, R404, R406, R407, C407. If the check did not reveal any faulty elements, replace the microcircuit itself.

The N401 chip or its external elements are faulty

If the sawtooth pulses on the pin. 4 N401 is, and the output signal on the pin. 2 is missing (signal swing is about 45 ... 50 V), the following elements are checked: L401, V-COIL, C408, R407. If they are working, replace the chip.

The vertical size is small and not adjustable in service mode

Check the elements of the voltage boost circuit D402 and C405.

The vertical linearity is broken and it is not adjustable in the service mode

Check capacitors C401, C402, C405, C406, C408 (preferably by replacement). If they are serviceable, replace the N401 chip.

No sound or picture when working with LF input

Check the presence of the corresponding signal (sound - on pin 55 N201, and video signal - on pin 41 N201). If there are signals, replace the N201 chip.

What to do if the Rolsen TV does not turn on?

Rolsen products are renowned for their reliability, durability and good build quality. However, a problem due to which the Rolsen TV does not turn on can take the owner of the equipment by surprise. This can indicate both a minor malfunction of the device, which the user can deal with on their own, and a significant breakdown, which will require the help of a qualified master of the service center "For Repair!"

This problem may occur due to power surges, software failure, power supply failure, capacitor burnout, system board failure, or failure of other machine components.

Why won't my Rolsen TV turn on?

Depending on the cause of the problem, the TV may behave differently:

• the light on the panel of the device flashes several times - a specific number of flashes indicates a specific malfunction (self-diagnosis);
• the indicator lights up continuously - this indicates that current is flowing to the power supply, however, the protection of the unit does not allow the device to be turned on;
• the light is off - this may indicate a breakdown of the power supply;
• The TV makes unusual sounds: clicks, crackling, etc.

The diagnostics that our masters produce at the first stage will definitely show the real reason for the incorrect behavior of the TV. But, before contacting our service center, we recommend that the owners of the equipment do the following:

• turn off the TV panel and try to activate it from the button on the panel, and not from the remote control;
• turn off the device for 20-25 minutes;
• check the performance of the batteries in the remote control;
• disconnect external devices from the TV.

If you have performed these steps, but the Rolsen TV does not turn on, as before, feel free to call our company and we will send a specialist who will perform repairs at home as soon as possible.

Rolsen TV professional repair

Based on the diagnostic results, the master is ready to repair or replace the following parts:

• power supply;
• inverter;
• microcircuits;
• condenser;
• other components.

Modern Rolsen TVs have a rather complicated device, so it is almost impossible to make repairs on your own. Company "To repair!" always ready to help our clients. We provide services in Moscow and St. Petersburg.

Just one look at Rolsen TVs proves the high level of quality. Picture, sound, color - everything is fine. And if suddenly this is not the case, if the equipment fails, shows with interference, there are extraneous noises, it is necessary to reanimate it. And the sooner the better. Entrust this business to professional telemasters. Only they are able to provide a comprehensive repair of Rolsen TVs (Rolsen). It is not a problem for them to eliminate even the most complex technological defects in the TV system. A specialized tool does not cause damage to equipment, which owners usually do when trying to fix defects themselves. The vast experience of telemasters allows us to cope with the tasks quickly and efficiently.

Do you want to order TV repair?Rolsen(Rolsen)?

We are ready to provide assistance at home, for this, please tell us by phone (or through the form on the website) your contact details, with the desired time of arrival. By indicating the brand of the TV, the nature of the malfunction, you will allow the specialist to take additional spare parts, which may be indispensable for the resuscitation of equipment. After rendering technical assistance, you will receive a long-term warranty card for the service. Democratic prices will pleasantly surprise you, and a free visit of the master to your home will be an additional bonus.

Do you have any questions? Feel free to ask them by contact phone number, we will be happy to help!

Rolsen C29SR57 Slim

Faults:

* Pincushion distortion . The capacitor C704 0.033 microfarad 630 volts and the damping diode VD705 HER306 failed.

* HOT lights up. And it burns out quite interestingly: we put a new one, turn it on, everything works. The image is without claims, the transistor does not heat up, it works for a long time - it stood on the run for about 2 hours. But it is worth turning it off and on again - the transistor breaks through.

The cause turned out to be one of the snubber diodes: a very slight leak (about 50 kOhm).

Rolsen C21R45 SLIM

Chassis KD-035B

Defect: everything works, but in standby mode there is a loud beeping.

Replace in the primary IPP C519, in the secondary IPP C555, C556

ROLSEN C 2116

Faults

* automatically turns off after 5-8 seconds .

PROTEKT tire problem C028 leak (ceramic)

* No sound on AV. The reason is a defect on the part of the manufacturer. The AUDIO IN input is not static protected. If you make a connection on a working TV, then the breakdown of the input of the TB1238AN video processor (55 foot) is ensured. The way out: you still need to change the video processor one way or another, but to be safe for the future, it is advisable to additionally install a 30 .... 40 kOhm resistor from pin 55 to ground.

Rolsen C21R92/95

Processor TDA9381PS/N2/2I1373

Defect: It turns on, passes the test, writes OK and immediately goes to the duty room. When included in the service, it starts normally, there are no complaints about the picture. I began to turn off protections one by one (they are the most typical ones for processors of this series, if you need details, look) it turned out that it is turned off by BCF (ABB control). What is most interesting is that the picture at this time is beautiful. I tried to replace the TDA6107 video amplifier and it all worked.

Rolsen C-2119

Defect: there is no menu in Russian, the volume is at full and is not adjustable. The volume is turned off only when the VOL value is 0. The problem is in the firmware, and it is advisable not just to reflash, but to replace the EEPROM itself (pre-flashing, of course).

Rolsen C2131

Defect: There is interference in the form of thin lines on the screen and the picture trembles frame by frame, the frame chip overheats. The reason turned out to be very unexpected: there was no load resistor in parallel with the vertical deflection coil. How he worked before that is simply incomprehensible ...

Rolsen C-2116

After passing the autotest, it gives an error BUS 011. The reason is the LA7910 chip is faulty

ROLSEN C2116, 2118, 2119

The diode bridge periodically flies out (more precisely, one or two diodes in the bridge without any obvious reasons). I randomly replaced the network capacitor - the repetitions stopped. Apparently there was a short break.

ROLSEN C2112FR

Fault: poor reception from the air. Tried to change the tuner TDQ-5B6M - did not help.

The reason is insufficient AGC voltage. Capacitance CE05 is faulty on the AGS leg of the tuner (small leak)

ROLSEN C2118

Fault: does not start in operating mode. When measuring, it turned out that the voltage at the output of the PSU is too low. The reason turned out to be a + B 220 uF \ 160V capacitor.