Technical description and composition of the THOMSON 15A08F50 TV, panel type and modules used. The composition of the modules.THOMSON
Model: 15A08F50
Chassis / Version: 15A08 / GM21RU
Panel: HT150X02-100
PWM Inverter: TL494C
MOSFET Inverter: 4606
Power Supply (PSU): AD048S110-220-12 Adapter 12V 4.2A
MainBoard: 40-LDM21B-DIE4XG
IC MainBoard: GM2221-LF, 24C16, SST39SF020A, TVP5147, TDA9886T
Tuner: 07-389F15-NA4G = F07WP-3B-E (TDA6509ATT)
Specifications 15A08F50
THOMSON 15A08F50
General recommendations for TV LCD repair
Possible malfunctions
- THOMSON 15A08F50 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or blink, the TV does not respond to the remote control and control buttons.
Often in such cases, the AD048S110-220-12 power supply module is faulty.
This TV model is equipped with an external power supply unit such as AD048S110-220-12 Adapter 12V 4.2A, which the owner can purchase independently, and its repair may not always be advisable, however, sometimes it makes sense to open it and eliminate simple typical defects. typical for SMPS. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no image, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
These manifestations can be triggered by the power module, or by defects in the inverter, as well as by skewed currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you should ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open.
If, when diagnosing a malfunction, it is required to turn off the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are completed, it is imperative to restore the protection circuits for the further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the 40-LDM21B-DIE4XG motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - GM2221-LF, 24C16, SST39SF020A, TVP5147, TDA9886T which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its pins with the board (indicated by warming up).
Before changing the tuner 07-389F15-NA4G = F07WP-3B-E (TDA6509ATT), if it is not possible to tune to TV channels, you should make sure that there are supply voltages that must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, to repair the backlight, disassembly of the HT150X02-100 LCD panel is required - a painstaking process that requires increased attention and accuracy from the master. In such cases, there is a possibility, with the slightest negligence, to damage the glass or loops and the TV may become unrepairable.
We strongly do not recommend doing such work to owners of TVs and craftsmen who do not have experience in repairing LCD panels! Moreover, at home (at the owner's home).
If there is no image in the presence of backlight, the screen becomes slightly lighter when turned on, and if the TV is open, the light from the lamps can be seen through the holes in the panel case.
In this case, there may be a malfunction inside the panel, damage to strips, loops, the T-CON board (Timing Controller) may be defective. But the main board MainBoard 40-LDM21B-DIE4XG often turns out to be faulty; a software failure is also possible.
In such cases, the master first of all needs to check the main supply voltage of the panel at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for line and column drivers - VGH, VGL, Vcom.
If all of the above measurements are within normal limits, then the oscilloscope should track the passage of LVDS signals from MainBoard 40-LDM21B-DIE4XG, as well as synchronizing signals from T-CON to loops with drivers.
Once again, we remind TV users: you should not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
The appearance of the MainBoard 40-LDM21B-DIE4XG is shown in the figure below:40-LDM21B-DIE4XG
40-LDM21B-DIE4XG can be used in TVs:
THOMSON 15A08F50 (Panel HT150X02-100), THOMSON 20A08F50 (Panel A201SN02 V.5).
External view of the power supply
The main features of the THOMSON 15A08F50 device:
Installed matrix (LCD panel) HT150X02-100.
To power the backlight lamps, a converter controlled by the TL494C PWM controller is used. Keys of type 4606 are used as power elements of the inverter.
To power all the internal nodes of the THOMSON 15A08F50 TV, an external source such as AD048S110-220-12 Adapter 12V 4.2A is used.
MainBoard - the main board (motherboard) is a 40-LDM21B-DIE4XG module, using GM2221-LF, 24C16, SST39SF020A, TVP5147, TDA9886T microcircuits and others.
Tuner 07-389F15-NA4G = F07WP-3B-E (TDA6509ATT) provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: BOE
Model: HT150X02-100
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.0 inch
Resolution: 1024x768, XGA
Display Mode: TN, Normally White, Transmissive
Active Area: 304.128x228.096 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 60%
Response Time: 2/6 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 3.3V
LCD TV THOMSON 15A08F50 with LCD display HT150X02-100, diagonal size 15 "4: 3 format. Screen brightness 250 cd / m2 is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is at least 500: 1 The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC The digital signal formation (graphic format) is performed in the standards 480i, 480p, 576i, 576p.
Speaker power 10 W (2x5 W) is provided by two speakers. Uses the NICAM stereo signal processing system and the Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x2, audio x2, S-Video, component, VGA. A headphone jack is provided. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768.
Attention! The HT150X02-100 panel of the THOMSON 15A08F50 LCD TV is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!
