Technical description and composition of the THOMSON 32HR5230 TV, panel type and modules used. The composition of the modules.THOMSON
Model: 32HR5230
Chassis / Version: 08-MT21006-MA300AA
Panel: LTA320AP02
T-CON: 320AP03C2LV0.3
Inverter (backlight): SSI320 4UA01
PWM Inverter: OZ9966SN
MOSFET Inverter: KMB054N40DB, STU432S
Trans Inverter: LT-U3208
Power Supply (PSU): 40-PWL32B-PWD1XG
PWM Power: VIPer22, L6563, L6599
MOSFET Power: 2SK3568
MainBoard: 08-MT21006-MA300AA
IC MainBoard: CPU: MT8221, SPI Flash: W25X32VF
Tuner: TEDE8-601A
Specifications 32HR5230
THOMSON 32HR5230
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- The THOMSON 32HR5230 TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
Most likely, in this case, the main switching power supply (SMPS) 40-PWL32B-PWD1XG is faulty. It is then necessary to measure its output voltages and, if they are absent, the power switches (2SK3568) and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and less often the current sensor in the source of the key.
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 VIPer22, L6563, L6599, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or known to be working properly.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
These manifestations can be provoked by the power module, or by defects in the inverter, as well as by the skew of 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, ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open circuit.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- 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 08-MT21006-MA300AA 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). Complicated MB (SSB) repair is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements CPU: MT8221, SPI Flash: W25X32VF requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by the warm-up method.
Before replacing the TEDE8-601A tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its outputs. You also need to make sure that the tuner and processor can exchange data via the I2C bus.
The lack of an image in the presence of a signal from THOMSON 32HR5230 is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LTA320AP02, for example, a malfunction of the CCFL (EEFL) lamps, and outside in their power source - the inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, repairing the backlight requires disassembling the LTA320AP02 LCD panel - a painstaking process that requires special attention and accuracy from the technician. 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 08-MT21006-MA300AA 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 08-MT21006-MA300AA, as well as synchronization signals from T-CON to loops with drivers.
Owners of the 32HR5230 TV are advised to contact only qualified specialists with the necessary experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
The appearance of the MainBoard 08-MT21006-MA300AA is shown in the figure below:08-MT21006-MA300AA
External view of the power supply
The main features of the THOMSON 32HR5230 device:
Installed matrix (LCD panel) LTA320AP02.
Matrix control uses Timing Controller (T-CON) 320AP03C2LV0.3.
To power the backlight lamps, an SSI320 inverter is used, controlled by the OZ9966SN PWM controller. An LT-U3208 transformer is installed in the inverter converter. KMB054N40DB, STU432S keys are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the THOMSON 32HR5230 TV is carried out by the 40-PWL32B-PWD1XG power module, or its analogs using VIPer22, L6563, L6599 microcircuits and 2SK3568 power switches.
MainBoard - the main board (motherboard) is a 08-MT21006-MA300AA module, using CPU chips: MT8221, SPI Flash: W25X32VF and others.
The TEDE8-601A tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AP02
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
THOMSON 32HR5230 LCD TV with LTA320AP02 LCD, 32 "(81 cm) 16: 9 diagonal. Screen brightness of 500 cd / m² provided by CCFL (EEFL) backlight. Dynamic contrast ratio of 25000: 1 is achieved by special backlight control in depending on the brightness of the scene. It is possible to view in high quality HD at a resolution of 1366x768 pixels in the 720p standard (HD Ready). 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, 720p Media formats supported: JPEG.
Speaker power of 10 W (2x5 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART x2, RGB, VGA, HDMI x3, USB. 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, 1360x768.
The power consumed by the TV from the network in the operating mode is not more than 100 watts.
Dimensions: with stand 796x570x222 mm, without stand 796x535x91 mm.
TV weight: with stand: 12 kg, without stand: 11.6 kg.
Attention! The LTA320AP02 panel of the THOMSON 32HR5230 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!
