THOMSON
Model: 32LB052B5
Chassis / Version: EFC031E
Panel: V320B1-L01 Rev. C4
Lamp backlight: 16 LAMP CCFL
Inverter (backlight): VIT70002.60 REV: 4 I320B1-24-V04-L2B0
Power Supply (PSU): DANGER 24V, 12V
PWM Power: STR-A6159
MainBoard: 2147499B & 2148309B EFC031E
IC MainBoard: PW2300, MSP4610K, STV6415DD
Control: IR: 2147612A-0A-S0 IFC130E
Specifications 32LB052B5
THOMSON 32LB052B5
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- THOMSON 32LB052B5 TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
In such cases, the DANGER power supply usually fails. It is necessary to make sure that its output voltages are present and, if they are completely absent, check the power switches and rectifier diodes for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
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 picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and immediately disappears
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.
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 indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 2147499B motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software).
The lack of an image in the presence of a signal from THOMSON 32LB052B5 is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) V320B1-L01 Rev. C4, for example, a malfunction of CCFL (EEFL) lamps, and outside in their power source - an inverter.
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, disassembling the V320B1-L01 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 often the main board MainBoard 2147499B also 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 the normal range, then the oscilloscope needs to track the passage of LVDS signals from MainBoard 2147499B, as well as synchronizing signals from T-CON to loops with drivers.
Attention to users! Self-repair of the THOMSON 32LB052B5 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard 2147499B is shown in the figure below:
2147499B
The main features of the THOMSON 32LB052B5 device:
Installed matrix (LCD panel) V320B1-L01 Rev. C4.
The formation of the necessary supply voltages for all nodes of the THOMSON 32LB052B5 TV is carried out by the DANGER power module, or its analogs using STR-A6159 microcircuits.
MainBoard - the main board (motherboard) is a 2147499B module, using PW2300, MSP4610K, STV6415DD and others.Additional technical information about the panel:
Brand: CMO
Model: V320B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 32.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 708.954x398.592 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LCD TV THOMSON 32LB052B5 with LCD V320B1-L01, 32 "(81 cm) 16: 9 diagonal. Screen brightness of 550 cd / m² is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum to minimum brightness is not less than 1000: 1. Can be viewed in high quality HD at a resolution of 1366x768 pixels in 720p standard (HD Ready) Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC.
Speaker power 20 W (2x10 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 x2, S-Video, SCART x2, RGB. A headphone jack is provided.
Overall dimensions: 956x532x102 mm.
TV weight: 23 kg.
Attention! THOMSON 32LB052B5 LCD TV panel V320B1-L01 Rev. C4 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!