Technical description and composition of the THOMSON 32LB040KG TV, panel type and modules used. The composition of the modules.THOMSON
Model: 32LB040KG 32LB040
Chassis / Version: EFC031
Panel: V320B1-L01
T-CON: V320B1-C
Inverter (backlight): VIT70002.00 Rev5
PWM Inverter: OZ964SN
Power Supply (PSU): KB-6150. 1W EFC031E 2146896B
PWM Power: STR A6159
MainBoard: 21474990 IFC130-230
IC MainBoard: SAA7117A, MSP46XYK, STA515W, PW118B
Tuner: IFC130 / 230 2147511A FE6233B FE6232A
Specifications 32LB040S5
THOMSON 32LB040KG
General recommendations for TV LCD repair
Possible malfunctions
- THOMSON 32LB040KG 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.
With such manifestations, the KB-6150 power module 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 of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying a PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) STR A6159, in the absence of external damage and a short circuit between the terminals, are checked by replacing them with a known good one.
- 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.
The defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of the lamps or the inverter.
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 go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the ifc130-230 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - SAA7117A, MSP46XYK, STA515W, PW118B with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
If the TV operates normally from external devices, but does not tune to TV channels, the IFC130 / 230 2147511A FE6233B FE6232A tuner may malfunction. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
The lack of an image in the presence of a signal from THOMSON 32LB040S5 is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix), 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, disassembly of the 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 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 the MainBoard, as well as synchronization signals from T-CON to loops with drivers.
Once again, we remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repairs to professionals with sufficient experience in the field of electronic repair.
Additional MainBoard RepairThe appearance of MainBoard 21474990 is shown in the figure below:
21474990
External view of the power supply
The main features of the THOMSON 32LB040KG device:
Installed matrix (LCD panel) V320B1-L01.
Matrix control uses the Timing Controller (T-CON) V320B1-C.
The VIT70002.00 inverter is used to power the backlight lamps, it is controlled by the OZ964SN PWM controller.
The formation of the necessary supply voltages for all nodes of the THOMSON 32LB040KG TV is carried out by the KB-6150 power module, or its analogs using STR A6159 microcircuits.
MainBoard - the main board (motherboard) is a module 21474990, using chips SAA7117A, MSP46XYK, STA515W, PW118B and others.
Tuner IFC130 / 230 2147511A FE6233B FE6232A provides reception of television programs and tuning to channels.
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 32LB040S5 with LCD display, diagonal size 32 "(81 cm) 16: 9 format. Screen brightness 550 cd / m2 is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is not less than 1000: 1. You can 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 Stereo sound with two built-in speakers, NICAM stereo processing and Sound Surround.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, S-Video, component, SCART x2, RGB, 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 THOMSON 32LB040S5 LCD TV panel is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!