Technical description and composition of the THOMSON 32B2600 TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: 32B2600
Chassis / Version: TP.MS18VG.P77
Panel: LVW320C8OT EB1
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3350CP
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 LD7536R
MainBoard: TP.MS18VG.P77
IC MainBoard: CPU: MST3M182VGC-LF-TZ, Flash: 25Q32
Tuner: R620D
Specifications 32B2600
THOMSON 32B2600
General recommendations for TV LCD LED repair
Possible malfunctions
- THOMSON 32B2600 does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
First of all, in such cases, you should make sure that the common switching power supply (SMPS) - the AC / DC voltage converter of the mains voltage - is working. All source elements in this TV model are located on the MainBoard TP.MS18VG.P77. It is then necessary to measure its output voltages and, in their absence, the power switches 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, the converter can usually operate in an emergency mode in a short-circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM regulators (PWM) PWM SOT23-6 LD7536R, if they do not have visible damage to the case and an outright short circuit between the pins, are usually checked by replacement.
- There is no picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and disappears immediately
In such cases, the most likely malfunction of the LED panel backlighting elements. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
To check the health of the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED separately with a simple Chinese multimeter (powered by 9 volts) in the P-N transition test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black one to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. The serviceability of the PN junction of the Zener diode indirectly indicates the serviceability of the LED-a
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the TP.MS18VG.P77 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 - CPU: MST3M182VGC-LF-TZ, Flash: 25Q32 with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
If THOMSON 32B2600 has no picture, but there is sound, often the LVW320C8OT display backlight simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image with a successful hit of external light on the screen.
Replacing the LEDs requires disassembling the LVW320C8OT LCD panel - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to the owners of TVs and craftsmen who do not have experience in repairing LCD panels
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV, light can be seen through the holes in the panel case.
In this case, the panel may also be faulty - damage to the strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But the main board MainBoard TP.MS18VG.P77 often turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, the fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within the normal range, it is necessary to use an oscilloscope to trace the passage of LVDS signals from MainBoard TP.MS18VG.P77, as well as synchronizing signals to loops with drivers.
Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.
The malfunction of the NoName tuner is established after checking the software and all supply voltages at its outputs. The data exchange of the tuner with the processor via the I2C bus can be monitored with an oscilloscope.
Users and owners of TVs should remember that attempts to self-repair a THOMSON 32B2600 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH EEPROM -----------> THOMSON 32B2600, Main: TP.MS18VG.P77, Panel: LVW320C8OT EB1
The appearance of the MainBoard TP.MS18VG.P77 is shown in the figure below:TP.MS18VG.P77
TP.MS18VG.P77 can be used in TVs:
ERISSON 24LET35 (Panel LVW240CMOT E1 V2), ERISSON 19LET35 (Panel M185XTN01.3), FUSION FLTV-24C10 (Panel LVW230SSOT E1 V2), FUSION FLTV-32C10 (Panel LVW320CSOT E81 V7), HYUNDAI H-LED32V19 (Panel LVW320CSOT E45 V10), HYUNDAI H-LED32V23 (Panel LVW320C80T E64 V5), TCL 19T2100 (Panel M185XTN01.2), TELEFUNKEN TF-LED32S23 (Panel LVW320CS0T E146 V1), THOMSON 32B2600 (Panel LVW320C8OT EB1), THOMSON 28B2500 (Panel LVW280CSOT E13V1).
The main features of the THOMSON 32B2600 device:
Installed matrix (LED-panel) LVW320C8OT EB1.
To power the backlight LEDs, a converter is used, combined with the main board TP.MS18VG.P77, controlled by the OB3350CP PWM controller.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using PWM SOT23-6 LD7536R microcircuits.
MainBoard - the main board (motherboard) is a TP.MS18VG.P77 module, using CPU chips: MST3M182VGC-LF-TZ, Flash: 25Q32 and others.
The R620D tuner provides reception of television programs and tuning to channels.
LED TV THOMSON 32B2600 with LCD LVW320C8OT, diagonal size 32 "(81 cm) 16: 9 format. The declared brightness of the screen of 250 cd / m2 is provided by modern LED backlight LED. The ratio of maximum brightness to minimum (contrast) is not less than 4000 : 1. This TV's LCD panel technology uses LED backlighting It can be viewed in high quality HD at a resolution of 1366x768 pixels in 720p standard (HD Ready). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. signal (graphic format) is produced in the standards 480i, 480p, 576i, 576p, 720p Supported multimedia formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, 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, HDMI, USB. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768.
Overall dimensions: 740x450x115 mm.
Attention! The LVW320C8OT EB1 panel of the THOMSON 32B2600 LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.