THOMSON LED
Model: T19E31U
Chassis / Version: HK-T.SP7168V02D
Panel: MT185GW01 V.1 // MT185GW01 V.4 // MT185GW01 V.3
LED driver (backlight): AYD221602 3BD0003418
Power Supply (PSU): AYP250008 3BS0014314 REV 1.0
PWM Power: PWM SOT23-6
MainBoard: HK-T.SP7168V02D HK-10090027
IC MainBoard: T16-75HIP, H5DU2562GTR-E3C, SPV7168M, YD1517P
Tuner: TDQ-3EG3 BG / 4 R 1U / I028
Specifications T19E31U
THOMSON T19E31U
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- The THOMSON T19E31U TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
A malfunction in such cases should be started to look in the circuits of the AYP250008 power supply. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is most often cut off.
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) LA8517JG - 2 pcs, MP1482DS, in the absence of external damage and short circuit between the terminals, are checked by replacing them with known good ones.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. The reason may be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To test the LED strips, in order to open all the transitions of the LEDs, several tens of volts or more are needed; it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED junctions in forward bias, you can sometimes detect the presence of a protective zener diode PN junction by connecting the probes in the opposite direction. If the zener diode is cut off or broken in K / Z, then the LED is faulty and requires replacement.
- 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 HK-T.SP7168V02D 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). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - T16-75HIP, H5DU2562GTR-E3C, SPV7168M, YD1517P. In cases where a BGA processor is used, its malfunction is usually detected by a local warm-up method.
If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the TDQ-3EG3 BG / 4 R 1U / I028 tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
If the THOMSON T19E31U has no picture, but there is sound, the MT185GW01 V.1 display backlight often 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 MT185GW01 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 HK-T.SP7168V02D 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 trace the passage of LVDS signals from MainBoard HK-T.SP7168V02D with an oscilloscope, as well as synchronization 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.
Remember! Attempts to self-repair the THOMSON T19E31U TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Additional MainBoard RepairThe appearance of the MainBoard HK-T.SP7168V02D is shown in the figure below:
HK-T.SP7168V02D
External view of the power supply
The main features of the THOMSON T19E31U device:
Installed matrix (LED panel) MT185GW01 V.1 or MT185GW01 V.4 or MT185GW01 V.3.
The LED driver AYD221602 is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the THOMSON T19E31U TV is carried out by the AYP250008 power module, or its analogs using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a HK-T.SP7168V02D module, using T16-75HIP, H5DU2562GTR-E3C, SPV7168M, YD1517P and others.
Tuner TDQ-3EG3 BG / 4 R 1U / I028 provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: INNOLUX
Model: MT185GW01 V.1
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 12S3Px2CN WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV THOMSON T19E31U with LCD MT185GW01, diagonal 19 "(48 cm) in 16: 9 format. The declared brightness of the screen is 250 cd / m2, provided by modern LED backlight LED. The ratio of maximum brightness to minimum (contrast) is not less than 1000 : 1. The LCD panel uses Edge LED backlighting. You can view 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. The digital signal (graphic format) is formed in the 480i, 480p, 576i, 576p, 720p standards, and the multimedia formats are supported: MP3, WMA, MPEG4, JPEG.
The power of the sound system of 6 W (2x3 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
An external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, S-Video, component, SCART, VGA, HDMI, 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.
Attention! The MT185GW01 V.1 panel of the THOMSON T19E31U 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.