Technical description and composition of the THOMSON T22E27U TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T22E27U
Chassis / Version: MT27
Panel: V216BG1-LE1
LED driver (backlight): integrated into PSU
PWM LED driver: MAP3204
MOSFET LED driver: MDS1903
Power Supply (PSU): 40-ES2410-PWC1XG
PWM Power: FAN6754
MainBoard: 40-MT2700-MAA2XG (H)
IC MainBoard: MT8227AAKU 1229-BMSL, 25Q32BVSIG, TPA3113D2, D13N3LT
Tuner: 18273 TCL
Control: RC3000M13
Specifications T22E27U
THOMSON T22E27U
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- The THOMSON T22E27U TV does not turn on and does not show any signs of operability at all. No response to the remote control and front panel control buttons.
With similar manifestations, a malfunction is most likely found in the 40-ES2410-PWC1XG power module. It is necessary to measure its output supply voltages, and if they are absent, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
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 most often breaks off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. FAN6754 PWM microcircuits are usually checked by replacing them with new ones, or knowingly working.
- There is no image, there is sound, it reacts to the remote control. Or the image may appear for a second when turned on and disappear immediately.
Usually, in such cases, a malfunction is detected in the LED panel backlight nodes. 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 check the LED strips for breakage without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter; a voltage of the order of several tens of volts is required.
- 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 40-MT2700-MAA2XG 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). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - MT8227AAKU 1229-BMSL, 25Q32BVSIG, TPA3113D2, D13N3LT. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
If the THOMSON T22E27U does not have an image, but there is sound, often the V216BG1-LE1 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 V216BG1-LE1 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 40-MT2700-MAA2XG 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 40-MT2700-MAA2XG 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.
In cases where there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as that the supply voltages on the terminals of the 18273 TCL tuner are in line. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
Owners and users of the THOMSON T22E27U TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to the complete non-repairability of the device!
Additional MainBoard RepairThe appearance of the MainBoard 40-MT2700-MAA2XG is shown in the figure below:
40-MT2700-MAA2XG
External view of the power supply
The main features of the THOMSON T22E27U device:
Installed matrix (LED-panel) V216BG1-LE1.
A converter combined with a power supply is used to power the backlight LEDs, and is controlled by the MAP3204 PWM controller. The keys of the MDS1903 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the THOMSON T22E27U TV is carried out by the 40-ES2410-PWC1XG power module, or its analogs using FAN6754 microcircuits.
MainBoard - the main board (motherboard) is a 40-MT2700-MAA2XG module, using MT8227AAKU 1229-BMSL, 25Q32BVSIG, TPA3113D2, D13N3LT chips and others.
Tuner 18273 TCL provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V216BG1-LE1
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 477.417x268.416 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 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 12S4P WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV THOMSON T22E27U with LCD V216BG1-LE1, diagonal size 22 "(56 cm) 16: 9 format. The declared brightness of the screen of 250 cd / m2 is provided by modern LED backlight LED. less than 1000: 1. The design of the LCD panel uses a backlight with an edge arrangement of LEDs - Edge LED. It is possible to view in high quality HD at a resolution of 1366x768 pixels in the 720p standard (HD Ready). Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC Digital signal formation (graphic format) is performed in the standards 480i, 480p, 576i, 576p, 720p, 1080i Multimedia formats are supported: MP3, MPEG4, DivX, 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.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, 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, 1360x768.
The power consumed by the TV from the network in operating mode is not more than 25 watts.
Dimensions: with stand 524x370x187 mm, without stand 524x337x46 mm.
TV weight: without stand: 3.6 kg.
Attention! The V216BG1-LE1 panel of the THOMSON T22E27U 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.