Technical description and composition of the THOMSON T28RTE1020 TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T28RTE1020
Chassis / Version: 35018209
Panel: LVW280CSDXE1 V7
T-CON: ST3151A05-8-XC-3
LED driver (backlight): integrated into MainBoard
PWM LED driver: OZ9902CGN
MOSFET LED driver: CS630 A4H
Power Supply (PSU): integrated into MainBoard
PWM Power: FAN6755
MOSFET Power: 7N65L
MainBoard: 35018209 2013-09-22 REV-01
IC MainBoard: SPI FLASH Winbond: 25S32BVS1G, HDMI: IT6633E-P, Sound: STA333W
Tuner: TDA18273
Specifications T28RTE1020
THOMSON T28RTE1020
General recommendations for TV LCD LED repair
Possible malfunctions
- THOMSON T28RTE1020 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.
In such cases, the AC / DC converter of the mains voltage, which is combined with the main board 35018209, is often faulty. Its output voltages should be measured, and if they are absent, check the serviceability of the power switches (7N65L) of the converters and rectifier diodes for the probability of a 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 most often breaks 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 the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) FAN6755, in the absence of external damage and short circuit between the terminals, are checked by replacing them with known good ones.
- There is no image, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
In some of these cases, the malfunction is caused by the lack of display backlighting. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
Without a special current source, it is impossible to check the line of series-connected LEDs, and it is unsafe for them to use any voltage sources over 12V for this purpose. Then all that remains is to open the panel and check each LED separately. Typically, Chinese multimeters with a 9V power supply lightly light up one 3-volt LED if you connect the probes to it in the forward direction, the red probe to the anode, and the black one to the cathode. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off or pierced in the K / Z.
- 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 motherboard 35018209 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). Complicated MB (SSB) repair is possible only in the conditions of a service center with the necessary equipment. Checking or replacing SPI FLASH Winbond: 25S32BVS1G, HDMI: IT6633E-P, Sound: STA333W requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by the warm-up method.
If the TV normally works from external devices, but does not tune to TV channels, the TDA18273 tuner may be faulty. 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.
Owners and users of the THOMSON T28RTE1020 TV should remember that self-repair without special knowledge, skills and qualifications may be fraught with negative consequences that can lead to the complete non-repairability of the device!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> THOMSON T28RTE1020, Main: 35018209 2013-09-22 REV-01, Panel: LVW280CSDXE1 V7
The appearance of MainBoard 35018209 is shown in the figure below:35018209
The main features of the THOMSON T28RTE1020 device:
Installed matrix (LED panel) LVW280CSDXE1 V7.
Matrix control uses the ST3151A05-8-XC-3 Timing Controller (T-CON).
To power the backlight LEDs, a converter is used, combined with the main board 35018209, controlled by the OZ9902CGN PWM controller. The keys of the CS630 A4H type are used as power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using FAN6755 microcircuits and 7N65L power switches.
MainBoard - the main board (motherboard) is a 35018209 module, using SPI FLASH Winbond chips: 25S32BVS1G, HDMI: IT6633E-P, Sound: STA333W and others.
The TDA18273 tuner provides reception of television programs and tuning to channels.
LED TV THOMSON T28RTE1020 with LCD display, diagonal size 28 "(71 cm) 16: 9 format. The declared brightness of the screen of 305 cd / m2 is provided by modern LED backlight LED. The ratio of maximum brightness to minimum (contrast) is not less than 3000: 1. The LCD panel uses direct backlighting with LED backlit - Direct LED. It can be viewed in high quality HD at a resolution of 1366x768 pixels in 720p standard (HD Ready). Supported media formats: MP3, MPEG4, HEVC (H.265), Xvid, 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, component, VGA, HDMI x2, USB. A headphone jack is provided. The digital tuner has the ability to receive television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV from the network in operating mode is not more than 45 watts.
Dimensions: with stand 635x427x180 mm, without stand 635x387x89 mm.
TV weight: with stand: 3.7 kg, without stand: 3.3 kg.
Attention! The panel of a THOMSON T28RTE1020 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.