Technical description and composition of the SUPRA STV-LC32ST880WL TV, panel type and modules used. The composition of the modules.
SUPRA LED
Model: STV-LC32ST880WL
Chassis / Version: V1N08
Panel: JHD315GH-E52
T-CON: T320XVN02.9 CTRL BD 32T24-COC
LED driver (backlight): integrated into MainBoard
PWM LED driver: SELC2010M
MOSFET LED driver: AOU3N50
Power Supply (PSU): integrated into MainBoard
PWM Power: AP2161
MainBoard: RSAG7.820.5697 / ROH Stiker: LHD32D33WT (1) (0)
IC MainBoard: CPU: MSD6308RTE-SW A7MKH79D, Nand flash: H27U4G8F2DTR, EERPROM: FM24C32A, Audio: TPA3110D2
Tuner: SIDT-10A2 / 111A24 / RoH
Control: Service Mode: MENU-BALANCE-1969-MENU
STV-LC32ST880WL Specifications
SUPRA STV-LC32ST880WL
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TV SUPRA STV-LC32ST880WL does not turn on and does not show any signs of operation at all. No response to the remote control and front panel control buttons.
In such cases, the common power supply is often faulty - the AC / DC converter of the mains voltage, which is combined with the elements of the RSAG7.820.5697 main board. It is necessary to measure its output supply voltages, and in case of their absence, 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, the converter can operate in a short-circuit mode, and in case of a short circuit in the elements of the primary circuit, the mains fuse is usually cut off.
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 controllers (PWM) AP2161, if they have no visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- 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.
As a rule, in this case, the backlight of the LED panel is faulty. Often the reason is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver turns out to be faulty.
It is impossible to check the LED bars for a break without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light a single 3V LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off, or pierced in the K / Z.
- 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 RSAG7.820.5697 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). When repairing an MB board, you need to check its components CPU: MSD6308RTE-SW A7MKH79D, Nand flash: H27U4G8F2DTR, EERPROM: FM24C32A, Audio: TPA3110D2. Defective elements must be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
If you suspect a malfunction of the SIDT-10A2 / 111A24 / RoH tuner, first of all, you need to make sure the software is correct, as well as the presence of the required supply voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Once again, we remind TV users: do not attempt to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
The appearance of the MainBoard RSAG7.820.5697 is shown in the figure below:
RSAG7.820.5697
Main features of SUPRA STV-LC32ST880WL device:
Installed matrix (LED panel) JHD315GH-E52.
The matrix control uses the T320XVN02.9 Timing Controller (T-CON).
To power the backlight LEDs, a converter combined with the RSAG7.820.5697 main board is used, controlled by the SELC2010M PWM controller. The keys of the AOU3N50 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 converter circuit using AP2161 microcircuits.
MainBoard - the main board (motherboard) is an RSAG7.820.5697 module, using CPU chips: MSD6308RTE-SW A7MKH79D, Nand flash: H27U4G8F2DTR, EERPROM: FM24C32A, Audio: TPA3110D2 and others.
The SIDT-10A2 / 111A24 / RoH tuner provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC32ST880WL with LCD JHD315GH-E52, 32 "(81 cm) 16: 9. The required screen brightness of 300 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 80000: 1 is achieved by special control operation of LEDs depending on the illumination of areas in the scene.This model uses an LED-panel with an edge arrangement of backlighting LEDs - Edge LED.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic resolution 720p (HD Ready) ...
STV-LC32ST880WL has built-in SMART software and pre-installed Android operating system. Internet connection can be made via Wi-Fi wireless connection. The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping takes place in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power of 16 W (2x8 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, component, VGA, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi. A headphone output is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: With stand 736x500x180 mm, Without stand 736x455x68 mm.
TV weight: 7.9 kg.
Attention! Panel JHD315GH-E52 SUPRA LED TV STV-LC32ST880WL is an expensive and unreliable element.
Do not allow any impacts 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 non-repairable.