Technical description and composition of the SUPRA STV-LC40T900WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC40T900WL
Chassis / Version: V1N07
Panel: V390HJ5
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3350CP
Power Supply (PSU): integrated into MainBoard
PWM Power: OB2276
MOSFET Power: TO-220
MainBoard: TP.SIS231.PT71
IC MainBoard: CPU: SIS231, SPI Flash 25Q64, NT5CB64M16FP, AUDIO: TPA3110LD2
STV-LC40T900WL Specifications
SUPRA STV-LC40T900WL
General recommendations for TV LCD LED repair
Possible manifestations of defects
- SUPRA STV-LC40T900WL TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
In this case, the main power supply, the AC / DC voltage converter, may be faulty, the elements of which in this model are located on the main board MainBoard TP.SIS231.PT71. It is necessary to measure its output voltages, and if they are absent (full or partial), the serviceability of the power switches (TO-220) of the converters and rectifier diodes should be checked for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in short-circuit mode, and in case of short-circuit in the elements of the primary circuit, the mains fuse usually breaks.
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 a PWM regulator, in frequency-setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) OB2276 are usually checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
In some of these cases, the malfunction is caused by the lack of display backlighting. 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.
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 TV does not turn on, the indicator signals standby or operating mode, or blinks.
Repair or diagnostics of the TP.SIS231.PT71 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: SIS231, SPI Flash 25Q64, NT5CB64M16FP, AUDIO: TPA3110LD2 with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
Owners of the STV-LC40T900WL TV are advised to contact only qualified specialists with the necessary experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC40T900WL, Main: TP.SIS231.PT71, Panel: 720p HD, 1366x768
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC40T900WL V1N07, Main: TP.SIS231.PT71, Panel: V390HJ5
The appearance of the MainBoard TP.SIS231.PT71 is shown in the figure below:TP.SIS231.PT71
TP.SIS231.PT71 can be used in TVs:
Haier LE40B7000C (Panel V390HJ1-PE1), HAIER LE39B7000C (Panel T390XVN01.0 ), SUPRA STV-LC32T500WL (Panel LC320TU3A), SUPRA STV-LC40T900WL (Panel 720p HD 1366x768).
Main features of SUPRA STV-LC40T900WL device:
Installed matrix (LED panel) V390HJ5.
To power the backlight LEDs, a converter combined with the TP.SIS231.PT71 main board is used, 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 OB2276 microcircuits and TO-220 power switches.
MainBoard - the main board (motherboard) is a TP.SIS231.PT71 module, using CPU chips: SIS231, SPI Flash 25Q64, NT5CB64M16FP, AUDIO: TPA3110LD2 and others.
SUPRA LED TV STV-LC40T900WL with LCD V390HJ5, diagonal 40 "(102 cm) 16: 9. The required brightness of the screen of 300 cd / m2 is provided by LED backlighting. Dynamic contrast ratio of 100,000: 1 is achieved by special control of LED operation depending on the illumination of the 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, films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic resolution 720p (HD Ready). high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC.Graphic processing and digital signal shaping occurs in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards.Supported multimedia file formats: MP3, WMA, MPEG4, MKV, JPEG ...
Speaker power 16 W (2x10 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, audio x2, component, SCART, VGA, HDMI x3, USB. 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, 1024x768, 1360x768. The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: 972x604x156 mm.
Attention! SUPRA STV-LC40T900WL LED TV panel V390HJ5 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.