Technical description and composition of the SUPRA STV-LC28500WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC28500WL
Chassis / Version: TP.VST59S.PB813
Panel: ST2751A01-3
T-CON: ST2751A01-3-XC-2 ver2.2
LED driver (backlight): integrated into MainBoard
PWM LED driver: SN510P
MOSFET LED driver: ME15N10-6
Power Supply (PSU): integrated into MainBoard
PWM Power: LD7536 (6 pin)
MainBoard: TP.VST59S.PB813
IC MainBoard: CPU TSUMV59XES-Z1, Flash 25Q32
Tuner: R840
STV-LC28500WL Specifications
SUPRA STV-LC28500WL
General recommendations for TV LCD LED repair
It is advisable to carry out external examination of external and internal elements in a timely manner before the start of operations for their dismantling. Sometimes, based on the visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements begin. Elements with visible damage, for example, capacitors swollen after electrolyte boiling, charred resistors in certain nodes of the circuit, as well as ring cracks in the solders, will help the master guess the causes and possible consequences of the malfunction.
In cases where the SUPRA STV-LC28500WL TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light or blink, and there are no sounds and no signs of operation when turned on, the power module is most likely faulty or there is no power processor on the motherboard (typical defect of some SUPRA TV models). In general, first of all, it is necessary to check the electrolytic capacitors of the filters of the secondary rectifiers and the fuse at the mains input. If it is cut off, then the diodes of the rectifier bridge and the key transistor of the converter, which can be located either on a separate heatsink or integrated with a PWM controller into a common microcircuit, should be checked for a breakdown of PN junctions. Options are possible.
It should be borne in mind that in the practice of repair, it is extremely rare for key transistors in switching power supplies (SMPS) to fail without reasons that should be looked for by checking other components, for example, a key breakdown can provoke faulty elements of damper circuits, or dried electrolytic capacitors or broken primary resistors power supply circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM regulator microcircuit are subject to verification, which it is desirable to check by replacement.
If SUPRA STV-LC28500WL has no picture, but there is sound and the TV is controlled from the remote control, a malfunction is likely in the backlight circuits of the ST2751A01-3 panel. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when the TV is turned on, an image appears and immediately disappears. First of all, you need to make sure that the electrolytic capacitors of the rectifier filter supplying the LED driver are in good working order, and check the LEDs by connecting those that are known to be working for diagnostics.
Often, in the absence of backlight, disassembly of the panel is required. It is necessary to check the serviceability of the LED transitions, as well as the reliability of the contact connections in the lines and connectors.
When trying to detect a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
In cases of attempts to repair the TP.VST59S.PB813 motherboard, it is necessary to check the operation of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). BGA chips can in most cases be diagnosed by local heating.
In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - CPU TSUMV59XES-Z1, Flash 25Q32 which may need to be replaced with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its pins with the board (indicated by warming up).
Attention to the owners! Attempts to repair the SUPRA STV-LC28500WL TV yourself are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Service manual and sсhematic diagram TP.VST59S.PB813
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC28500WL, Main: TP.VST 59S.PB813, Panel: ST2751A01-3
The appearance of the MainBoard TP.VST59S.PB813 is shown in the figure below:TP.VST59S.PB813
The TP.VST59S.PB813 motherboard is combined with a power supply module and is an independent device based on the TSUMV59Xxx multifunctional processor. Repair of such a board must begin with checking the power supply elements, as well as the operability of voltage converters and linear stabilizers required to supply power to certain processor nodes, in particular: core power supply + 1.2V, built-in DDR + 1.8V memory and stand-by mode node by 3.3V. The supply voltage of the LCD panel is 5V or 12V, depending on the type of panel used, it is necessary to check directly on the LVDS connector.
TP.VST59S.PB813 can be used in TVs:
MYSTERY MTV-3217LW (Panel CX315DLEDM), SHIVAKI STV-32LED6 (Panel HV320WX2-206), SUPRA STV-LC28500WL (Panel ST2751A01-3), TELEFUNKEN TF-LED32S2 (Panel LSC320AN02), TELEFUNKEN TF-LED39S11 (Panel T390HVN04.2 E39-9100).
Main features of SUPRA STV-LC28500WL device:
Installed matrix (LED panel) ST2751A01-3.
Matrix control uses Timing Controller (T-CON) ST2751A01-3-XC-2.
To power the backlight LEDs, a converter combined with the TP.VST59S.PB813 main board is used, controlled by the SN510P PWM controller. The keys of the ME15N10-6 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 LD7536 microcircuits (6 pin).
MainBoard - the main board (motherboard) is a TP.VST59S.PB813 module, using CPU TSUMV59XES-Z1, Flash 25Q32 and others.
The R840 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CSOT
Model: ST2751A01-3
Type: a-Si TFT-LCD, CELL
Diagonal size: 27.5 inch
Resolution: 1366x768, WXGA
Display Mode: HVA, Normally Black, Transmissive
Active Area: 607.528x345.024 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 7.2% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 62%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
SUPRA LED TV STV-LC28500WL with LCD ST2751A01-3, 28 "(71 cm) 16: 9 diagonal. 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) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, 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, audio x2, component, VGA, HDMI x2, USB. 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.
Overall dimensions: 610x445x195 mm.
Attention! The ST2751A01-3 panel of the SUPRA STV-LC28500WL LED TV 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 unrepairable.