Technical description and composition of the SUPRA STV-LC32950WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32950WL
Chassis / Version: V1L10
Panel: HV320WX2-201
LED backlight: YP 37020575 2 * 36 led
Power Supply (PSU): Integrated
MainBoard: 35017068 REV-01 KL29CT616
IC MainBoard: CPU: MT8227AAKU (BMSL), SPI FLASH: W25Q32
Tuner: Integrated
Control: Login to the service: MENU 2008
STV-LC32950WL Specifications
SUPRA STV-LC32950WL
General recommendations for TV LCD LED repair
SUPRA STV-LC32950WL, like other TVs, it is advisable to start repairing with a careful examination of the external and internal elements and modules. In some cases, visible external damage to elements can suggest directions for troubleshooting and localization of a defect even before the necessary measurements are taken at the control points of electronic circuits. 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 to guess the causes and possible consequences of the malfunction.
Sometimes the SUPRA STV-LC32950WL TV just won't turn on. No control lamps on the front panel are on or blinking, the TV does not respond to the remote control and does not emit any sounds or any signs of life when turned on. The most probable cause of the failure is the failure of the common power supply module Integrated. If it is working properly, you need to check the processor batteries on the SSB (Main Board). When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the secondary rectifier filter and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes and transistors in the primary circuit.
It should be remembered that in the practice of repair, usually power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the reason that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dry electrolytic capacitors or broken resistors in the primary circuit, or the PWM controller microcircuit itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If, when turning on the TV, the image appears and immediately disappears, or is absent initially when turned on, but there is sound and other functions work, there is a high probability of a malfunction of the LED driver (power converter for the backlight LEDs of the HV320WX2-201 panel). In such cases, the common power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
It is often necessary to disassemble the panel to check the health of the LEDs, as well as the contact connections in the connectors and solders.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes.
Repair of the motherboard 35017068 REV-01 must begin with diagnostics and testing of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
In some cases, check or replace (if necessary) elements of the MB (SSB) board - CPU: MT8227AAKU (BMSL), SPI FLASH: W25Q32. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
If you suspect a malfunction of the Integrated tuner, first of all, you need to make sure that there is a supply voltage of the varicaps (30-33V) at the corresponding output of the tuner, as well as other voltages supplying it.
Attention! Users and owners of STV-LC32950WL TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC32950WL (V1L10), Main 35017068 REV-01, Panel: HV320WX2-201
In case of malfunctions in the SPI FLASH software produced by Winbond, we recommend changing the microcircuit itself to a new one. Sometimes Winbond microcircuits can recover for a while after high-temperature exposure, for example, warming up with a soldering station or a lighter, which is sometimes enough to read its contents.
Additional MainBoard RepairThe appearance of MainBoard 35017068 is shown in the figure below:
35017068
35017068 can be used in TVs:
FUSION FLTV-32L24B (Panel HV320WX2-201), SUPRA STV-LC32950WL (Panel HV320WX2-201).
Main features of SUPRA STV-LC32950WL device:
Installed matrix (LED-panel) HV320WX2-201.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC32950WL TV is carried out by the Integrated power module, or its analogs.
MainBoard - the main board (motherboard) is a 35017068 module, using CPU chips: MT8227AAKU (BMSL), SPI FLASH: W25Q32 and others.
Tuner Integrated provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: BOE
Model: HV320WX2-201
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: AFFS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 6.6% (with Polarizer)
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit)
Response Time: 8 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
SUPRA LED TV STV-LC32950WL with LCD HV320WX2-201, 32 "(81 cm) 16: 9. The required brightness of the screen 320 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) The 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, 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 x3, 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: 794x530x155 mm.
TV weight: 6.2 kg.
Attention! The HV320WX2-201 panel of the SUPRA STV-LC32950WL 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 non-repairable.