Technical description and composition of the SUPRA STV-LC32800WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32800WL
Chassis / Version: T.MS18VG.72B
Panel: HK315WLEDM-BHA4A
LED backlight: HKC-315-3T 22S2P
LED driver (backlight): integrated into PSU
PWM LED driver: OB3362RP
MOSFET LED driver: AOD4454
Power Supply (PSU): HKC-PL05 REV: 1.0 - 20120510
PWM Power: NE1101B
MainBoard: T.MS18VG.72B
IC MainBoard: Flash GD25Q32B
Tuner: CDT-3SP5i2-36
Control: IR: 6003120090, 19-42V3-IR-V2.0
STV-LC32800WL Specifications
SUPRA STV-LC32800WL
General recommendations for TV LCD LED repair
SUPRA STV-LC32800WL TV, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before starting the necessary measurements. In some cases, defective elements are visible with the naked eye, for example, charred resistors or swollen sintered capacitors, or electrolytic ones in rectifier filters. The formed ring cracks in the soldering of the terminals of transformers or heating circuit elements are also frequent sources of many malfunctions with a variety of external manifestations.
Sometimes the SUPRA STV-LC32800WL 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 likely cause of a malfunction is the failure of the common power module. If it is working properly, you need to check the processor batteries on the SSB (Main Board). 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 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.
In cases where the SUPRA STV-LC32800WL TV has lost the image, but there is sound and all other functions are operational, there is a possibility of a malfunction of the LED driver (the converter for powering the backlight LEDs of the HK315WL panel). When you turn on the TV, the image may appear briefly and immediately disappear. It should be borne in mind that with such manifestations, the LEDs themselves fail.
Often, in the absence of backlighting, 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.
It should be remembered that it is not possible to determine an open circuit in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or microcircuit power converters and, if necessary, update the software (software).
In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its Flash GD25Q32B chips and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
Before replacing the CDT-3SP5i2-36 tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals.
Remember! Attempts to self-repair the SUPRA STV-LC32800WL TV by users without appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC32800WL, Main: T.MS18VG.72B, Panel: HK315WL
To reduce the backlight current in LED drivers with OB3362RP (TSOP16) controller, increase the total resistance of the resistors from pin 5 (ISET) to the case. The maximum current in each of the four channels (in milliamperes) for the resistor Rset (in kilo-ohms) is determined from the ratio 3000 * 1.2V / Rset.
Additional MainBoard Repair
The appearance of the MainBoard T.MS18VG.72B is shown in the figure below:
T.MS18VG.72B
T.MS18VG.72B can be used in TVs:
SUPRA STV-LC42790FL (Panel HK420LEDM-AH17H), SUPRA STV-LC32800WL (Panel HK315WLEDM-BHA4A).
External view of the power supply
Main features of SUPRA STV-LC32800WL device:
Installed matrix (LED panel) HK315WLEDM-BHA4A.
A converter combined with a power supply is used to power the backlight LEDs, and is controlled by the OB3362RP PWM controller. The keys of the AOD4454 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC32800WL TV is carried out by the HKC-PL05 power module, or its analogues using NE1101B microcircuits.
MainBoard - the main board (motherboard) is a T.MS18VG.72B module, using Flash GD25Q32B chips and others.
The CDT-3SP5i2-36 tuner provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC32800WL with LCD HK315WLEDM-BHA4A, 32 "(81 cm) 16: 9. The required screen brightness of 450 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 backlight 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, MPEG4, DivX, MKV , JPEG.
Speaker power 12 W (2x6 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, RGB, 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, 1280x1024, 1360x768.
The power consumed by the TV in operating mode from the network is 65 W.
Overall dimensions: 736x502x205 mm.
TV weight: 7.28 kg.
Attention! Panel HK315WLEDM-BHA4A LED TV SUPRA STV-LC32800WL 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.