Technical description and composition of the SUPRA STV-LC32790WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32790WL
Chassis / Version: T.VST59.A5
Panel: HK315LEDM-HHU9H
LED driver (backlight): integrated into PSU
PWM LED driver: OB3362RP
MOSFET LED driver: QM3014D, ME12P04
Power Supply (PSU): HKL-320401
PWM Power: LD7537R
MOSFET Power: ME15N10-G
MainBoard: CV59SH-J
IC MainBoard: CPU: TSUMV59XUS-Z1; SPI Flash: GD25Q32BSIG; SOUND: TPA3110D2
Tuner: CDT-3NP5I2-10
STV-LC32790WL Specifications
SUPRA STV-LC32790WL
General recommendations for TV LCD LED repair
SUPRA STV-LC32790WL, like other TVs, it is advisable to start repairing with a close examination of the external and internal elements and modules. According to some external signs of a change in the state of some elements, sometimes it becomes possible to make assumptions about the nature of the defect, as well as to determine the further direction of troubleshooting. Charred paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering on the leads of heating elements or transformers can often suggest the causes of the defect and possible consequences.
Sometimes the SUPRA STV-LC32790WL 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). 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.
In most cases, breakdowns of keys in switching power supplies (SMPS) do not occur without reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as broken resistors or punctured semiconductor elements in the stabilization circuits. Possible defect of the PWM chip from the manufacturer.
If, when you turn 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 (the power converter for the panel backlight LEDs HK315LEDM-BH81H (HV320WX2-261)). 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.
To check the health of the LEDs and contact connections in their power supply circuit, it is necessary to disassemble the panel.
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.
Repair or diagnostics of the motherboard T.MS18VG.72 (T.VST59.A5) should start with checking the stabilizers or power converters of its microcircuits. If necessary, you should 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 CPU: TSUMV59XU-Z1, FLASH: 25Q32 chips and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
Attention to the owners! Attempts to repair the SUPRA STV-LC32790WL TV yourself are not recommended by the manufacturer and can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> Supra STV-LC32790WL MAIN T.MS18VG.72, PANEL HK315LEDM-BH81H
If the SPI FLASH Winbond software fails, we recommend replacing the microcircuit with a new one. In addition, faulty Winbond microcircuits can sometimes recover for a while after warming up with a soldering station or even a lighter, which is enough to read its standard contents.
Additional MainBoard RepairThe MainBoard CV59SH-J is shown in the figure below:
CV59SH-J
Main features of SUPRA STV-LC32790WL device:
Installed matrix (LED panel) HK315LEDM-HHU9H.
A converter combined with a power supply is used to power the backlight LEDs, and is controlled by the OB3362RP PWM controller. QM3014D, ME12P04 keys are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC32790WL TV is carried out by the HKL-320401 power module, or its analogues using LD7537R microcircuits and ME15N10-G power switches.
MainBoard - the main board (motherboard) is a CV59SH-J module, using CPU chips: TSUMV59XUS-Z1; SPI Flash: GD25Q32BSIG; SOUND: TPA3110D2 and others.
The CDT-3NP5I2-10 tuner provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC32790WL with LCD display HK315LEDM-BH81H (HV320WX2-261), diagonal size 32 "(81 cm) 16: 9 format. The required brightness of the screen 450 cd / m² is provided by LED backlighting. Dynamic contrast 80,000 : 1 is achieved by special control of the LEDs depending on the illumination of the 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, films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic decomposition 720p (HD Ready) Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC Graphics processing and digital signal shaping occurs in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported media file formats: MP3, WMA, 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 x3, component, SCART, 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.
The power consumed by the TV in operating mode from the network is 65 W.
Dimensions: With stand 735x495x190 mm, Without stand 735x450x55 mm.
Attention! Panel HK315LEDM-BH81H (HV320WX2-261) SUPRA LED TV STV-LC32790WL 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.