Technical description and composition of the SUPRA STV-LC50ST900FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC50ST900FL
Chassis / Version: V1N07
Panel: HK500WLEDM-AHA7H
LED backlight: 3BL-T5454102-L02B, 3BL-T4754102-R02B
T-CON: 46T21-C0A T460HVN05.3 CTRL BD
LED driver (backlight): integrated into PSU
PWM LED driver: OB3362RP
Power Supply (PSU): HKC-500201 D 401-2K201-D4211
PWM Power: NE1101B
MainBoard: ST6369IV-E1C
IC MainBoard: DRAM: K4B4G1646B-HCK0; NAND Flash: THGBM5G5A1JBAIR; SPI Flash: 25Q32, 25Q80
Control: IR: 60030101171 39B7 SANYO IR PCB
STV-LC50ST900FL Specifications
SUPRA STV-LC50ST900FL
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- SUPRA STV-LC50ST900FL TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up or flash.
With such manifestations, the HKC-500201 power supply module usually fails. It is necessary to measure the output voltages in its secondary circuits, and in the event of their complete absence, the serviceability of the power switches and rectifier diodes should be checked for a possible breakdown (short circuit).
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in a short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) NE1101B, if they have no visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
Usually, in such cases, a malfunction is detected in the nodes of the LED panel backlight. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
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.
- TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the ST6369IV-E1C motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace 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 DRAM chips: K4B4G1646B-HCK0; NAND Flash: THGBM5G5A1JBAIR; SPI Flash: 25Q32, 25Q80 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 TV owners! Attempts to repair SUPRA STV-LC50ST900FL yourself are not recommended by the manufacturer and can lead to serious negative consequences!
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 kilohms) is determined from the ratio 3000 * 1.2V / Rset.
The appearance of the MainBoard ST6369IV-E1C is shown in the figure below:ST6369IV-E1C
ST6369IV-E1C can be used in TVs:
SUPRA STV-LC50ST900FL (Panel HK500WLEDM-AHA7H), SUPRA STV-LC40ST900FL (Panel V400HJ6-PE1).
External view of the power supply
Main features of SUPRA STV-LC50ST900FL device:
Installed matrix (LED panel) HK500WLEDM-AHA7H.
Matrix control uses the 46T21-C0A Timing Controller (T-CON).
A converter combined with a power supply is used to power the backlight LEDs, and is controlled by the OB3362RP PWM controller.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC50ST900FL TV is carried out by the HKC-500201 power module, or its analogs using NE1101B microcircuits.
MainBoard - the main board (motherboard) is an ST6369IV-E1C module, using DRAM chips: K4B4G1646B-HCK0; NAND Flash: THGBM5G5A1JBAIR; SPI Flash: 25Q32, 25Q80 and others.
SUPRA LED TV STV-LC50ST900FL with LCD HK500WLEDM-AHA7H, diagonal size 50 "(127 cm) 16: 9. The required screen brightness of 400 cd / m² is provided by LED backlight. Dynamic contrast ratio of 150,000: 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.The TV capabilities provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution in 1080p (Full HD ).
STV-LC50ST900FL has built-in SMART software and pre-installed Android Operating System. Internet connection can be made via Wi-Fi wireless connection. The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping takes place in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power 12 W (2x6 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x4, USB x3, Ethernet (RJ-45), Wi-Fi. 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, 1920x1080. The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: With stand 1153x686x250 mm, Without stand 1153x654x71 mm.
TV weight: 13.4 kg.
Attention! Panel HK500WLEDM-AHA7H LED TV SUPRA STV-LC50ST900FL 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.