Technical description and composition of the TV SHIVAKI STV-50LED13, type of panel and applicable modules. The composition of the modules.SHIVAKI LED
Model: STV-50LED13
Chassis / Version: TP.S512.PC821
Panel: V500HJ1-PE8
LED driver (backlight): integrated into MainBoard
PWM LED driver: LD7750
MOSFET LED driver: 80R900P
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1607, LD5530, LD7750 (LED-DRV)
MOSFET Power: 70R900P (Stb), MDF13N50B (PFC)
MainBoard: TP.S512.PC821
IC MainBoard: S2T512, W25Q64BV, TPA3110D2, 1117
Tuner: R840 & XF-3SDT-H T3 / 1 R 1/613
Technical Specifications STV-50LED13W
SHIVAKI STV-50LED13
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The SHIVAKI STV-50LED13 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
First of all, in such cases, you should verify the operability of the common switching power supply (IIP) - AC / DC voltage converter of the mains voltage. All source elements, including the PFC circuit and LED drivers in this TV model are located on the MainBoard TP.S512.PC821 main board. It is necessary to measure all the output voltages of the source, and if they are absent, you should check the power switches and rectifier diodes of the converters for a short circuit probability.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the mains fuse and, less often, the current sensor at the source of the key are most often cut off.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM circuits NCP1607, LD5530, LD7750 are usually checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
As a rule, in such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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 to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, it does not respond to the remote control.
Repair or diagnostics of the TP.S512.PC821 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard board - S2T512, W25Q64BV, TPA3110D2. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
The malfunction of the tuner R840 - XF-3SDT-H, T3 / 1 R 1/613 is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention! For users and owners of STV-50LED13 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-serviceability of the device.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MainBoard TP.S512.PC821
FIRMWARE FOR SPI FLASH -----------> SHIVAKI STV-50LED13, Main: TP.S512.PC821, Panel: V500HJ1-PE8
The appearance of MainBoard TP.S512.PC821 is shown in the figure below:TP.S512.PC821
TP.S512.PC821 can be used in TVs:
AKAI LEA-49K40M (Panel LSC490HN04-W), DEXP F48B7000V (Panel LCS480HN07), SHIVAKI STV-48LED15 (Panel LSC480HN05-B01), SHIVAKI STV-49LED17 (Panel LSC490HN03-W), SHIVAKI STV-50LED13 (Panel V500HJ1-PE8), THOMSON T48D16SF-01B (Panel LVF480SSDX E8 V1).
Main features of the SHIVAKI STV-50LED13 device:
Installed matrix (LED-panel) V500HJ1-PE8.
To power the backlight LEDs, a converter is used, combined with the TP.S512.PC821 main board, controlled by the LD7750 PWM controller. As the power elements of the LED driver, keys of the 80R900P type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using NCP1607, LD5530, LD7750 (LED-DRV) microcircuits and power switches of the type 70R900P (Stb), MDF13N50B (PFC).
MainBoard - the main board (motherboard) is a module TP.S512.PC821, using chips S2T512, W25Q64BV, TPA3110D2, 1117 and others.
The tuner R840 & XF-3SDT-H T3 / 1 R 1/613 provides the reception of television programs and tuning to channels.
TV SHIVAKI STV-50LED13W with LCD display V500HJ1-PE8, diagonal size 50 "(127 cm) 16: 9 format. The required brightness of the screen 350 cd / m² is provided by LED backlight LED. Dynamic contrast ratio 5000: 1 is achieved by special control of the LEDs The LED panel of this TV has end-face LED illumination - Edge LED.The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD). The high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080p. Supported media file formats: MP3, WMA, MPEG4, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, VGA, HDMI x3, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1920x1080.
The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
Overall dimensions: 1128x693x192 mm.
TV Weight: 15 kg.
Attention! The SHIVAKI STV-50LED13W LED TV panel V500HJ1-PE8 is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.
