Technical description and composition of the TV SHIVAKI STV-49LED17, type of panel and applicable modules. The composition of the modules.SHIVAKI LED
Model: STV-49LED17
Chassis / Version: TP.S512.PC821
Panel: LSC490HN03-W
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1607, LD5530, LD7750
MainBoard: TP.S512.PC821
IC MainBoard: S2T512, GD25Q64BSIG, TPA3110D2
Tuner: R840 & XF-3SDT-H T3 / 1 R 1/613
Appearance
SHIVAKI STV-49LED17
General repair guidelines for TV LCD LED
Possible malfunctions
- The SHIVAKI STV-49LED17 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
The malfunction in such cases should be sought in the elements of the power source - the network voltage converter (AC / DC), which is located on the MainBoard TP.S512.PC821 main board together with the PFC converters and the LED driver. It is necessary to measure the output supply voltage of the converters, and in case of their absence, check the serviceability of their power switches and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) NCP1607, LD5530, LD7750, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To check the LED lines for breaks 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.
- The indicator blinks or lights constantly, the TV does not turn on, 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). In cases of attempts to repair the MB board (SSB), it is necessary to check the health of its elements - S2T512, GD25Q64BSIG, TPA3110D2 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If the TV works normally with external devices, but does not tune into television channels, the tuner R840 Tuner-XF-3SDT-H, T3 / 1 R 1/613 may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention! For users and owners of STV-49LED17 TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against 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-49LED17, Main: TP.S512.PC821, Panel: LSC490HN03-W
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-49LED17 device:
Installed matrix (LED panel) LSC490HN03-W.
To power the backlight LEDs, a converter is used, combined with the main board TP.S512.PC821.
The power module is combined with the MainBoard and is designed according to a flyback AC / DC voltage converter using NCP1607, LD5530, LD7750 microcircuits.
MainBoard - the main board (motherboard) is a module TP.S512.PC821, using microchips S2T512, GD25Q64BSIG, TPA3110D2 and others.
The tuner R840 & XF-3SDT-H T3 / 1 R 1/613 provides the reception of television programs and tuning to channels.