Technical description and composition of the TV SHIVAKI STV-20L2, type of panel and applicable modules. The composition of the modules.SHIVAKI
Model: STV-20L2
Panel: HT201V01-101
Inverter (backlight): 3V0 + 94V-0 SFP2066E_Ver1.0
PWM Inverter: BIT3106A
Power Supply (PSU): Adapter SAWA-01-483 (12v 5A) or BPD0023A - DZG
PWM Power: SG6841SZ
MOSFET Power: BA6N62 (SOIC-8 = OA4606), BA7K28
MainBoard: PA-0153 2TG SHFA060213535
IC MainBoard: MSP1250G -5.0, NTDA9381C330EG, TDA8959, AN17825A, MST9141B, AN17825A, 24C16
Tuner: TDQ-6F6 / W126D
Technical Specifications STV-20L2
SHIVAKI STV-20L2
General recommendations for repairing TV LCD
Repair of the SHIVAKI STV-20L2 TV is advisable to start with an external examination of all its constituent elements, both internal electronic components and external. Inspection is also subject to body elements, control buttons, screen, connectors and cords. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
In cases when the SHIVAKI STV-20L2 TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up or blink, and there are no sounds and no signs of operability when turning on, the AC adapter SAWA power supply module is most likely to be faulty -01-483 (12v / 5A) or BPD0023A - DZG or, which is much less common, there is no processor power on the motherboard. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, the first thing to do is to check the rectifier bridge diodes and the power switch BA6N62 plan 8n (4606). BA7K28 for the probability of an avalanche or thermal breakdown.
It should be borne in mind that in the repair practice it is extremely rare that key transistors of the N-FET type fail for no reason that should be looked for by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, either dried electrolytic capacitors or dangling resistors of the primary circuit of the PSU, involved in the stabilization process. In this case, all semiconductor elements of the strapping of the BIT3106A pit PWM controller chip are subject to verification. SG6841SZ 2AO7512 (8H), which is preferably checked by replacement.
If an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
In cases where the SHIVAKI STV-20L2 TV has lost an image, and the sound is there and all the other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
When repairing the SFP2066E_Ver1.0 inverter, it is often necessary to disable the protection for diagnostics, which, for the purpose of fire safety, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during work, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
Diagnosis and repair of the motherboard SHFA060213535 is carried out by checking the performance of power stabilizers or updating the software (software).
Owners and users of the SHIVAKI STV-20L2 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences, which can lead to complete non-repairability of the device!
Repair MainBoard
The appearance of the MainBoard MSD309PV7.0-A is shown in the figure below:
MainBoard MSD309PV7.0-A uses the MSD309B processor, DDRAM random access memory (RAM) in BGA version and SPI Flash ROM type 25Q32 (4Mb).
It is advisable to start the repair of the motherboard by checking the voltage converters and linear stabilizers necessary to provide power to the nodes in the operating and standby modes. The processor core is powered by + 1.5V.
Also, the processor voltage requires + 2.5V and + 3.3V.
If the display backlight is working properly and there is no image, it is necessary to check the panel power (depending on the type, + 5V or + 12V), which is more convenient to measure directly on the LVDS connector. If, in the presence of all the supply voltages, the TV does not enter the operating mode, does not respond to the Remote Control and control buttons, you should update the SPI Flash firmware.
MSD309PV7.0-A can be used in TVs:
SHIVAKI STV-19LEDG7 (Panel LQ185T1LGN3), SHIVAKI STV-24LEDGR7 (Panel M236H1-L01), SHIVAKI STV-22LEDG8 (Panel CLAA215FA04).
Main features of the SHIVAKI STV-20L2 device:
Installed matrix (LCD panel) HT201V01-101.
To power the backlight, an inverter 3V0 + 94V-0 is used, it is controlled by the BIT3106A PWM controller.
To power all the internal components of the SHIVAKI STV-20L2 television, an external adapter type SAWA-01-483 (12v 5A) or BPD0023A - DZG is used using SG6841SZ microchips and power switches of type BA6N62 (SOIC-8 = OA4606), BA7K28.
MainBoard - the main board (motherboard) is a PA-0153 module, using microchips MSP1250G -5.0, NTDA9381C330EG, TDA8959, AN17825A, MST9141B, AN17825A, 24C16 and others.
The TDQ-6F6 / W126D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: BOE
Model: HT201V01-101
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: TN, Normally White, Transmissive
Active Area: 408x306 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 700: 1
Display Colors: 16.7M (8-bit)
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V