Technical description and composition of the TV SHIVAKI STV-20L1, type of panel and applicable modules. The composition of the modules.SHIVAKI
Model: STV-20L1
Chassis / Version: JUJ7.820.135
Panel: LC201V02 (A3) (KB)
Lamp backlight: 6 CCFL
T-CON: LC201V02-A3KA - 6870S-0060J; HS553125B, BUF11702, T1451A, LCX74
Inverter (backlight): 1NV20-606A (D)
PWM Inverter: BIT3106G
MOSFET Inverter: AO4600
Power Supply (PSU): FSP084-1CD02 3BS0084311
PWM Power: NCP1207, TDA4863G (PFC)
MOSFET Power: 07N60C3, 13N50C
MainBoard: JUJ7.820.135
IC MainBoard: MST518, TDA15063H / N1B00, 24LC32A, TDA9178T, PT2338-X, LVC126A, 14016B, TDA1308
Tuner: TAF5-C2IP1RW
Appearance
SHIVAKI STV-20L1
General recommendations for repairing TV LCD
Repair of the TV SHIVAKI STV-20L1 should begin with the diagnosis of a malfunction, which involves a careful examination of the external and internal elements of the device. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the soldered terminals of transformers or heating elements are detected, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
In the case when the STV-20L1 does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, the power supply module FSP084-1CD02 3BS0084311 is probably faulty in this case. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Options are 07N60C3, 13N50C.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM regulator chip NCP1207, TDA4863G, which it is desirable to check by replacement, are subject to verification.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the inverter should be checked. It is necessary to take into account that in cases of inverter protection shutdown (in order to be able to diagnose) there is a risk of failure of the inverter power elements and take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
On the JUJ7.820.135 motherboard, in case of a malfunction, you should first check the performance of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - MST518, TDA15063H / N1B00, 24LC32A, TDA9178T, PT2338-X, LVC126A, 14016B, TDA1308 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).
The malfunction of the TAF5-C2IP1RW tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Owners and users of the SHIVAKI STV-20L1 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
The appearance of the MainBoard JUJ7.820.135 is shown in the figure below:JUJ7.820.135
PSU Advanced
The FSP084-1CD02 power module is installed in the STV-20L1 TV using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the TDA4863G PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current determines its reactance (of the order of 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
Main features of the SHIVAKI STV-20L1 device:
Installed matrix (LCD panel) LC201V02 (A3) (KB).
The matrix control uses the Timing Controller (T-CON) LC201V02-A3KA.
To power the backlight, an inverter 1NV20-606A (D) is used, it is controlled by the BIT3106G PWM controller. As power elements of the inverter, keys of the AO4600 type are used.
The necessary supply voltages for all nodes of the SHIVAKI STV-20L1 television are generated by the FSP084-1CD02 power supply module or its analogs using NCP1207, TDA4863G (PFC) microcircuits and power switches of the 07N60C3, 13N50C type.
MainBoard - the main board (motherboard) is a JUJ7.820.135 module, using the MST518, TDA15063H / N1B00, 24LC32A, TDA9178T, PT2338-X, LVC126A, 14016B, TDA1308 and other chips.
The TAF5-C2IP1RW tuner provides TV reception and channel tuning.
Information from an alternative source:
SHIVAKI STV-20L1
Panel Type (Matrix): LC201V02 (A3) (KB)
Motherboard: JUJ7.820.135, MST518, TDA15063H / N1B00, 24LC32A, 24LC21A, TDA9178T, PT2338-X x2, LVC126A, 14016B, TDA1308, Tuner: TAF5-C2IP1RW,
T-con: LC201V02-A3KA P / N: 6870S-0060J, HS553125B, BUF11702, T1451A, LCX74
Invertor: 1NV20-606A (D), BIT3106G, AO4600 x4
PSU: FSP084-1CD02 3BS0084311, NCP1207, TDA4863G, 07N60C3, 13N50C
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC201V02-A3KB
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 350: 1
Display Colors: 16.7M (8-bit)
Response Time: 12/13 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: CMOS (1 ch, 8-bit), 41 pins
Voltage: 12.0V
