Technical description and composition of the TV SONY KLV-20SR3, type of panel and applicable modules. The composition of the modules.SONY
Model: KLV-20SR3
Chassis / Version: WA1
Panel: V296W1-L15
T-CON: V201V2-T01-C - REV: X3 - 35-A20C0311
Inverter (backlight): IV85290 - 1-761-944-13 - JP050713B (6lamp)
PWM Inverter: OZ967SN (pl 28n)
MOSFET Inverter: 3010 5C2 (8N PL)
Power Supply (PSU): 1-863-280-13 S8001481A
MainBoard: 1-863-275-17 - 1-724-775-17 - I8001482A
Technical Specifications KLV-20SR3
SONY KLV-20SR3
General recommendations for repairing TV LCD
Diagnostics of the malfunction of the TV SONY KLV-20SR3, like all others, it is advisable to start with an external examination of possible changes, both external and internal elements. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the WK541 S8001481A power supply module is faulty and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. If it is torn, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the converter, which are often found in a breakdown state in such situations.
It should be remembered that the N-FET keys used in flyback converters rarely fail for no reason that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
In cases where the SONY KLV-20SR3 TV has lost an image, and the sound is there and all 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.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
Owners and users of the SONY KLV-20SR3 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!
Service Manual with Schematic Diagram 54 pages 2004 model KLV-20SR3.
The appearance of MainBoard 1-863-275-17 is shown in the figure below:1-863-275-17
The appearance of the power supply
Main features of the device SONY KLV-20SR3:
Installed matrix (LCD panel) V296W1-L15.
The matrix control uses the Timing Controller (T-CON) V201V2-T01-C.
An IV85290 inverter is used to power the backlight lamps, it is controlled by the OZ967SN PWM controller (28n pl.). As power elements of the inverter, keys of the type 3010 5C2 (8n pl) are used.
The formation of the necessary supply voltages for all nodes of the SONY KLV-20SR3 TV is carried out by the power module 1-863-280-13, or its analogues.
MainBoard - the main board (motherboard) is a module 1-863-275-17.
Additional technical information about the panel:
Brand: CMO
Model: V296W1-L15
Type: a-Si TFT-LCD, Panel
Diagonal size: 29.5 inch
Resolution: 1280x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 643.2x385.92 mm
Lamp Type: CCFL
Brand: SONY, Model: KLV-20SR3.
Briefly from the TV: LCD, 20 ", 640x480, sound: 6 watts.
The composition uses MainBoard 1-863-275-17 and LCD-panel V296W1-L15.
Power Supply Unit (PSU) 1-863-280-13 S8001481A Power Supply.
SONY KLV-20SR3 TV with V296W1-L15 LCD, 20 "diagonal size, 4: 3 format. The brightness of the screen is 480 cd / m² with CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 400: 1. The input analog video signal can be processed in PAL, SECAM, NTSC systems.The graphic processing and image formation of the digital signal occurs in the standards 480i, 480p, 576i, 576p.
The power of a sound speaker system of 6 W (2x3 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, S-Video, SCART x2, RGB. An output for connecting headphones is provided.
Overall dimensions: with stand 504x509x250 mm, without stand 504x467x111 mm.
TV mass: with stand: 9 kg, without stand: 7 kg.
Attention! The V296W1-L15 panel of the SONY KLV-20SR3 LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!