Technical description and composition of the PANASONIC TX-20LA60P TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-20LA60P
Chassis / Version: SL-131PP
Panel: LC201V02-SDA3
Lamp backlight: 6 Lamp CCFL
Inverter (backlight): integrated into PSU
PWM Inverter: STR-H2003 (24 pin)
Power Supply (PSU): IPB-6015N01
PWM Power: STR-W6856
MainBoard: PTMSMSG142
IC MainBoard: TDA15521E / N1F81, 39VF020, 24C32WP
Tuner: UV1316 / A I H-4
TX-20LA60P Specifications
PANASONIC TX-20LA60P
General recommendations for TV LCD repair
Possible manifestations of defects
- Panasonic TX-20LA60P does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In such cases, the fault should be looked for first of all in the power supply module IPB-6015N01. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for possible partial or complete breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
The breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) STR-W6856, if they do not have visible damage to the case and an outright short circuit between the pins, are usually checked by replacing.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
These manifestations can be provoked by the power module, or by defects in the inverter, as well as by the skew of currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you should ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the PTMSMSG142 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Complicated repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements TDA15521E / N1F81, 39VF020, 24C32WP. Malfunctions in BGA chips are usually easy to detect by warm-up.
Before replacing the UV1316 / A I H-4 tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. You also need to make sure that the tuner and processor can exchange data via the I2C bus
Attention! Users and owners of TX-20LA60P TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that may lead to the complete non-repairability of the device.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Panasonic TX-20LA60P Chassis SL-131PP for models. TX-20LA60F, TX-20LA60P, TX-20LA6F, TX-20LA6P
The appearance of the MainBoard PTMSMSG142 is shown in the figure below:PTMSMSG142
External view of the power supply
The main features of the PANASONIC TX-20LA60P device:
Installed matrix (LCD panel) LC201V02-SDA3.
To power the backlight lamps, a converter combined with a power supply is used, controlled by the STR-H2003 PWM controller (24 pin).
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-20LA60P TV is carried out by the IPB-6015N01 power module, or its analogs using STR-W6856 microcircuits.
MainBoard - the main board (motherboard) is a PTMSMSG142 module using TDA15521E / N1F81, 39VF020, 24C32WP and others.
The UV1316 / A I H-4 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC201V02-SDA3
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 800: 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
PANASONIC TX-20LA60P TV with LCD display LC201V02-SDA3, diagonal size 20 "format 4: 3. The input analog video signal can be processed in PAL, SECAM, NTSC systems. Graphic processing and image formation of the digital signal occurs in the 480i, 480p standards , 576i.
The power of the acoustic audio system is 4 W (2x2 W), provided by two speakers. NICAM STEREO sound processing system is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, S-Video, SCART, RGB. A headphone output is provided for individual listening.
Dimensions: with stand 498x493x260 mm, without stand 498x451x95 mm.
TV weight: without stand: 10.9 kg.
Attention! The LC201V02-SDA3 panel of the PANASONIC TX-20LA60P LCD TV is a rather expensive component.
Avoid impacts on glass and pressure on the surface of the screen to avoid irreversible damage to the LCD panel!