Technical description and composition of the PANASONIC TX-20LA6P TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-20LA6P
Chassis / Version: SL-131PP
Panel: LC201V02 (SD) (A3)
Lamp backlight: 6 Lamp CCFL
Inverter (backlight): integrated into PSU
Trans Inverter: EFD1221B
Power Supply (PSU): IPB-6015N01
PWM Power: SRTW6253
MainBoard: PTMSMSG142 48598014193-01
IC MainBoard: CPU: TDA15521E / N1F81, FLASH: 39VF020
Tuner: UV1316 / A I H-4
Control: IR: PTLEMSG142
TX-20LA6P Specifications
PANASONIC TX-20LA6P
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- The PANASONIC TX-20LA6P TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
In some of these cases, the main switching power supply, the IPB-6015N01 module, turns out to be faulty. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches and rectifier diodes of the converters for a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short-circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and, less often, the current sensor in the source of the key.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) SRTW6253 are usually checked by replacing them with new ones, or knowingly working.
- There is no image, there is sound, it reacts to the remote control. Or the image may appear for a second when turned on and disappear immediately.
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. If all the electrolytic capacitors of the filter for the power supply of the inverter are in good working order, you should make sure that the lamps are in good condition, then you need to check the keys of the converter and the secondary windings of the transformers.
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 TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
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). If it is not possible to replace the MB (SSB) board, it is necessary to check the serviceability of its elements - CPU: TDA15521E / N1F81, FLASH: 39VF020. Defective components must be replaced.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the UV1316 / A I H-4 tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Attention to users! Self-repair of the PANASONIC TX-20LA6P TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ----------------> Chassis SL-131PP TX-20LA60F, TX-20LA60P, TX-20LA6F, TX-20LA6P
Additional MainBoard RepairThe appearance of the MainBoard PTMSMSG142 is shown in the figure below:
PTMSMSG142
External view of the power supply
Main features of the PANASONIC TX-20LA6P device:
Installed matrix (LCD panel) LC201V02 (SD) (A3).A converter combined with a power supply is used to power the backlight lamps. An EFD1221B transformer is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-20LA6P TV is carried out by the IPB-6015N01 power module, or its analogs using SRTW6253 microcircuits.
MainBoard - the main board (motherboard) is a PTMSMSG142 module, using CPU chips: TDA15521E / N1F81, FLASH: 39VF020 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
TV PANASONIC TX-20LA6P with LCD display LC201V02, 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 standards 480i, 480p, 576i ...
The power of the acoustic audio system is 4 W (2x2 W), provided by two speakers. NICAM STEREO sound processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, RGB. A headphone output is provided for individual listening.
Dimensions: with stand 498x493x260 mm, without stand 498x451x95 mm.
TV weight: without stand: 10.2 kg.
Attention! The LC201V02 (SD) (A3) panel of the PANASONIC TX-20LA6P 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!