Technical description and composition of the PANASONIC TX-R32LE8KS TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-R32LE8KS
Chassis / Version: LH80
Panel: LTA320AA03
Lamp backlight: CCFL
T-CON: 320AA03C2LV0.0
Inverter (backlight): INV32S12M REV0.5 INV32S12J
Power Supply (PSU): TNP4G433 AM 4
PWM Power: FA5501AN, TUC4GJ5007
MOSFET Power: B1DFBR000008
MainBoard: TNP4G431 BQ
IC MainBoard: EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448
Tuner: ENG39E04GF
Control: IR: TNP4G448
Appearance
PANASONIC TX-R32LE8KS
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- The PANASONIC TX-R32LE8KS 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 such cases, you should start looking for a fault in the circuits of the TNP4G433 power supply. Its output voltages should be measured and, in their absence, the serviceability of the power switches (B1DFBR000008) and rectifier diodes in the converters should be checked for possible breakdown.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key is often cut off.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying a PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) FA5501AN, TUC4GJ5007, in the absence of external damage and short circuit between the terminals, are checked by replacing them with a known good one.
- 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 immediately disappear.
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 participate in the power supply of the inverter, the power switches in its converter should be ringed for breakdown and the secondary windings of the transformers for an open circuit.
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 turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the TNP4G431 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). Often the MB (SSB) board needs to be replaced in the event of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448 and replace the failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.If there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as that the supply voltages on the ENG39E04GF tuner terminals are in line. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
Once again, we remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repairs to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-R32LE8 Chassis LH80
MainBoard TNP4G431 is shown in the figure below:TNP4G431
External view of the power supply
The main features of the PANASONIC TX-R32LE8KS device:
Installed matrix (LCD-panel) LTA320AA03.
Matrix control uses Timing Controller (T-CON) 320AA03C2LV0.0.
An INV32S12M inverter is used to power the backlight lamps.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-R32LE8KS TV is carried out by the TNP4G433 power module, or its analogs using FA5501AN, TUC4GJ5007 microcircuits and B1DFBR000008 power switches.
MainBoard - the main board (motherboard) is a TNP4G431 module, using chips EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448 and others.
The ENG39E04GF tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AA03
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Brightness: 500 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: CCFL
Signal Interface: LVDS (1 ch, 8-bit)
Voltage: 12.0V