Technical description and composition of the PANASONIC TX-LR32U20 TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-LR32U20 TX-L32U20
Chassis / Version: KM09
Panel: AX080F072G
Inverter (backlight): integrated into PSU
PWM Inverter: STR-H7214, STR-H3475
MOSFET Inverter: B1CERG000030
Power Supply (PSU): TNP4G469 AB 2 P
PWM Power: STR-A6059 (Stb), FA5501AN (PFC), SSC9512
MOSFET Power: B1CERR000043, B1CER000060
MainBoard: TNP4G468 1 A
IC MainBoard: Nand Flash: H27U1G8F2BTR, EEPROM: 24C32, Audio: LV4921
Tuner: ENG37F03KF
Control: IR: TNPA4834 1 V
TX-L32U20 Specifications
PANASONIC TX-LR32U20
General recommendations for TV LCD repair
Possible malfunctions
- The PANASONIC TX-LR32U20 TV does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
With such manifestations, the TNP4G469 power supply module usually fails. Then you should measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches (B1CERR000043, B1CER000060) and the rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key most often breaks off.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) STR-A6059 (Stb), FA5501AN (PFC), SSC9512, in the absence of external damage and short circuit between the terminals, are checked by replacing them with known good ones.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear 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. 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.
If, when diagnosing a malfunction, it is required to turn off the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are completed, it is imperative to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the TNP4G468 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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - Nand Flash: H27U1G8F2BTR, EEPROM: 24C32, Audio: LV4921 with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
If you suspect a malfunction of the ENG37F03KF tuner, first of all, you need to make sure that the software is correct, as well as the presence of the necessary levels of supply voltages and pulses of data exchange with the processor via the I2C bus on the corresponding terminals of the tuner.
We remind users again! Attempts to repair the PANASONIC TX-LR32U20 TV on your own without the appropriate qualifications and the necessary experience can lead to its complete non-repairability! !!!!!!!!!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-LR32U20 Chassis KM09
E1432AGBG-8E-F, H27U1G8F2BTR, 24C32, 24C16, LV4921, BD8365KV, BU8364KV, D2817R, R2A11014AFT, AN34042A, TPS53125, TPC8116
MainBoard TNP4G468 is shown in the figure below:TNP4G468
External view of the power supply
The main features of the PANASONIC TX-LR32U20 device:
Installed matrix (LCD panel) AX080F072G.
A converter combined with a power supply is used to power the backlight lamps, it is controlled by a STR-H7214, STR-H3475 PWM controller. The keys of the B1CERG000030 type are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-LR32U20 TV is carried out by the TNP4G469 power module, or its analogs using STR-A6059 (Stb), FA5501AN (PFC), SSC9512 microcircuits and B1CERR000043, B1CER000060 power switches.
MainBoard - the main board (motherboard) is a TNP4G468 module, using Nand Flash chips: H27U1G8F2BTR, EEPROM: 24C32, Audio: LV4921 and others.
The ENG37F03KF tuner provides reception of television programs and tuning to channels.