Technical description and composition of the PANASONIC TX-LR32X20 TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-LR32X20 TX-L32X20
Chassis / Version: LA01
Panel: AX080A076G
Inverter (backlight): integrated into PSU
PWM Inverter: STR-H3475, STR-H7214
Trans Inverter: T982 N0G3
Power Supply (PSU): TNPA5123 AA 3
PWM Power: FA5501AN, SSC9512, STR-A6052M
MOSFET Power: B1CERR000043 (K12A60D), B1CERQ000060 (K8A55DA)
MainBoard: TNPH0849 1 A
IC MainBoard: MN2WS0130FH, M24C16WP, M24C32WP
Tuner: ENG37F03KF
Control: IR: TNPA5134 1
TX-L32X20 Specifications
PANASONIC TX-LR32X20
General recommendations for TV LCD repair
Possible malfunctions
- TV PANASONIC TX-LR32X20 does not turn on and does not give any signs of turning on, does not respond to control buttons and to the remote control.
Most often, with similar manifestations, the main power supply module TNPA5123 turns out to be faulty. 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 (K12A60D), B1CERQ000060 (K8A55DA)) and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in a short circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
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) FA5501AN, SSC9512, STR-A6052M, 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 the image may appear for a second when turned on and disappear immediately.
A defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, ring the power switches in its converter 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 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 TNPH0849 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). Repair of the board and replacement of microcircuits MN2WS0130FH, M24C16WP, M24C32WP are made if the necessary equipment and the corresponding element base are available. Malfunctions associated with the use of BGA soldering technologies can be localized by the warm-up method.
The malfunction of the ENG37F03KF tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be monitored with an oscilloscope.
We remind users again! Attempts to repair the PANASONIC TX-LR32X20 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-LR32X20 Chassis LA01 for models TX-L32X20B, TX-L32X20E, TX-L32X20L
The appearance of the MainBoard TNPH0849 is shown in the figure below:TNPH0849
External view of the power supply
The main features of the PANASONIC TX-LR32X20 device:
Installed matrix (LCD panel) AX080A076G.
A converter combined with a power supply is used to power the backlight lamps, it is controlled by the STR-H3475, STR-H7214 PWM controller. The transformer T982 N0G3 is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-LR32X20 TV is carried out by the TNPA5123 power module, or its analogs using FA5501AN, SSC9512, STR-A6052M microcircuits and power switches of the B1CERR000043 (K12A60D), B1CERQ000060 (K8A55DA) type.
MainBoard - the main board (motherboard) is a TNPH0849 module, using microcircuits MN2WS0130FH, M24C16WP, M24C32WP and others.
The ENG37F03KF tuner provides reception of television programs and tuning to channels.
PANASONIC TX-L32X20 TV with LCD AX080A076G, 32 "(81 cm) in 16: 9 format. Dynamic contrast ratio of 20,000: 1 is provided by special control of backlighting depending on the illumination of areas in the scene.
The AX080A076G panel and TNPH0849 firmware enable HD viewing at 1366x768 pixels for 720p graphics resolution (HD Ready). The input analog video signal can be processed in PAL, SECAM, NTSC systems. Graphic processing and formation of a digital signal picture occurs in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Multimedia file formats supported by the video processor: MPEG4, JPEG.
The power of the acoustic audio system is 20 W (2x10 W) provided by two speakers. Uses NICAM stereo signal system and Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x3, audio x3, component, VGA, HDMI x3. A headphone output is provided for individual listening. To connect a computer or laptop, a VGA (D-Sub 15) connector is used that supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768.
The digital tuner is capable of receiving terrestrial and cable channels in DVB-T MPEG4 standards.
The power consumed by the TV in operating mode from the network is 77 watts.
Dimensions: with stand 798x551x217 mm, without stand 798x511x83 mm.
TV weight: with stand: 11 kg, without stand: 9.5 kg.
Attention! The panel AX080A076G of the PANASONIC TX-L32X20 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!