Technical description and composition of the PANASONIC TX-R32LX70K TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-R32LX70K TX-32LX70
Chassis / Version: LH64
Panel: AX080A002A
Lamp backlight: CCFL
Inverter (backlight): integrated into PSU
Power Supply (PSU): MPC6601 & TNPA4116 & TNPA4117
PWM Power: MP2B6120 (C0DABYY00008)
MainBoard: TNPA4114 1 DG & TNPA42913 & TNPA4117 2 AP
IC MainBoard: MNZSFD7G
Tuner: ENGF7701GF
TX-32LX70 Specifications
PANASONIC TX-R32LX70K
General recommendations for TV LCD repair
Possible manifestations of defects
- The PANASONIC TX-R32LX70K TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
Most likely in this case the main switching power supply (SMPS) MPC6601 is faulty. 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 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 often 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 a PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and a short circuit between the terminals, are checked by replacing them with a known good one.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
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 transformers for an open circuit.
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 indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the TNPA4114 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). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - MNZSFD7G. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the ENGF7701GF tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Once again, we remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC Chassis LH64 for models TX-32LX70F, TX-32LX70L, TX-32LX70P, TX-26LX70F, TX-26LX70L, TX-26LX70P
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LH64 Chassis for models TX-32LX70F, TX-32LX70L, TX-32LX70P, TX-26LX70F, TX-26LX70L, TX-26LX70P
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LH64 Chassis for models TX-32LX700F, TX-32LX700P.
The MainBoard TNPA4114 is shown in the figure below:TNPA4114
External view of the power supply
Main features of the PANASONIC TX-R32LX70K device:
Installed matrix (LCD panel) AX080A002A.
A converter combined with a power supply is used to power the backlight lamps.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-R32LX70K TV is carried out by the MPC6601 power module, or its analogs using MP2B6120 microcircuits (C0DABYY00008).
MainBoard - the main board (motherboard) is a TNPA4114 module, using MNZSFD7G microcircuits and others.
The ENGF7701GF tuner provides reception of television programs and tuning to channels.
PANASONIC TX-32LX70 TV with LCD AX080A002A, 32 "(81 cm) 16: 9 format diagonal. Screen brightness of 500 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Contrast, as the ratio of maximum brightness to minimum, is 1200: 1. Dynamic contrast ratio of 7000: 1 is provided by a special control of the backlight depending on the illumination of areas in the scene.
The AX080A002A panel and TNPA42913 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 standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the acoustic audio system 20 W (2x10 W) is 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, audio x2, S-Video, component, SCART x2, RGB, VGA, HDMI x2. 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.
Dimensions: with stand 791x615x248 mm, without stand 791x563x117 mm.
TV weight: without stand: 17.5 kg.
Attention! The AX080A002A panel of the PANASONIC TX-32LX70 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!