Technical description and composition of the PANASONIC TX-LR32U3A TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-LR32U3A TX-L32U3A
Chassis / Version: KM11E
Panel: VVX32F100G00 REV B
Inverter (backlight): integrated into PSU
PWM Inverter: BD9247F
MOSFET Inverter: K8A55DA
Trans Inverter: A995 N1H1
Power Supply (PSU): TNPA5361 AA 4 P
PWM Power: 2A11337 5591, 1B11906 5640
MOSFET Power: K12A60D, K4013
MainBoard: TNP8EA117 9 A
IC MainBoard: MN2WSO175E, H5TQ1G63DFR, 24C32WP, 24C16WP, LV4924, 1F2548U, AN34043A
Tuner: ENGS7302D5F
Control: IR: TNPA5378 1 KA
TX-L32U3 Specifications
PANASONIC TX-LR32U3A
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- The PANASONIC TX-LR32U3A 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.
Most likely in this case, the main switching power supply (SMPS) TNPA5361 is 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 (K12A60D, K4013) and rectifier diodes of the converters for a possible short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and in case of a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
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 regulator, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) 2A11337 5591, 1B11906 5640 are usually checked by replacing them with new ones, or known to be working properly.
- 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 triggered by the power module, or by defects in the inverter, as well as by skewed 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 converter keys 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 TNP8EA117 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). Repair of the board and replacement of microcircuits MN2WSO175E, H5TQ1G63DFR, 24C32WP, 24C16WP, LV4924, 1F2548U, AN34043A are made if the necessary equipment and the corresponding element base are available. Failures associated with the use of BGA soldering technologies can be localized by warming up.
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 terminals of the ENGS7302D5F tuner match. 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.
Attention to users! Self-repair of the PANASONIC TX-LR32U3A TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-LR32U3 Chassis KM11E TX-L32U3E, TX-L32UX3E, TX-L37U3E
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> GLP26 TX-L32U3E, TX-L32UX3E, TX-L37U3E
The MainBoard TNP8EA117 is shown in the figure below:TNP8EA117
External view of the power supply
The main features of the PANASONIC TX-LR32U3A device:
Installed matrix (LCD panel) VVX32F100G00 REV B.
A converter combined with a power supply is used to power the backlight lamps, and is controlled by the BD9247F PWM controller. The transformer A995 N1H1 is installed in the inverter converter. Keys of type K8A55DA are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-LR32U3A TV is carried out by the TNPA5361 power module, or its analogs using 2A11337 5591, 1B11906 5640 microcircuits and power switches of the K12A60D, K4013 type.
MainBoard - the main board (motherboard) is a TNP8EA117 module, using microcircuits MN2WSO175E, H5TQ1G63DFR, 24C32WP, 24C16WP, LV4924, 1F2548U, AN34043A and others.
The ENGS7302D5F tuner provides reception of television programs and tuning to channels.
PANASONIC TX-L32U3 TV with LCD VVX32F100G00, 32 "(81 cm) diagonal, 16: 9 format.
The VVX32F100G00 panel and TNP8EA117 motherboard firmware provide HD and Full HD viewing at 1920x1080 pixels in 1080p (Full HD) graphics. 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. Multimedia file formats supported by the video processor: MP3, 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, component, SCART, RGB, HDMI x2. A headphone output is provided for individual listening.
The digital tuner is capable of receiving terrestrial and cable channels in the DVB-T MPEG4, DVB-C standards.
The power consumed by the TV in operating mode from the mains is 77 W.
Dimensions: with stand 779x531x207 mm, without stand 779x497x85 mm.
TV weight: with stand: 9.5 kg, without stand: 8.5 kg.
Attention! The VVX32F100G00 panel of the PANASONIC TX-L32U3 LCD TV is a rather expensive component.
Avoid impacts on the glass and pressure on the screen surface to avoid irreversible damage to the LCD panel!