Technical description and composition of the PANASONIC TX-LR32U3 TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-LR32U3 TX-L32U3
Chassis / Version: KM11E
Panel: VVX32F100G00
Inverter (backlight): integrated into PSU
PWM Inverter: BD9247F
MOSFET Inverter: K8A55DA
Trans Inverter: A995 N1H1
Power Supply (PSU): TNPA5361 AA
PWM Power: 2A11337, 1B11906
MOSFET Power: K12A60D, K4013
MainBoard: TNP8EA117 (MDK332V-0 W)
IC MainBoard: MN2WSO175E, H5TQ1G63DFR, 24C32WP, 24C16WP, LV4924,, 1F2548U, AN34043A
Tuner: ENGS7302D5F
Control: IR: TNPA5378 2
TX-L32U3 Specifications
PANASONIC TX-LR32U3
General recommendations for TV LCD repair
Possible malfunctions
- The PANASONIC TX-L32U3 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.
In such cases, you should start looking for a fault in the TNPA5361 power supply circuits. It is then necessary to measure its output voltages and, if they are absent, the power switches (K12A60D, K4013) and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and, less often, the current sensor in the source of the key.
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, 1V11906 5640 are usually checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and disappears 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.
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 on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
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). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard board - MN2WSO175E, H5TQ1G63DFR, 24C32WP, 24C16WP, LV4924,, 1F2548U, AN34043A. In cases where a BGA processor is used, its malfunction is usually detected by a local warm-up method.
Before changing the ENGS7302D5F tuner, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of data exchange between the tuner and the processor can 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 repairs to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-LR32U3 Chassis KM11E for models TX-L32U3E, TX-L32UX3E, TX-L37U3E
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis 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-LR32U3 device:
Installed matrix (LCD panel) VVX32F100G00.
A converter combined with a power supply is used to power the backlight lamps, it 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-LR32U3 TV is carried out by the TNPA5361 power module, or its analogs using 2A11337, 1B11906 microcircuits and power switches of the K12A60D, K4013 type.
MainBoard - the main board (motherboard) is a TNP8EA117 module, using the MN2WSO175E, H5TQ1G63DFR, 24C32WP, 24C16WP, LV4924,, 1F2548U, AN34043A and others.
The ENGS7302D5F tuner provides reception of television programs and tuning to channels.
The composition uses MainBoard TNP8EA117 MDK332V-0 W and LCD-panel VVX32F100G00.
Power supply unit (PSU) TNPA5361 AA Power Supply.
PANASONIC TX-L32U3 TV with VVX32F100G00 LCD, 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 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. 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 able to receive terrestrial and cable channels in the DVB-T MPEG4, DVB-C standards.
The power consumed by the TV in operating mode from the network is 77 watts.
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 glass and pressure on the surface of the screen to avoid irreversible damage to the LCD panel!