Technical description and composition of the PANASONIC TX-32LX50P TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-32LX50P
Chassis / Version: LH41
Panel: LTA320W2-L03
Lamp backlight: 16 Lamp CCFL
Inverter (backlight): KLS-320VE REV: 0.4
PWM Inverter: BD9884FV
MOSFET Inverter: SP8M3
Power Supply (PSU): TNPA3487 & NPX565EB 1A
PWM Power: C5HABZZ00165, MPD7S001, MPD7S001
MainBoard: TNPA3488 & TNPH0617 & TNPA3489
IC MainBoard: C5HABZZ00165, MPD7S001, MPD7S001
Tuner: ENG37A12GF
TX-32LX50P Specifications
PANASONIC TX-32LX50P
General recommendations for TV LCD repair
Possible malfunctions
- The PANASONIC TX-32LX50P TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
With such manifestations, a malfunction is most likely found in the TNPA3487 power module. It is necessary to measure its output supply voltages, and in their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor in the source of the key often breaks off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers C5HABZZ00165, MPD7S001, MPD7S001, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
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. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you should ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open.
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, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the TNPA3488 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 C5HABZZ00165, MPD7S001, MPD7S001 microcircuits are performed 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.
A malfunction of the ENG37A12GF 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.
Owners and users of the PANASONIC TX-32LX50P TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-32LX50P Chassis LH41 for models TX-32LXD50, TX-26LXD50, TX-32LX50F, TX-32LX50P, TX-26LX50F, TX-26LX50P
The MainBoard TNPA3488 is shown in the figure below:TNPA3488
External view of the power supply
Main features of the PANASONIC TX-32LX50P device:
Installed matrix (LCD panel) LTA320W2-L03.
The KLS-320VE inverter is used to power the backlight lamps and is controlled by the BD9884FV PWM controller. The keys of the SP8M3 type are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-32LX50P TV is carried out by the TNPA3487 power module, or its analogs using the C5HABZZ00165, MPD7S001, MPD7S001 microcircuits.
MainBoard - the main board (motherboard) is a TNPA3488 module, using C5HABZZ00165, MPD7S001, MPD7S001 and others.
The ENG37A12GF tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320W2-L03
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: APVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 40%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8/6 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
PANASONIC TX-32LX50P TV with LCD display LTA320W2-L03, 32 "(81 cm) diagonal 16: 9. Contrast, as the ratio of maximum brightness to minimum, is 800: 1.
The LTA320W2-L03 panel and TNPA3488 board 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.
The power of the acoustic audio system 20 W (2 * 5.4 W + 2 * 4.6 W) is provided by 4 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, S-Video, component, SCART x3, RGB. A headphone output is provided for individual listening.
The power consumed by the TV in operating mode from the network is 161 watts.
Dimensions: with stand 795x635x300 mm, without stand 795x573x141 mm.
TV weight: 21 kg.
Attention! The LTA320W2-L03 panel of the PANASONIC TX-32LX50P 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 !!!!!!!!!!!!!!!!!!!!!!!!