REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Friday 4 September 2020

REPAIRING / SERVICING TV PANASONIC TX-R32LE8KH

Technical description and composition of the PANASONIC TX-R32LE8KH TV, panel type and modules used. The composition of the modules.
PANASONIC
Model: TX-R32LE8KH TX-32LE8
Chassis / Version: LH80
Panel: LTA320AA03 M01
T-CON: 320AA03C2L V0.0
Inverter (backlight): INV32S12M Rev0.5
Power Supply (PSU): TNP4G433 AM A26410AU
PWM Power: FA5501AN (C0DBBZG00004), TUC4GJ5007
MainBoard: TNP4G431 BQ TVR4G51-3 A44401LX
IC MainBoard: EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448
Tuner: ENG39E04GF
Control: EUR7651140, IR: TNP4G448
TX-32LE8 Specifications
PANASONIC TX-R32LE8KH
General recommendations for TV LCD repair
Possible manifestations of defects
- The PANASONIC TX-R32LE8KH TV does not turn on. There are no signs of operability. The indicators on the front panel do not light up or blink, the TV does not respond to the remote control and control buttons.
In such cases, the fault should be looked for primarily in the TNP4G433 power supply module. 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 in the secondary circuits, the converter can operate in short-circuit mode, and in case of short-circuit in the elements of the primary circuit, the mains fuse 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 controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) FA5501AN (C0DBBZG00004), TUC4GJ5007 are usually checked by replacing them with new ones, or known to be working properly.
- 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.
Sometimes it is necessary to disable the inverter protection for diagnostic purposes. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- 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 TNP4G431 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). Complicated repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace elements EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448. BGA chip faults are usually easy to detect by warm-up.
Before changing the ENG39E04GF 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
Owners and users of the PANASONIC TX-R32LE8KH TV should remember that self-repair without special knowledge, skills and qualifications may be fraught with negative consequences that can lead to complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    PANASONIC TX-R32LE8 Chassis LH80  for models    TX-37LX80C, TX-32LX80C, TX-32LE8C-H, TX-32LE8C


 There is an option TX-R32LE8KS (Kaliningrad) - Panel: LTA320AA03, T-CON: 320AA03C2LV0.0, Main: TNP4G431 BQ, Power: TNP4G433 AM 4, Inverter: INV32S12M REV0.5.

Additional MainBoard Repair
MainBoard TNP4G431 is shown in the figure below:
TNP4G431
External view of the power supply
The main features of the PANASONIC TX-R32LE8KH device:
Installed matrix (LCD panel) LTA320AA03 M01.
Matrix control uses the Timing Controller (T-CON) 320AA03C2L.
An INV32S12M inverter is used to power the backlight lamps.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-R32LE8KH TV is carried out by the TNP4G433 power module, or its analogs using FA5501AN (C0DBBZG00004), TUC4GJ5007 microcircuits.
MainBoard - the main board (motherboard) is a TNP4G431 module, using EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448 and others.
The ENG39E04GF tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AA03
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Brightness: 500 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: CCFL
Signal Interface: LVDS (1 ch, 8-bit)
Voltage: 12.0V
PANASONIC TX-32LE8 TV with LCD display LTA320AA03, 32 "(81 cm) in 16: 9 format. Dynamic contrast ratio 10000: 1 is provided by special control of backlight operation depending on the illumination of areas in the scene.
The LTA320AA03 panel and TNP4G431 firmware can display HD images 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.
Speaker power 20 W (2x10 W) is provided by two speakers. NICAM STEREO sound processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x3, audio x4, S-Video, component, 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, which supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
Dimensions: with stand 820x578x225 mm, without stand 820x539x108 mm.
Attention! The LTA320AA03 M01 panel of the PANASONIC TX-32LE8 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!
Posted By: FRANK at 06:56
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