Technical description and composition of the PANASONIC TX-R37LX86K TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-R37LX86K TX-37LX86
Chassis / Version: LH76
Panel: AX094A015A
T-CON: TCON103-F
Inverter (backlight): MPV8A080 PCPV0067
PWM Inverter: BD9766FV
Power Supply (PSU): TNPA4638 1 P
PWM Power: MP2B6120 (C0DABYY00008), FA5501AN (C0DBBZG00004), C0DBBYG00001
MainBoard: TNPH0729 2 A
IC MainBoard: EEPROM: 24C16, Tuner: WJCE6353
Tuner: ENG39E04GF
Control: IR Sensor TNPA4480 1 V
TX-37LX86 Specifications
PANASONIC TX-R37LX86K
General recommendations for TV LCD repair
Possible malfunctions
- The PANASONIC TX-R37LX86K 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.
With such manifestations, a malfunction is most likely found in the TNPA4638 power supply module. It is then necessary to measure its output voltages and, if they are absent, the power switches and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key is often cut 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) MP2B6120 (C0DABYY00008), FA5501AN (C0DBBZG00004), C0DBBYG00001 are usually checked by replacing them with new ones, or knowingly 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
The defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of the lamps or the inverter.
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 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 TNPH0729 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). Often the MB (SSB) board needs to be replaced in the event of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - EEPROM: 24C16, Tuner: WJCE6353 and replace the failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
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 pins and check the software for correctness. The pulses of data exchange between the tuner and the processor can be monitored with an oscilloscope
PANASONIC TX-37LX86 has no display when there is a signal, often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) AX094A015A, for example, a malfunction of CCFL (EEFL) lamps, and outside in their power source - an inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, repairing the backlight requires disassembling the LCD panel AX094A015A - a painstaking process that requires special attention and accuracy from the master. In such cases, there is a possibility, with the slightest negligence, to damage the glass or loops and the TV may become unrepairable.
We strongly do not recommend doing such work to owners of TVs and craftsmen who do not have experience in repairing LCD panels! Moreover, at home (at the owner's home).If there is no image in the presence of backlight, the screen becomes slightly lighter when turned on, and if the TV is open, the light from the lamps can be seen through the holes in the panel case.
In this case, there may be a malfunction inside the panel, damage to strips, loops, the T-CON board (Timing Controller) may be defective. But often the main board MainBoard TNPH0729 also turns out to be faulty, a software failure is also possible.
In such cases, the master first of all needs to check the main supply voltage of the panel at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for line and column drivers - VGH, VGL, Vcom.If all of the above measurements are within the normal range, then the oscilloscope must track the passage of LVDS signals from the MainBoard TNPH0729, as well as synchronization signals from T-CON to loops with drivers.
Owners of the TX-R37LX86K TV are advised to contact only qualified specialists with the necessary experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-R37LX86K Chassis LH76
MainBoard TNPH0729 is shown in the figure below:TNPH0729
External view of the power supply
The main features of the PANASONIC TX-R37LX86K device:
Installed matrix (LCD panel) AX094A015A.
Matrix control uses the TCON103-F Timing Controller (T-CON).
To power the backlight lamps, the MPV8A080 inverter is used, controlled by the BD9766FV PWM controller.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-R37LX86K TV is carried out by the TNPA4638 power module, or its analogs using the MP2B6120 (C0DABYY00008), FA5501AN (C0DBBZG00004), C0DBBYG00001 microcircuits.
MainBoard - the main board (motherboard) is a TNPH0729 module, using EEPROM chips: 24C16, Tuner: WJCE6353 and others.
The ENG39E04GF tuner provides reception of television programs and tuning to channels.
PANASONIC TX-37LX86 TV with LCD AX094A015A, 37 "(94 cm) in 16: 9 format. Dynamic contrast ratio 10000: 1 is provided by special control of the backlight depending on the illumination of areas in the scene.
The AX094A015A panel and TNPH0729 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. Multimedia file formats supported by the video processor: JPEG.
Speaker power 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 x3, S-Video, component, RGB, VGA, HDMI x3. 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.
The power consumed by the TV in operating mode from the network is 180 watts.
Dimensions: with stand 940x645x294 mm, without stand 940x605x120 mm.
TV weight: with stand: 21 kg, without stand: 19 kg.
Attention! The panel AX094A015A of the PANASONIC TX-37LX86 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!