Technical description and composition of the PANASONIC TX-R37LX85 TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-R37LX85 TX-37LX85
Chassis / Version: GLP23
Panel: AX094A011A
T-CON: TCON103-F KF9714 19100106
Inverter (backlight): PB-071095D REV: 01 - JLS-04-37EI
PWM Inverter: BD9897FS
MOSFET Inverter: D8519, FDD8447L
Trans Inverter: RDT-0582
Power Supply (PSU): TNP8EPL90 9
PWM Power: FA5501A (C0DABZZ00012), MP2A5077 (C5HAZZZ00012)
MOSFET Power: 2SK3502 (B1CERR000022)
MainBoard: TNP8EAL90
IC MainBoard: EEPROM: 24LC16BT, Audio: LV4920
Tuner: ENG37E09KF
Control: IR: TNP8EVL92 TXN / VL10NVB
TX-37LX85 Specifications
PANASONIC TX-R37LX85
General recommendations for TV LCD repair
Possible manifestations of defects
- The PANASONIC TX-R37LX85 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Often in such cases the TNP8EPL90 power supply module is faulty. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches (2SK3502 (B1CERR000022)) and the rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency in the short-circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) FA5501A (C0DABZZ00012), MP2A5077 (C5HAZZZ00012), if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- 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.
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 necessary to restore the protection circuits for the further safe operation of the TV by the owner in normal mode.
- 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 TNP8EAL90 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). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - EEPROM: 24LC16BT, Audio: LV4920. In cases where a BGA processor is used, its malfunction is usually detected by a local warm-up method.
PANASONIC TX-37LX85 has no image when a signal is present, often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) AX094A011A, 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 AX094A011A - 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 the main board MainBoard TNP8EAL90 often 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 needs to track the passage of LVDS signals from the MainBoard TNP8EAL90, as well as synchronizing signals from T-CON to loops with drivers.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the ENG37E09KF tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Owners and users of the PANASONIC TX-R37LX85 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-R37LX85 Chassis GLP23 for models TX-37LX85F, TX-37LX85L, TX-37LX85P, TX-32LX85F, TX-32LX85L, TX-32LX85P, TX-R37LX85, TX-R32LX85
MainBoard TNP8EAL90 is shown in the figure below:TNP8EAL90
External view of the power supply
The main features of the PANASONIC TX-R37LX85 device:
Installed matrix (LCD panel) AX094A011A.
Matrix control uses the TCON103-F Timing Controller (T-CON).
The inverter PB-071095D is used to power the backlight lamps, it is controlled by the PWM controller BD9897FS. The transformer RDT-0582 is installed in the inverter converter. The switches of the D8519, FDD8447L type are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-R37LX85 TV is carried out by the TNP8EPL90 power module, or its analogs using the FA5501A (C0DABZZ00012), MP2A5077 (C5HAZZZ00012) and 2SK3502 (B1CERR000022) power switches.
MainBoard - the main board (motherboard) is a TNP8EAL90 module, using EEPROM chips: 24LC16BT, Audio: LV4920 and others.
The ENG37E09KF tuner provides reception of television programs and tuning to channels.
PANASONIC TX-37LX85 TV with LCD AX094A011A, 37 "(94 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 AX094A011A panel and TNP8EAL90 board 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, 1080p. Multimedia file formats supported by the video processor: 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, audio x2, S-Video, component, SCART x2, 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: 17.5 kg.
Attention! The AX094A011A panel of the PANASONIC TX-37LX85 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!