REPAIRING / SERVICING TV PANASONIC TX-26LX50P

Technical description and composition of the PANASONIC TX-26LX50P TV, panel type and modules used. The composition of the modules.
PANASONIC
Model: TX-26LX50P
Chassis / Version: LH41
Panel: LTA260W2-L05
Lamp backlight: 8 Lamp CCFL
T-CON: 260W2C4LV1.6
Inverter (backlight): SIT260W2D8UC03 HU26024W2B REV0.6
Power Supply (PSU): TNPA3487 2 AP & NPX565EB-1A (ETXMM565EBB)
PWM Power: C5HABZZ00165, MPD7S001, MPD7S001
MainBoard: TNPA3488 2 DG and TNPH0617 4 H (AV Board)
IC MainBoard: C5HABZZ00165, MPD7S001, MPD7S001
Tuner: ENG37A12GF
Control: IR: TNPA3490 4 V
TX-26LX50P Specifications
PANASONIC TX-26LX50P
General recommendations for TV LCD repair
Possible manifestations of defects
- PANASONIC TX-26LX50P TV does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
Often in such cases the TNPA3487 power supply module is faulty. It is necessary to measure its output voltages, and if they are absent (full or partial), the serviceability of the power switches of the converters and rectifier diodes should be checked for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) C5HABZZ00165, MPD7S001, MPD7S001, in the absence of external damage and short circuit between the terminals, are checked by replacing them with known good ones.
- There is no image, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
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. If all the electrolytic capacitors of the filter for the power supply of the inverter are in good working order, you should make sure that the lamps are in good condition, then you need to check the keys of the converter and the secondary windings of the transformers.
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).

Before replacing the ENG37A12GF tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. You also need to make sure that the tuner and processor can exchange data via the I2C bus

Owners and users of the PANASONIC TX-26LX50P TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to the complete non-repairability of the device!

DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    LH41 Chassis  for models TX-32LXD50, TX-26LXD50, TX-32LX50F, TX-32LX50P, TX-26LX50F, TX-26LX50P

Additional MainBoard Repair
The MainBoard TNPA3488 is shown in the figure below:
TNPA3488
External view of the power supply
Main features of the PANASONIC TX-26LX50P device:


Installed matrix (LCD panel) LTA260W2-L05.
Matrix control uses a Timing Controller (T-CON) 260W2C4LV1.6.
The SIT260W2D8UC03 inverter is used to power the backlight lamps.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-26LX50P TV is carried out by the TNPA3487 power module, or its analogs using 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: LTA260W2-L05
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 44%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8/6 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 8 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
PANASONIC TX-26LX50P TV with LCD LTA260W2-L05, 26 "(66 cm) 16: 9. , SECAM, NTSC Graphic processing and formation of a digital signal picture takes place in the 480i, 480p, 576i, 576p, 720p, 1080i standards.
The power of the acoustic audio system 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, component x3, SCART x3, RGB, VGA. A headphone output is provided for individual listening.
The power consumed by the TV in operating mode from the network is 126 watts.
Dimensions: with stand 663x556x300 mm, without stand 663x494x141 mm.
TV weight: without stand: 18 kg.
Attention! The LTA260W2-L05 panel of the PANASONIC TX-26LX50P 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!