Technical description and composition of the PHILIPS 42PFL3403 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 42PFL3403 / 12
Chassis / Version: LC8.1E LB
Panel: LC420WXE (SA) (A1)
Lamp backlight: 18 Lamp CCFL
T-CON: LC420WXE P / N 6870-0207B
Inverter (backlight): integrated into PSU
Power Supply (PSU): LIPS250PS02 - 3122 427 25041 - 3122 423 32646
PWM Power: L6562D, NCP1205DG
MOSFET Power: P5NK50ZPF, STTH8R06FP
MainBoard: 3139_123_64241 3139 123 64241 V3 Wk19.3
IC MainBoard: TDA15471HV / N1C00, HY5DU281622FTP, TDA8932T, TDA8890H1N18, WT61P8S, NCP5422AG
Tuner: UV1316E / ABH-5
Specifications 42PFL3403D
PHILIPS 42PFL3403
General recommendations for repairing TV LCD
Possible manifestations of defects
- The PHILIPS 42PFL3403 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Failure in such cases should begin to be sought in the LIPS250PS02 power supply circuits. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the 3139_123_64241 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - TDA15471HV / N1C00, HY5DU281622FTP, TDA8932T, TDA8890H1N18, WT61P8S, NCP5422AG and replace the failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner UV1316E / ABH-5. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention TV owners! Attempts at self-repair of PHILIPS 42PFL3403 are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual and schematic diagram 32PFL3403/12 Chassis LC8.1E LB
FOR MODELS 32PFL3403/12, 42PFL3403/12
3139_123_64241
3139_123_64241 can be used on TVs:
PHILIPS 32PFL3403/12 (Panel LC320WXN (SA)(B1) code 136), PHILIPS 42PFL3403/12 (Panel LC420WXE (SA)(A1)).
The appearance of the power supply
Main features of the PHILIPS 42PFL3403 device:
Installed matrix (LCD panel) LC420WXE (SA) (A1).
The matrix control uses the Timing Controller (T-CON) LC420WXE.
To power the backlight, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the PHILIPS 42PFL3403 television are generated by the LIPS250PS02 power supply module or its analogs using L6562D, NCP1205DG microcircuits and power switches of the P5NK50ZPF, STTH8R06FP type.
MainBoard - the main board (motherboard) is a module 3139_123_64241, using TDA15471HV / N1C00, HY5DU281622FTP, TDA8932T, TDA8890H1N18, WT61P8S, NCP5422AG and others.
The UV1316E / ABH-5 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC420WXE-SAA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.25x523.01 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1100: 1
Display Colors: 16.7M (8-bit)
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V