Technical description and composition of the PHILIPS 42PFL7962D TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 42PFL7962D / 12
Chassis / Version: LC7.5E LA
Panel: T420HW01 V.2 code 110
Inverter (backlight): VIT7104.51 S LOGAH REV: 2 VIT1043.50 M
PWM Inverter: OZ954SN (20), LM339 (14), ST 323 eZCS726 (14)
MOSFET Inverter: P1504BDG P2504EDG
Trans Inverter: T51-0165.211 E5
Power Supply (PSU): PLCD300P3 24573
PWM Power: TEA1601T (16), TEA1533AT (14), L6562D (PFC)
MOSFET Power: 2SK4075, F11NM60N, P4NK60ZFP, P6NK60ZFP
MainBoard: 3139-123-62731 WK720.4 3139 268 52502
IC MainBoard: CPU: M30300SAGP; DRAM: K4D261638K; SII9185ACTU;
Tuner: UV1318S / AIH-3
Specifications 42PFL7962D
PHILIPS 42PFL7962D
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the electronic device, in particular PHILIPS with the LC7.5E LA chassis, with a careful external examination of internal and external elements. Many visible changes in the state of the elements make it possible to determine the further direction of troubleshooting and localization of the defect. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
If the power supply module PLSD300P3 24573 is malfunctioning, the external manifestations may be different, for example, PHILIPS 42PFL7962D does not turn on at all and there is no indication of indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
The reasons for the breakdown of the power switch in switching power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the TEA1601T (16), TEA1533AT (14) PWM controller chip, L6562D (8) or breakage of resistors in its harness.
In cases where the PHILIPS 42PFL7962D TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power. When diagnosing a malfunction of the inverter with the protection turned off, special care must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
The LC07S motherboard must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
We recommend the owners of the 42PFL7962D TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
Service manual and schematic diagram 42PFL7962D/12 Chassis LC7.5E LA
FOR MOD: 32PFL7962D, 42PFL7962D, 32PFL7762D, 42PFL7762D, 52PFL7762D.
PSU SCHEMATIC ------------------> PLCD300P3
The appearance of MainBoard 3139-123-62731 is shown in the figure below:3139-123-62731
3139-123-62731 can be used in televisions:
PHILIPS 32PFL7762D/12 (Panel LC320W01-SLB1 code 116), PHILIPS 32PFL7782D/12 (Panel V315B1-L05 Rev.C1 code 069), PHILIPS 32PFL7962D/12 (Panel V315B1-L05 code 116 or 069 p/n: 932225393682), PHILIPS 42PFL7962D/12 (Panel T420HW01 V.2 code 110), PHILIPS 32PFL7772D/12 (Panel LC320W01), PHILIPS 42PFL7772D/12 (Panel T420HW01 V.2 code 110).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the PLCD300P3 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the L6562D PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the PHILIPS 42PFL7962D device:
Installed matrix (LCD panel) T420HW01 V.2 code 110.
The VIT7104.51 inverter is used to power the backlight, it is controlled by the OZ954SN (20), LM339 (14) PWM controller, ST 323 eZCS726 (14). The transformer T51-0165.211 E5 is installed in the inverter converter. As power elements of the inverter, keys of the type P1504BDG P2504EDG are used.
The necessary supply voltages for all nodes of the PHILIPS 42PFL7962D TV are generated by the PLCD300P3 power supply module or its analogs using TEA1601T (16), TEA1533AT (14), L6562D (PFC) microcircuits and power switches of the type 2SK4075, F11NM60N, P4NK60ZFP, P6NK60ZFP, P6NK60ZFP.
MainBoard - the main board (motherboard) is a module 3139-123-62731, using CPU chips: M30300SAGP; DRAM: K4D261638K; SII9185ACTU; and others.
The UV1318S / AIH-3 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T420HW01 V2
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 15/5 (Tr / Td); 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
