Technical description and composition of the PHILIPS 42PFL3312S TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 42PFL3312S / 60
Chassis / Version: LC7.1E LA
Panel: LC420WX8 (SL) (B1) // LC420WXE (SA) (A1)
T-CON: 6870C-0163A (LC420WX8-SLB1), 6870C-0207B (LC420WXE-SAA1)
Inverter (backlight): PLHL-T605 / T606A PIPB rev2.1
PWM Inverter: MSC1691A, KIA393F
MOSFET Inverter: FDD8447L
Power Supply (PSU): PLHL-T605A / T606A PIPB rev2.1
PWM Power: FAN7382, NCP1207A, 5501A (PFC)
MOSFET Power: FDPF7N50U
MainBoard: 3139_123_62611
IC MainBoard: CPU: M30300SAGP; DRAM: EDS1216AGTA; NAND Flash: M29W320ET70N; EEPROM: M24C64; SOUND: TDA8932T
Tuner: UV1318S / A
Control: Remote: RC-2023601, RC-2023615; IR: 3139 123 6210.1v2 WK632.5
Specifications 42PFL3312S
PHILIPS 42PFL3312S
General recommendations for repairing TV LCD
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should inspect all the internal elements of the LC7.1E LA chassis, as well as the external chassis. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
If the PLHL-T605 / T606A PIPB rev2.1 power supply module malfunctions, the external manifestations may be different, for example, the PHILIPS 42PFL3312S does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should begin by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
Power switches in pulsed power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
If PHILIPS 42PFL3312S does not have an image, but there is sound and the TV is controlled from the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors. It should be remembered that in cases of disconnection of the inverter protection (for diagnostic purposes) there is a risk of failure of the power elements of the inverter and special care should be taken. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
Service manual and schematic diagram 42PFL3312S/60 Chassis LC7.1E LA
FOR MODELS: 26PFL3312/10, 26PFL3312S/60, 26PFL5322/10, 26PFL5322/12, 26PFL5322S/60, 26PFL7332S/60, 32PFL3312/10, 32PFL3312S/60, 32PFL5322/10, 32PFL5322/12, 37PFL3312/10,37PFL3312S/60, 37PFL5322/10, 37PFL5322/12, 37PFL5322S/60, 42PFL3312/10, 42PFL3312S/60, 42PFL5322/10, 42PFL5322/12, 42PFL5322S/60
The appearance of MainBoard 3139_123_62611 is shown in the figure below:3139_123_62611
3139_123_62611 can be used in TVs:
PHILIPS 26HF5445/10 (Panel V260B1-L03 code 068 p/n: 932224937682), PHILIPS 26PFL5322S/60 (Panel V260B1-L03 Rev.C3), PHILIPS 26PFL7332S/60 (Panel V260B1-L03 Rev.C3), PHILIPS 32PFL3312S/80 (Panel V315B1-L05 REV.C1), PHILIPS 32PFL5322S/60 (Panel LK315T3LZ93Q), PHILIPS 32PFL5322S/60 (Panel T315XW02 V.D), PHILIPS 32PFL5332S/60 (Panel T315XW02), PHILIPS 37PFL3312/10 (Panel LC370WX1-SLB1), PHILIPS 37PFL3312S/60 (Panel LC370WX4-SLB1), PHILIPS 37PFL3312S/60 (Panel LC370WX5 (SL)(B1)), PHILIPS 37PFL5322S/60 (Panel LC370WX4-SLB1), PHILIPS 37PFL5322S/60 (Panel LC370WX4-SLB1 T704A REV-0.8), PHILIPS 37PFL7662D/12 (Panel T370HW02 V.1), PHILIPS 42PFL3312S/60 (Panel LC420WX8 (SL)(B1)), PHILIPS 42PFL5322S/60 (Panel LC420WX7 SLB1 T703C), PHILIPS 42PFL7662D/12 (Panel LC420WU5 code 093), PHILIPS 42PFL7682D/12 (Panel LC420WU5), PHILIPS 47PFL5522D/12 (Panel LC470WX1-SLA2 code 109 p/n: 932225331682 (LGPH) B ).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the PLHL-T605A / T606A PIPB rev2.1 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the PT5501A 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 was 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 42PFL3312S device:
Installed matrix (LCD panel) LC420WX8 (SL) (B1) or LC420WXE (SA) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0163A.
To power the backlight, an inverter PLHL-T605 is used, it is controlled by a PWM controller MSC1691A, KIA393F. As power elements of the inverter, keys of the FDD8447L type are used.
The necessary supply voltages for all nodes of the PHILIPS 42PFL3312S TV are generated by the PLHL-T605A power module or its analogs using FAN7382, NCP1207A, 5501A (PFC) microcircuits and FDPF7N50U type power switches.
MainBoard - the main board (motherboard) is a module 3139_123_62611, using CPU chips: M30300SAGP; DRAM: EDS1216AGTA; NAND Flash: M29W320ET70N; EEPROM: M24C64; SOUND: TDA8932T and others.
The UV1318S / A tuner allows you to receive television programs and tune to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC420WX8-SLB1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive