Technical description and composition of the PHILIPS 20PFL3403S TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 20PFL3403S / 60
Chassis / Version: TCM1.0E LA
Panel: LC201V02 SD D1
Inverter (backlight): JSY-200623 JSY-190406
PWM Inverter: TL494C (16) LM393 (8)
MOSFET Inverter: ME4542 (8)
Power Supply (PSU): 40-PWL20C-PWI1XG // 40-PWL20C-PWH1XG
PWM Power: NCP1377 (PWM flyback 8pin)
MOSFET Power: 2SK2996
Mainboard: MA1
IC MainBoard: MT8200ALE S29AL016M K4S641632K TDA9886T
Tuner: TEDE9-2C2B
Technical Specifications 20PFL3403D
PHILIPS 20PFL3403S
General recommendations for repairing TV LCD
Like all other televisions, it is advisable to start PHILIPS 20PFL3403S / 60 with a careful inspection of both external and internal elements and modules. Visible damage to elements can sometimes suggest directions for troubleshooting even before the necessary measurements are taken. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of the element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the 40-PWL20C-PWH1XG power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, which is typical for certain PHILIPS models and happens much less often. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. If it breaks, you should check the power switch SK3568, and the rectifier bridge diodes for an avalanche (thermal) breakdown.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller L6563 (14), LM393 (8 ), VIPer22A (8), which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the inverter should be checked.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during work, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
If the motherboard PLH800506A is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes you can check the health of MB only by replacement. When repairing an MB board, you must check its components. Defective items should be replaced.
Attention to users! Do-it-yourself repair of the PHILIPS 20PFL3403S / 60 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual and schematic diagram 20PFL3403S/60 Chassis TCM1.0E LA
PSU SCHEMATIC -------------------> 40-PWL20C-PWH1XG.
MODELS: 19PFL3403, 19PFL3403S, 20PFL3403, 22PFL3403, 26PFL3403
The appearance of MainBoard MA1 is shown in the figure below:MA1
MA1 can be used in TVs:
ERISSON 19LET11 (Panel M185XW0.1 V.6 720p HD 1366x768), PHILIPS 19PFL3403/60 (Panel M190Z1-L01 Rev.C1), PHILIPS 19PFL3403S/60 (Panel M190Z1-L01 Rev.C1 (CHI MEI)), PHILIPS 20PFL3403S/60 (Panel LC201V02 SD D1), PHILIPS 22PFL5403H/60 (Panel M220Z1-L03), PHILIPS 26PFL3403/60 (Panel T260XW03 V.3), THOMSON 26E90NH10 (Panel V260B1-L02).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the 40-PWL20C-PWI1XG module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the L6563 14pin 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 20PFL3403S device:
Installed matrix (LCD panel) LC201V02 SD D1.
The JSY-200623 inverter is used to power the backlight lamps; it is controlled by the TL494C (16) LM393 (8) PWM controller. As the power elements of the inverter, keys of the type ME4542 (8) are used.
The necessary supply voltages for all nodes of the PHILIPS 20PFL3403S TV are generated by the 40-PWL20C-PWI1XG power supply module, or its analogs using NCP1377 microcircuits (PWM flyback 8pin) and 2SK2996 power switches.
MainBoard - the main board (motherboard) is a MA1 module, using chips MT8200ALE S29AL016M K4S641632K TDA9886T and others.
The TEDE9-2C2B tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC201V02-SDD1
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 12/13 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: CMOS (1 ch, 8-bit), 41 pins
Voltage: 12.0V
