Philips 42PFL5332, 42PFL7932 Schematic
Symptom cure for defective inverter of LC420WU5 – SLA1 or SLB1
LC420WU5-SLA1 used in: 42PFL7662D, 42PFL7682D, 42PFL7762D, 42PFL7782D,
42PFL7962D, 42PFL7982D
LC420WU5-SLB1 used in: 42PFL7862D, 42PFL9632D, 42PFL9732D, 42PFL9742D,
42PFL9900D
42PFL5342
Symptom:
Sound but no picture.
Cure:
Master or Slave inverter is defective.
It can be that the driver IC is defective or MOSFET’s that switch the voltage to the
inverter transformers.
Replace driver IC BD9897FS or MOSFET’s.
996500046243 IC BD9897FS
996500046242 Mosfet FDD8447L
996500046241 Zener KDZ100V
4 MOSFET’s should
be high ohmic
Driver-IC BD9897FS
1
Add 1 zenerdiode of 100V on Master inverter, but also 1 zenerdiode of 100V on
slave inverter. There is already a place for the zenerdiode on the board.
Attention for the polarity !!
- PNEL-T707A(MASTER) : MZD3 (Zener diode)
- PNEL-T708A(SLAVE) : SZD3 (Zener diode)
※ Make sure of the position and zener-diode’s cathode mark before
soldering.
PNEL-T707A
PNEL-T708A
( :Anode)
<Zenor diode>
<Printing Mark>
2
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