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
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
