LG CM9530 - Page 22

3-3
ONE POINT REPAIR GUIDE
NO POWER
If the unit doesn’t work by no ±PVDD problem, repair the set according to the follow-
ing guide.
1-2. NO AMP POWER
1-2-1. Solution
Please check and replace F911, Q905, Q906 on SMPS board.
1-2-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.
2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q905, Q906 with a digital multi-meter.
 If it is short condition, it’s destroyed. Replace it with a new one.
(Please replace 2 FET at the same time although several FET is OK)
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< F911 >
If F911 is not short-circuit,
replace it with a same specifi cations one.
< Q905, Q906 >
If Q905, Q906 is short-circuit,
replace it with a new one.