Amp Power - LG CM9750 Service Manual

2. NO AMP POWER
If the unit doesn't work by no ±PVDD problem, repair the set according to the following guide.
2-1. FUSE/ FET
2-1-1. Solution
Please check and replace F911, Q911 ~ Q914 on SMPS board.
2-1-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F911 is open or short-circuit.
2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q911~Q914 with a digital multimeter.
  If it is short condition, it's destroyed. Replace it with a new one.
(Please replace 4 FET at the same time although several FET is OK)
2-1-3. Service hint (Any picture / Remark)
< F911 >
If F911 is not short-circuit,
replace it with a same specifi cations one.
ONE POINT REPAIR GUIDE
If Q911 ~ Q914 is short-circuit,
replace it with a new one.
3-3
< Q911 ~ Q914 >