One Point Repair Guide; No Power - LG LAB550H Service Manual

1. NO POWER

If your BD sound plate set doesn't work by no power problem, repair the set according to the following
guide.
1-1. Fuse & Bridge Diode
1-1-1. Solution
Replace F900, BD900 on SMPS board.
1-1-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F900 is open or short-circuit.
2) Check if the bridge diode BD900 is short-circuit by over current with a digital multimeter.
 
1-1-3. Service hint (Any picture / Remark)
 If the fuse is open,
replace it with a same specifi cation's one.
 

ONE POINT REPAIR GUIDE

 
F900 F900
< SMPS board top view >
 If BD900 is short-circuit, replace it with a new one.
BD900 BD900
2-27
 