LG OM7550 - TROUBLESHOOTING GUIDES

3-2
ONE POINT REPAIR GUIDE
1. NO POWER
If the unit doesn’t work by no power problem, repair the set according to the following guide.
1-1. FUSE/ BRIDGE DIODE/ THERMISTOR
1-1-1. Solution
Please check and replace F901, BD901, TH900, TH901 on SMPS board.
1-1-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.
2) Check if the bridge diode BD901 is short-circuit by over current with a digital multimeter.
3) Check if the NTC thermistor TH900~TH902 is normal or open.
1-1-3. Service hint (Any picture / Remark)
< F901 >
If F901 is not short-circuit,
replace it with a same
specifi cations one.
< TH900, TH901 >
If TH900~TH901 is open,
replace it with a new one.
< BD901 >
If BD901 is short-circuit,
replace it with a new one.