One Point Repair Guide; Power - LG OK99 Service Manual

1. NO POWER
If the unit doesn't work by no power problem, repair the set according to the following guide.
1-1. FUSE/ THERMISTOR/ BRIDGE DIODE
1-1-1. Solution
Please check and replace F901, TH900 ~ TH903, BD901 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 NTC thermistor TH900 ~ TH903 is normal or open.
3) Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
1-1-3. Service hint (Any picture / Remark)
< F901 >
If F901 is not short-circuit,
replace it with a same
specifi cations one.

ONE POINT REPAIR GUIDE

< TH900 ~ TH903 >
If TH900~TH903 is open,
replace it with a new one.
3-2
Copyright © 2018 LG Electronics Inc. All rights reserved.
< BD901 >
If BD901 is short-circuit,
replace it with a new one.
Only for training and service purposes.