LG RN7 - One Point Repair Guide

3-2
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Only for training and service purposes.
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/ THERMISTOR/ BRIDGE DIODE
1-1-1. Solution
Please check and replace F901, TH901, 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 TH901 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.
ON5/ RN5 : 5 A (Red)
ON7/ RN7 : 5 A (Red)
ON9/ RN9 : 8 A (Green)
< BD901 >
If BD901 is short-circuit,
replace it with a new one.
ON5/ RN5 : GBL08
ON7/ RN7/ ON9/ RN9 : GBU606G or RBU605M
< TH901 >
If TH901 is open,
replace it with a new one.