LG S92T2-C Service Manual page 139

3. How to Duplicate Problem
Wireless rear speaker doesn't output a sound.
3-1. Solution
Replace RIC307 (No 3.3 V)
3-2. How to troubleshoot (Countermeasure)
PWM 3.3 V (RIC307 pin3) no
output.
NO
Check Module or connection.
3-3. Service hint (Any picture / Remark)
RIC307 RIC307 RIC307
< AMP board top view >
ONE POINT REPAIR GUIDE
YES
5 VA (RIC307 pin2) no input.
Replace RIC307.
RIC308 RIC308 RIC308
YES
NO
5-4
Check SMPS board.