Protection Symptom Occurrence - LG FH6 Service Manual

7. PROTECTION SYMPTOM OCCURRENCE

Auto power-off and "S-protection" or "D-protection" is displayed on VFD.
S-protection is displayed when over-current or over-temperature is detected on output.
D-protection is displayed when the DC level is detected on output. (Audio signal is AC level.)
7-1. S-protection/ D-protection
7-1-1. Solution
Check SMPS board and IC702 (AMP IC) on MAIN board.
7-1-2. How to troubleshoot (Countermeasure)
1) Check if SPK CNT CN702/ CN703 or SPK Cable is short status.
2) Check PVDD voltage of IC702. (40 V ~ 50 V).
2) If problem still occurs, check IC702 (AMP IC).
- Check AMP_12V of IC702.
- Check L701, L702, C720, C738 soldering status.
7-1-3. Service hint (Any picture/ Remark)
CN702 CN702
LEFT SPK LEFT SPK
C720, C738 C720, C738
(TAS5631) (TAS5631)
ONE POINT REPAIR GUIDE
CN703 CN703
RIGHT SPK RIGHT SPK
L701, L702 L701, L702
IC702 IC702
< MAIN board top view >
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