3-12
ONE POINT REPAIR GUIDE
11. NO SOUND FROM THE L ch SPEAKER.
11-1. IC701 (NO 25 VA / 12 V)
11-1-1. Solution
Replace IC701 on AMP board.
11-1-2. How to troubleshoot (Countermeasure)
1) Please check C738 for 25 VA of IC701, 12 V of R700.
If 25 VA is abnormal, check the parts (JK300, F301, F300, C301, D300). And, change the weird one.
If 12 V is abnormal, follow the stage 1-1 (IC302).
2) If 25 VA and 12 V are OK, but no sound from the speaker, check TWL_P/N, FL_P/N signals
(R602, R603, R607, R608).
3) If their signals are OK, follow the stage 7-1 (IC304).
4) If it is OK, check PWM_RST signal (R604), It should be high.
5) If there is no problem, check frequency of X600 (24.576 MHz).
6) If it is OK, check I2S signals (R618, R619, R620).
If it is OK, replace IC600.
If it is abnormal, follow the stage 13-1 (IC503, IC504).
7) If it is OK, replace IC701.
11-1-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
IC701
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