Daewoo DTH-25G1FST/FSP/FS, Service Manual

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TROUBLE SHOOTING CHARTS
4. NO SOUND
Step Check Point
Condition
Rem ark
Yes No
1 Check waveform next step Replace RC125, Z205, I501
2 Check waveform next step Replace I501
3 Check waveform P M 01 CO M P next step Check/replace Q C602
4 Check RI,LI of PM 01 next step Check/replace I601
5 Check RO ,LO of PM 01 next step Check/replace I601, IA01
6 Check SCL,SDA of PM 01 next step Check/replace I601, I603
7 Check Rin,Lin of PM 01 next step Check/replace I602, I603
8 Check #2 of I602 next step Check/replace Q C601
9 Vcc is 22V ? next step Check/replace D610, D814, R820, L811
10 Check sound output. M ax:5W +5W Replace I602