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Sony d-311 no power, dead

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Post time: 2021-01-14 06:06:31 From the mobile phone
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Hello everybody! I just purchased a sony d-311 at a very good condition. Unfortunately the unit will not power up. This happens on both AA batteries and 6v power supply. When running on batteries, I can hear a tone from the headphone out. The tone stops if the play button is pressed. If you release the play button the tone will come on again. When I open the cd door, the tone changes. When running on 6v, nothing can be heard. The board is very clean inside. I checked all the electrolytic caps for short, all ok. I also checked the Q401, it was okay. What do you think it can be? Is it power related, or my IC801 is dead(rare case)? I saw this error in many d-311's, so if you if you encountered this issue before or you have any suggestion please let me know! Any help is greatly appreciated, thanks a lot,
kostgeor.
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Post time: 2021-01-14 09:19:20
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My suggestion is: replace all SMT caps and clean leaking on the PCB. Check and repair each  suspected VIAs at each leaking area. Most likely the CPU loses power.
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 Author| Post time: 2021-01-17 05:06:23 From the mobile phone
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Hello mr. Kaosun! You are really a master! I checked the voltage on the IC801 and it was lower than normal, so I followed the path carefully and under a capacitor, I found a broken line by electrolyte! Now the unit works perfectly! Thanks!
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