68kMLA Classic Interface

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Mac classic ii no video sound after recap.
Posted by: crazyben on 2023-09-16 08:25:25 I recapped the logic board. There is no power when I turn on so I need to recap the analog board as well. I have working classic on her plugged the classic ii board and there is no video or sound. What do I need to check next?
Posted by: bibilit on 2023-09-16 09:23:05 The Egret, legs are a bit tarnished
Posted by: crazyben on 2023-09-16 09:42:14 I can’t see anything wrong. What am I missing?
Posted by: bibilit on 2023-09-16 11:28:31 Look at those legs, the Egret is a sensible chip, i will remove the chip, clean the legs and board and put it back..
Posted by: imactheknife on 2023-09-16 17:26:07 I can’t see anything wrong. What am I missing? View attachment 62120 A lot of the time, the egret, sound chip and possibly others need to be removed and pads / legs cleaned for things to work again, like sound. Recapping only part if the restoration.
Posted by: crazyben on 2023-09-16 17:46:28 Got it. I will do that. And let you know.
Posted by: crazyben on 2023-09-17 09:34:00 Removed the erget chip and cleaned it. Still no progress. Can you guide me which chips I need to remove and clean in the board.
Posted by: Cam on 2023-09-17 10:21:00 What voltages are you getting on the board? Some of the solder joints look a little off, maybe add some flux and reheat them? Is there any audio from the headphone jack?
Posted by: crazyben on 2023-09-17 10:38:10 I am new to all this. How do I check voltage of the board? I haven’t tested sound from the headphone jack. I will do that once I am home.
Posted by: bibilit on 2023-09-17 10:39:33 I agree with Cam concerning joints, also many traces are a little greenish. I will check for a broken trace (mainly the last one) also U11 LM3080 should be checked for bad joints.
Posted by: Cam on 2023-09-17 18:15:38 I measure the voltages at the port in the back.
Posted by: imactheknife on 2023-09-17 18:37:06 Sound chip is circled
Posted by: crazyben on 2023-09-19 08:56:44 It is working after I pressed the reset. Sound is only from headphone. So I will need to check the sound chip.
Posted by: crazyben on 2023-09-19 08:57:15 Sound chip is circled Thank you.
Posted by: imactheknife on 2023-09-19 17:41:29 It is working after I pressed the reset. Sound is only from headphone. So I will need to check the sound chip. Ok, sometimes the little switch in headphone jack gets stuck, so maybe slide headphones in and out to see of that changes anything. Might not either. If your getting sound from headphones thats good though
Posted by: federalfriar on 2024-05-02 07:08:20 I agree with Cam concerning joints, also many traces are a little greenish. I will check for a broken trace (mainly the last one) also U11 LM3080 should be checked for bad joints. I found this to be very helpful to understand why sound was not playing on my LC. My LM3080 chip had come loose in 30 years and needs to be reconnected to the board.
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