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Mac classic ii no video sound after recap.

crazyben

Well-known member
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?
 

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bibilit

Well-known member
Look at those legs, the Egret is a sensible chip, i will remove the chip, clean the legs and board and put it back..
 

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crazyben

Well-known member
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.
 

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Cam

Well-known member
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?
 

crazyben

Well-known member
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.
 

bibilit

Well-known member
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.
 

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imactheknife

Well-known member
Sound chip is circled
 

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crazyben

Well-known member
It is working after I pressed the reset. Sound is only from headphone. So I will need to check the sound chip.
 

imactheknife

Well-known member
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
 
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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