Mac classic ii no video sound after recap.

[crazyben]

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?

 

[bibilit]

The Egret, legs are a bit tarnished

 

[crazyben]

I can’t see anything wrong. What am I missing?

 

[bibilit]

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

 

[imactheknife]

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.

 

[crazyben]

Got it. I will do that. And let you know.

 

[crazyben]

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.

 

[Cam]

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]

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]

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.

 

[Cam]

I measure the voltages at the port in the back.

 

[imactheknife]

Sound chip is circled

 

[crazyben]

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

 

[crazyben]

Sound chip is circled

Thank you.

 

[imactheknife]

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

 

[federalfriar]

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.