Macintosh IICi No chime and blackscreen

[croissantking]

This is the board as it sits now

These looks like originals. Are they?

 

[Elv1s]

View attachment 69681
These looks like originals. Are they?

No, all caps are changed from new stock

 

[Elv1s]

The three 74HC logic chips, right? In my case the middle one failed without any visible signs of corrosion. I even desoldered it, cleaned up all the traces and re-soldered it down. I am sure it was killed by cap goo.

The chips looks to be fine, little to none corrsion.

 

[Elv1s]

Can we see hi res photos of the logicboard please

Over

 

[Elv1s]

under

Can we see hi res photos of the logicboard please

 

[JC8080]

If you have a hot air gun, great. Otherwise, I recommend ChipQuick desoldering solder. Yes, it is expensive. So, get the smallest amount you can. It is useful in almost any stubborn electronics situation. It is just solder with a low melting point, so it stays molten long enough to 'float' off the chip with just a soldering iron.

I keep ChipQuik around as a standby, it does work well in many situations, you can buy a small kit from Amazon (link) for $11.95. Personally, I recommend picking up a hot air station, I bought mine from Amazon for $40 (link). I'm sure there are better ones out there, but this one has adjustable temperature and fan speed, as well as swappable nozzles. I end up using it quite often. If you will be removing the type of SMD ICs with the legs that curl underneath, I believe a hot air station is necessary. I tried ChipQuip on that style of chip once with no success, though other people may have different experiences.

 

[Elv1s]

I keep ChipQuik around as a standby, it does work well in many situations, you can buy a small kit from Amazon (link) for $11.95. Personally, I recommend picking up a hot air station, I bought mine from Amazon for $40 (link). I'm sure there are better ones out there, but this one has adjustable temperature and fan speed, as well as swappable nozzles. I end up using it quite often. If you will be removing the type of SMD ICs with the legs that curl underneath, I believe a hot air station is necessary. I tried ChipQuip on that style of chip once with no success, though other people may have different experiences.

I have all the tools (not including an oscilloskope)