Retrologist
Member
Hi, I’m hoping you guys will be able to help me!
I recently bought a Mac Plus for cheap. I enjoy repairing and tinkering with old machines but have never owned an old Mac before.
This machine produces a checkerboard pattern and makes one deep tone upon boot.
I also acquired a second cheap broken machine in an attempt to make one good one. This one actually booted at first. However, now I get the correct tone and just a black screen.
I have two working analogue boards and the problems remain the same when I switch the logic boards. This means it must be the logic boards with faults.
Board 1 (checkerboard)
so far I have replaced the roms, replaced the rom sockets, replaced the ram, contact cleaned the ram sockets, tried two sticks (and moved the resistor), reflowed anything that looked iffy. No luck so far.
board 2 (no image)
This board occasionally works. I think this is when the machine has been turned off for a while. I have removed and replaced the solder along the connector to the motherboard.
I just want to get one of my logic boards working so that I can enjoy getting into the classic Mac!
I recently bought a Mac Plus for cheap. I enjoy repairing and tinkering with old machines but have never owned an old Mac before.
This machine produces a checkerboard pattern and makes one deep tone upon boot.
I also acquired a second cheap broken machine in an attempt to make one good one. This one actually booted at first. However, now I get the correct tone and just a black screen.
I have two working analogue boards and the problems remain the same when I switch the logic boards. This means it must be the logic boards with faults.
Board 1 (checkerboard)
so far I have replaced the roms, replaced the rom sockets, replaced the ram, contact cleaned the ram sockets, tried two sticks (and moved the resistor), reflowed anything that looked iffy. No luck so far.
board 2 (no image)
This board occasionally works. I think this is when the machine has been turned off for a while. I have removed and replaced the solder along the connector to the motherboard.
I just want to get one of my logic boards working so that I can enjoy getting into the classic Mac!