Hello, I recently got this apple IIc Plus. When I turn it on, the screen shows characters in red/blue color instead of white.
It sometimes shows white characters, but after a few seconds, it switches back.
How can I fix this? Please help me.
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It can be the video chip, but most likely is your cable or monitor brand.Is that an original Apple monitor? try another cable or monitor.
There's also a cable yoy can make to use with LCD:https://www.youtube.com/watch?v=wQaouPzMSsI
This is clearly a RAM or video logic issue. Some chip needs to be replaced. Many of the random and replaced characters indicate that bit 3 (=0x08) is stuck to 0 (this results in replacing "I" (=0x73) with "A" (=0x65), "O" (0x79) with "G" (0x71) etc.
Try to run the diagnostics and see if you're "lucky" and any RAM is defective. Otherwise you'll need to dive in deeper to investigate the video logic.