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ianoid

Need repair advice

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I have a TI-99/4 yes 4 that starts up to this kind of messed up screen. Is it RAM or other chips? What should I replace first?

A4B8F591-638C-4743-AA94-25ABE3812453.jpeg

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This happens to me, far too frequently, especially after I move the monitor from one location to another...

Surprisingly, this is a quick fix... all you have to do is: Rotate the monitor, 90 degrees.:-D

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Lotta RAM swapping solved the problem although it didn't fit into any of the screen shots. Thanks and sorry for not FAQing the group. I was afraid it was something else that would be spotted by the wise eyes of the TI masters. 

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Was the problem a single RAM chip or multiple?

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3 hours ago, OLD CS1 said:

Was the problem a single RAM chip or multiple?

Advice to find defective ram chips: If you want to find a defective RAM-Chip set a good 4116 in piggyback above each chip. If the error is gone you are at the defective one.

But you should test if there are more ram chips defective. Watch out that you put the test-ramchip in the right direction on the others.

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