Reply 20 of 29, by majestyk
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- Oldbie
That can be very tricky, I had a case recently where a suspicious trace had full continuity when measuring due to the slight pressure of the tips of the measuring probes, but in normal operation it was interrupted. Took me some time also.
For sealing repaired traces I use a lacquer that is used in model making. The brand is "Life Colours", it´s guaranteed to last 15+ years 😉
It can be bought in small amounts like 15 or 30 ml so there´s no risk most of what you bought dries out befoe you can use it.
BTW, this mainboard is extremely picky when it comes to keyboard controllers. The original (defective) chip was a Mitsubishi "M5L8042-146P", I tried several Intel, AMIKEY and NEC chips, but none of them worked 100% correctly. Some reported a keyboard error, some complained about VGA RAM, some would not start witch certain AT-PSUs , some would not work at all.
Finally I tried a "Jetkey 5.0" chip that did not work on countless boards I had tried it on in the past so I thought it was somehow broken, but this one works perfectly on the Modula Tech mainboard.