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Author Topic: A1200 troubleshooting  (Read 1516 times)

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Offline TimTTopic starter

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A1200 troubleshooting
« on: April 01, 2016, 11:48:21 PM »
Hi Everyone

I have two faulty A1200 motherboards one is definitely a Parts board the other I would like to repair.

The board I am trying to repair just displays " random colors " red, green, white, amber, ect.. then reboots. I can confirm power supply, Roms, caps are all ok. The board was tested " bare " no floppy, no Hd ect..

I have the tools to repair this but not the knowledge. can anyone point me in the right direction to troubleshoot this board?
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Offline TimTTopic starter

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Re: A1200 troubleshooting
« Reply #1 on: April 02, 2016, 12:34:50 AM »
Yes there is video out "red, green, white, amber, ect  "

Here is a Video of the computer trying to boot
https://youtu.be/NfkepaXdOYI
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Offline TimTTopic starter

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Re: A1200 troubleshooting
« Reply #2 on: April 02, 2016, 01:21:39 AM »
it probably has displayed all the boot error colors!:lol:
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Offline TimTTopic starter

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Re: A1200 troubleshooting
« Reply #3 on: April 02, 2016, 05:22:31 PM »
floppy power connectors test good. crystal oscillator also is good
Krashan if I can't locate the problem I may try to reflow

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Offline TimTTopic starter

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Re: A1200 troubleshooting
« Reply #4 on: April 04, 2016, 02:46:58 PM »
I did not know about Diagnostic Roms! just ordered everything I need to burn them! Thanks for the information.
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