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My GS died today

bromaster

Member
Can someone help me and tell me where in A2GS ROM3 the RESET sequence is generated? My computer died today. It shows no activity inside. The oscillators are standing, the integrated circuits are cool or very slightly warm. All voltages are OK... The reset line observed on the oscilloscope during startup is at 0V all the time. Maybe you have some ideas? The computer had been giving signals that something was happening for a long time. Especially in the cold. The image could disappear and reappear after a while, the computer liked to freeze and visit... after a long warm-up period it worked stably. Unfortunately, today was the last time…

Heating the inside of the case with a hairdryer also always helped. I also once reflowed most of IC’s, and it helped for longer. Unfortunately, I am afraid that this is thermal damage to one of the elements. The GLU sound chip had thermal damage, which I managed to repair by heating it up outside the logic board for a longer time
 

Callan

Well-known member
Looks like it's at the ADB chip. The RC circuit at tp74 does the initial reset on powerup (thanks robespierre). The ADB also handles the ctrl-reset. Also... if you haven't done it yet I'd recommend capping your motherboard. One of my rom 3's definetly needed it.
 

bromaster

Member
Looks like it's at the ADB chip. The RC circuit at tp74 does the initial reset on powerup (thanks robespierre). The ADB also handles the ctrl-reset. Also... if you haven't done it yet I'd recommend capping your motherboard. One of my rom 3's definetly needed it.
Unfortunately for this situation, I replaced all capacitors at the very beginning. I understand that I should receive a reset signal from this testopiont? Currently, there is probably some incomplete 5v voltage on
 

Callan

Well-known member
Input to the adb will be high. The adb will then trigger reset low for everything else.
 
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