vk3heg wrote:
Hello Amiga Experts and Guru's :-D
I've just finsihed making changes to the leads on a 250W PC AT powersupply for my A3000 to go into a tower case from information here Amiga power supply guide. When I switch her on, I get no video on either the 15khz port or the 31khz port (Used a 1084 and my 17" LCD). The A3000 is booting as the install disk for 3.1 get's accessed and goes though the boot process. If I have no disk inserted nothing happens. There are no resister packs on the mb, as I have no hd connected as yet. I have pushed down the chips that have socket's, reseated the zips. Felt the other chips (they are not even warm). Some time ago (couple of months) I removed the battery from the MB.
Can anyone give me some pointers, and before anyone ask's. NO I don't have the orignal powersupply.
Not sure if you did this, but I'll toss it out there. The original A3000 power supply generates a TICK signal for video timing. PC power supplies do not generate this signal, so you have two options.
#1 Build the TICK generation circuitry and connect to pin 13 of the motherboards power supply connector.
#2 Make sure jumper J350 has pins 2-3 connected. This will cause the timing signals to be generated internally instead of getting them from the power supply.
