Hi guys, here is the latest motherboard I'm trying to fix just for the hell of it
ASUS P5S800-VM
It turns on/off with the ATX power switch, but it doesn't boot (POST 00 on my diagnostic card)
I tried another P4 CPU, no difference
I tried with or without DDR. No difference
I have Vcore 1.4V, Vram 2.6V, 3.3V to the BOIS, 5V, 12V etc. I'm using a known good PSU
I reflashed the BIOS - no difference
From looking around with my scope I think i have no system clock. I'm looking at the RTM363-655 which I am sure is the clock generator. The crystal doesn't seem to be oscillating (just some high frequency noise on one pin probably from the PSU). I have 3.3V supply to this chip. Nothing seems to be happening on the outputs.
I couldn't find the exact datasheet. I found this one https://datasheetspdf.com/pdf-file/7...K/RTM363-210/1 for the RTM363-210
Does anyone know if the -210 and -655 version of RTM63 have the same pin out & functions?
Are these clock generator ICs known to fail?
best regards
Richard
ASUS P5S800-VM
It turns on/off with the ATX power switch, but it doesn't boot (POST 00 on my diagnostic card)
I tried another P4 CPU, no difference
I tried with or without DDR. No difference
I have Vcore 1.4V, Vram 2.6V, 3.3V to the BOIS, 5V, 12V etc. I'm using a known good PSU
I reflashed the BIOS - no difference
From looking around with my scope I think i have no system clock. I'm looking at the RTM363-655 which I am sure is the clock generator. The crystal doesn't seem to be oscillating (just some high frequency noise on one pin probably from the PSU). I have 3.3V supply to this chip. Nothing seems to be happening on the outputs.
I couldn't find the exact datasheet. I found this one https://datasheetspdf.com/pdf-file/7...K/RTM363-210/1 for the RTM363-210
Does anyone know if the -210 and -655 version of RTM63 have the same pin out & functions?
Are these clock generator ICs known to fail?
best regards
Richard
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