View Single Post
Old 03-23-2020, 03:00 AM   #2
dicky96
Badcaps Veteran
 
dicky96's Avatar
 
Join Date: Mar 2017
City & State: Sunny Gran Canaria
My Country: Spain
Line Voltage: 220V 50Hz
I'm a: Professional Tech
Posts: 700
Default Re: Help asrock fm2a55m- vg3 missing 3.3v on ram

That motherboard is DDR3 so Vram is 1.5V not 3.3V

There will be a VRM that generates Vram from some other supply, 5V, 3V or 12V

You need to find that supply, it will probably be near the RAM slots

If you cant' find the source of Vram just by lookihng, you can look up the pinout for DDR 3 sockets and trace it from there or you could trace it from the capacitors on DIMMs.

Bear in mind some of the capacitors on the DIMM will be connected to Vref (0.75V) not Vram and one end of all capacitors will go to ground. You could have a short on Vram to ground also

Rich
dicky96 is offline   Reply With Quote