How to Know DDR is Ok?

[fauzanmint]

can anyone explain to me how to check points which can state that ddr is broken or not. if I find DDRX_DRAMRST already exists but the laptop doesn't appear on screen it says ddr is broken?

[Th3_uN1Qu3]

Re: How to Know DDR is Ok?

The Chinese sell DDR test cards which are basically a PCB with a 3V battery and a bunch of LEDs. They will tell you if you have an open or short circuit pin in the memory slot.

[piernov]

Re: How to Know DDR is Ok?

From experience these slot testers are hit and miss. Had some boards where it clearly told me there was no contact on some lines (under GMCH rather than caused by the slot itself) since there were LEDs that were off when they were supposed to be on, but also show properly lit LEDs when there was bad contact in the slot and cleaning sometimes was enough to get it back to a working state (and sometimes not, such as the typical bad RAM slot on MBP 13" Unibody 2012, or a MBP 15" 2007 with flex damage).
Still, if a LED is off there's most likely a problem.

[fauzanmint]

Re: How to Know DDR is Ok?

actually i'm working on a mainboard with ddr4 and nand sticking to the mainboard. i found 1.2V0=1.2V
1.2V PWRGD=3.2V
DDR4_DRAMRST#=1.2V VCCCORE =0.89V but
VCCGT is 0
does it mean the ddr on board is broken?

[mcplslg123]

Re: How to Know DDR is Ok?

It seems your ddr ram circuit nad module is fine. VCCGT will come up for a second and then will be zero(if you are measuring with DMM). Better to check on DSO.