Dell e6500 no ram and system shutdown

[usyusy]

Del e6500 power on but after a few second power off, ram voltage and vtt not generating, while 3v/5v, 1.0 Ich, 3v sus, vcore were generating

Ram ic pin 9, 14, 15, 16 have 5v inputs, s4 enable (DDR_ON) is 2.5v, s3 enable ( 0.9V_DDR_VTT_ON) is 3.3v

No bios yet flashed, any suggestions
MOD Edit: Link to Schematic ---> https://www.badcaps.net/forum/showthread.php?t=121606

[Vesko356]

Re: Dell e6500 no ram and system shutdown

Do not attach laptop schematic and/or BV in this section please!

Schematic Requests ONLY!
https://www.badcaps.net/forum/forumdisplay.php?f=41

Reminder: rules and organization of this section
https://www.badcaps.net/forum/showthread.php?t=117483

If you request/offer BIOS/schematics/boardviews, please post in the appropriate subsection, and you can link to it in the troubleshooting topic.

.

[mcplslg123]

Re: Dell e6500 no ram and system shutdown

Vcore unlikely to rise without ram voltage present. Re check your measurement.

[usyusy]

Re: Dell e6500 no ram and system shutdown

Vcore unlikely to rise without ram voltage present. Re check your measurement.

you are right sir, but don't know what happened, DDR_on now 3.3 and ram generated, core, gfx, pltrst is present but before display, board gets-off. also dc to dc voltages are present when powered-on

[raajkumar]

Re: Dell e6500 no ram and system shutdown

Did you check how much ampere is getting switched on time. and you have to observe the amp when its switch on and off.

[usyusy]

Re: Dell e6500 no ram and system shutdown

Did you check how much ampere is getting switched on time. and you have to observe the amp when its switch on and off.

when power-on, takes about 800 mA, and when off takes about 0.02A

[Sephir0th]

Re: Dell e6500 no ram and system shutdown

VCC_GFX present before the P.O.S.T succesful performed is a odd observation. Could be a hint into the direction of dead CPU

[mcplslg123]

Re: Dell e6500 no ram and system shutdown

DRAMRST# status?