Hi,
I would like to ask all of you, experienced eli doctors, for little advice with my faint mobo. Ima just regular home user with DMM and courage.
so in galaxy far aw.......
Ive cleaned and re-pasted my notebook. Was stupid enough to use 10+ years old silver-based paste and possibly spilled something on gfx/cpu parts on their dye. Ive cleaned it as hard as I could.
(acer aspire 5552G) s1s4 socket, phenom cpu, on Rs880m north bridge , dedicated gfx hd5650.
mobo shema
Now mobo switches on for like 3s , diodes shining, fan goin , then it dies. If its cold first-time start it takes like 5 seconds.
It does not get into POST unfortunately (got POST card), therefore bad power is my suspision.
*So Ive tested every rail, for bad voltage levels, found nothing.
*All PowerGood signals are there.
*Ive tryed to push hard BGA chips towards mobo for cold contact, no change.
*None of the caps under cpu/gfx seems shorted.
*Ive found litle trick in manual, when you press some combo on keyboard while pluging power, it enters different BIOS execute branch , where BIOS reads flash drive and re-flashes itself from file. While this "mode" is executed (without flash drive offcourse, dont wanna mess BIOS) , motherboard does not shutoff itself after 3secs , and stays ON untill I pull the plug. Even in this "mode" I didnt found faulty power rail or anything, however NorhtBridge gets hot quite fast , waayyy faster then gfx or cpu (Ive mounted cooling for this).
*Ive soldered out "power jumper" off NB_CORE power rail (heard that Rs880m is shiz), to see if anything changes, dies in 3secs again.
Im courious about some signals, there is logic AND that reads SB_PWRGD (is 1) and strange "LDT_RST" (reads 0V, but inverted output from SB). Dont understand the whole "LDT" / "HDT" abreviation, anyone know?
Unfortunately dont have any logic analyzer or scope , so there I am =S.
Hopefully with little trick , that plugs small diode and capacitor together I would be capable of spoting quick positive signals off rails that could escape DMM. Dunno how would that helped me, but thats it , exhausted and looking for heads up =)
I would like to ask all of you, experienced eli doctors, for little advice with my faint mobo. Ima just regular home user with DMM and courage.
so in galaxy far aw.......
Ive cleaned and re-pasted my notebook. Was stupid enough to use 10+ years old silver-based paste and possibly spilled something on gfx/cpu parts on their dye. Ive cleaned it as hard as I could.
(acer aspire 5552G) s1s4 socket, phenom cpu, on Rs880m north bridge , dedicated gfx hd5650.
mobo shema
Now mobo switches on for like 3s , diodes shining, fan goin , then it dies. If its cold first-time start it takes like 5 seconds.
It does not get into POST unfortunately (got POST card), therefore bad power is my suspision.
*So Ive tested every rail, for bad voltage levels, found nothing.
*All PowerGood signals are there.
*Ive tryed to push hard BGA chips towards mobo for cold contact, no change.
*None of the caps under cpu/gfx seems shorted.
*Ive found litle trick in manual, when you press some combo on keyboard while pluging power, it enters different BIOS execute branch , where BIOS reads flash drive and re-flashes itself from file. While this "mode" is executed (without flash drive offcourse, dont wanna mess BIOS) , motherboard does not shutoff itself after 3secs , and stays ON untill I pull the plug. Even in this "mode" I didnt found faulty power rail or anything, however NorhtBridge gets hot quite fast , waayyy faster then gfx or cpu (Ive mounted cooling for this).
*Ive soldered out "power jumper" off NB_CORE power rail (heard that Rs880m is shiz), to see if anything changes, dies in 3secs again.
Im courious about some signals, there is logic AND that reads SB_PWRGD (is 1) and strange "LDT_RST" (reads 0V, but inverted output from SB). Dont understand the whole "LDT" / "HDT" abreviation, anyone know?
Unfortunately dont have any logic analyzer or scope , so there I am =S.
Hopefully with little trick , that plugs small diode and capacitor together I would be capable of spoting quick positive signals off rails that could escape DMM. Dunno how would that helped me, but thats it , exhausted and looking for heads up =)
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