Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

 
 
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Al Al is offline
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Default Power controller chip to turn on ATX

Hi Guys,

I have got a mobo here that is dead. I have done all the usual stuff
like trying new PSU, bench testing etc. Its dead - as in no fans, no
nothing when you hit PWR button - PSU doesnt even come on.

I connected the ATX molex from the PSU and shorted Green (PWR ON) with
GND on the molex and the PC came on. All seemed fine.

I think there is a IC on the motherboard between the PWR BTN headers
from the power on switch and the ATX header on the mobo that tells PSU
to start up.

I am trying to find this IC.

I have attached a image of the mobo with some of the IC's that seem
possible labelled.

http://www.badcaps.net/forum/attachm...chmentid=12082

Interested to know if anyone knows which IC controls the PSU and tells
it to turn on? Someone else suggested this function was handled on the
CPU since P4, but I am not sure about that.

Thanks

-Al

RT9237 : http://www.alldatasheet.com/view.jsp?Searchword=RT9237
93705CF : http://www.ic2ic.com/search.jsp?sSe...3705CF&prefix=9
952001AF : http://www.alldatasheet.com/view.js...chword=952001AF
2N03L : http://www.alldatasheet.com/view.jsp?Searchword=2N03L08
LD117 : http://www.st.com/stonline/products...fo/ld1117_1.htm
RT9602 : http://www.alldatasheet.com/view.jsp?Searchword=RT9602
 
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