Power Controller IC on Mobo?

[BigAlNZ]

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.

Interested to know if anyone knows which IC controls the PSU and tells it to turn on?

Thanks


-Al

RT9237 : http://www.alldatasheet.com/view.jsp?Searchword=RT9237
93705CF : http://www.ic2ic.com/search.jsp?sSea...705CF&prefix=9
952001AF : http://www.alldatasheet.com/view.jsp...hword=952001AF
2N03L : http://www.alldatasheet.com/view.jsp?Searchword=2N03L08
LD117 : http://www.st.com/stonline/products/...o/ld1117_1.htm
RT9602 : http://www.alldatasheet.com/view.jsp?Searchword=RT9602

[PCBONEZ]

Re: Power Controller IC on Mobo?

Might be a dumb questions but:
- Did you check the ole 'ON' 'OFF' switch to see if it works?
- Also that the reset switch isn't shorted?

That function is usually integrated into the main chipset on P4 and up.
-
Mobo needs +5vsb present for the function to work.
Are you getting +5vsb to the board before you force-boot it?
-
It's not going to work if you have a shorted cap.
Those OSTs aren't helping you any.
-
Did you check voltages after you had it booted?
That might tell you if a rail has a partial short.
Volts will be low on that rail.
.

[BigAlNZ]

Re: Power Controller IC on Mobo?

Might be a dumb questions but:
- Did you check the ole 'ON' 'OFF' switch to see if it works?
- Also that the reset switch isn't shorted?
.

Yes - On/Off switch is fine.
There is no reset button, but the headers are present on the mobo. They are not shorted.

That function is usually integrated into the main chipset on P4 and up.
.

Which function?

Mobo needs +5vsb present for the function to work.
Are you getting +5vsb to the board before you force-boot it?
.

Yup.

It's not going to work if you have a shorted cap.
Those OSTs aren't helping you any.
.

I have a ESR meter, I can pull em and test em I guess. They all look ok!

Did you check voltages after you had it booted?
That might tell you if a rail has a partial short.
Volts will be low on that rail.
.

Thats a good idea - just tried it and they all seem ok.

Cheers

-Al