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Dell Optiplex 745 won't turn on
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mohkam3000 [ 10 авг 2015, 17:25 ]
Заголовок сообщения:  Dell Optiplex 745 won't turn on

Got for repair Dell Optiplex 745 almost dead, only led on mobo lights.

SIO : SCH5504-NS - Datasheet seems not to be available on the net.

Voltages measured :
Fnt_panel ICH_PWRBTN : 0V instead of +3V to be released by SB
though: RSMRST =+3.2v, clock signal is ok and supply voltage =+3.3V_AUX
PWR_PS_ON (green wire)=+4.9V
+5VSB ok

Based on SCH5514-NS datasheet available, which seems to be same as SCH5504-NS,
slp_s3 (pin123) and slp_s4 (pin124) measured +3.2V, when only PSU is plugged. It should be +0V, before pushing power button.

When I shunted green wire to gnd continiously, computer boots and displays.

Any help as where to dig further to fix Dell issue.
Wonder whether SB need replacement.

usmankhan [ 29 авг 2015, 10:39 ]
Заголовок сообщения:  Re: Dell Optiplex 745 won't turn on

clean the intel chip and check whit out atx 12v connector

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