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Dell Optiplex 745 won't turn on https://vlab.su/viewtopic.php?f=277&t=35106 |
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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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