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820-2784 wont turn on.. do I need CPU present for S4?

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protocold

Member
CPU is currently removed from a 820-2784 that wont turn on. S5 rails are present and I do see LED1 on.

However, P5VS3_EN is 0v, do I need to put back the CPU for it to turn on? Or can I continue to troubleshoot without the CPU?

The board arrived without heatsink and I dont have the heatsink mount so not sure how to mount the CPU
 
2informaticos

2informaticos

Administrator
Staff member
Some boards have a CPU detection pin on its socket.
Such pin is tied to ground when CPU is inserted.
If not, power on sequence is broken.
 
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protocold

Member
Turns out R2784 is blown open, Q2770 is burnt dark and pin 2 is shorted to ground

Replaced Q2770 removed the short, replaced R2784 as well.

Put back the CPU and ram, but now LED602 blinks.
 
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protocold

Member
no, led601 solid, 602 blinks(try to come on and die and repeat) and others are off. I don’t have graphic card installed.
 
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P

protocold

Member
tested removing ram modules and same symptoms… I don’t have another CPU.. is there other things I can test?
 
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