[SOLVED]820-2879 no lcd enable

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jgraffis

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i've got this 820-2879 that was missing the lcd_ig_pwr__en coming from the u9000. i checked r9014 and it is good with 1kohm resistance with still no voltage going threw. Im guessing there is a problem with u1400 either not powering on or just not good anymore.

the other thing is when i plug in a usb optical mouse it doesn't turn the light on for it. so may be something going on with the processor?
 

jgraffis

New member
CPU vcore is at 1.16v, not sure if it chimes being its out of the case right now. will see if it chimes in case and do pram reset.

cpu vcore seems a little low but close.
 

dukefawks

Administrator
1.15V is high for Vcore. A good board will start at 1.15 and then drop down to 0.99V. Connect a speaker and see if it chimes or beeps.
 

jgraffis

New member
so I'm measuring ppvcore_s0_cpu_reg at pin 2 at L7400. could it be that the q7401 is not working properly which is creating more voltage than its supposed to? or am i way off?
 
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