68kMLA Classic Interface
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| Click here to select a new forum. | | Portable and 12 volts !!! | Posted by: falen5 on 2019-03-21 11:28:58
Hey Techknight.
Ive done as you asked.. Good battery, fully charged plugged in.
Pressed and held both nmi and reset together , for 5 seconds
took readings from Q16 and Q20 ( wasnt sure which one you meant)
naming pins 1 to 3 , as you look at them from left to right, with hybrid on bottom left
q16.
1= 2.86 , 2= 5.16, 3= 6.44
after hitting spacebar readings are the same.
Q20
1=5.85 , 2 = 0 , 3 = 6.44
after hitting spacebar readings are the same.
I have a good 6.5 volts on both red wires on battery molex connector.
No heat on any chips anywhere.
I see power going into the pmu
Cant see any voltage going to cpu or roms.
| Posted by: techknight on 2019-03-21 17:49:59
Hybrid is good, you have 5.18V of power regulation.
you are gonna need to find a donor parts board and replace the PMGR IC.
| Posted by: falen5 on 2019-03-21 18:27:29
Darn
wont be easy !!
Thanks Techknight.
| Posted by: CC_333 on 2019-03-22 12:22:49
Does the backlit Portable use the same PMGR IC?
EDIT: I'm pretty sure this is the non-backlit Portable you're talking about here, as that was the only model with the Hybrid.
c
| Posted by: techknight on 2019-04-01 15:18:41
the PMGR chips are the same.
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