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820-2936 sometimes green light no power

L

lincev

Member
true R7010 is broken, now i have R7010=9.31k

But I still have no green LED, I have finally decided to raise U7000

I have continuity to ground on pins 17,18,23,28 CHGR__CSO, CHGR_PHASE and CHGR_CSI but I cannot know which component is causing this damage

thank you very much for the immense help
 
2informaticos

2informaticos

Administrator
Staff member
"I have continuity to ground on pins 17,18,23,28 CHGR__CSO, CHGR_PHASE and CHGR_CSI"
Remove Q7030/35 and check again.
 
L

lincev

Member
nice r u the best my Q7035 of the order board is bad.. now I don't have any short and now I have green led

I have tried an SMC bypass or SMC reset with a keyboard but the light does not change green and I still do not have a fan

(all values without fuse)

In fuse I still have 1.6v and a slow countdown to 1v

U7000

Pin1=15,5v
Pin2=16,3v
Pin3=3,94v
Pin9=0v
Pin12=3,44v
Pin13=3,30v
Pin14=2,90v
Pin15=0,11v
Pin17=0,77v (11,9v count down to 0,7)
Pin19=5v
Pin20=0v (3,40v count down to 0v)
Pin27=0v (7v countdown to 0v)
 
2informaticos

2informaticos

Administrator
Staff member
"Pin19=5v - is this steady?
Pin20=0v (3,40v count down to 0v)"
Check R7001 value (ohm scale).

Did you change Q7030 too?
 
L

lincev

Member
change again Q7030, and R7001

U7000 news values

Pin1=15,4v
Pin2=16,1v
Pin3=3,8v
Pin9=0v
Pin12=3,2v
Pin13=3,2v
Pin14=3,1v
Pin15=0,11v
Pin17=0,77v (11,9v count down to 0,7)
Pin19=5v
Pin20=5v
Pin27=16,2v
 
2informaticos

2informaticos

Administrator
Staff member
So your problem is clearly on the U7000 area.

Check R7080/81 and R7085/6 values (onboard, ohm scale) and their traces.
I recommend you to change Q7080/85.
 
L

lincev

Member
hi again, sorry I check all zone, and change again U7000 of the other board now:

i have green light all times

F7040 pin1 PPVBAT_G3H_CHGR_REG= 12,47v

U7000

Pin1=0v (R7086= scale 2M 334ohms and pin2 CHGR_AGATE_DIV= 6,80v)
Pin2=14,41v
Pin3=3,94v
Pin9=0v
Pin12=3,44v
Pin13=3,40v
Pin14=3,28v
Pin15=0v
Pin17=12,54v
Pin19=5,04v
Pin20=5,00v
Pin27=16,32v
 
2informaticos

2informaticos

Administrator
Staff member
"C7040=0,78v
-------------------
F7040 pin1 PPVBAT_G3H_CHGR_REG= 12,47v"
Can you explain???
Please, post accurate information.

Resolder F7040 and check PPBUS_G3H voltage.
 
L

lincev

Member
oh sorry

without F7040 (this have two pins, Obviously on pin 2, since it does not have a fuse, the measurement is 0. I have mentioned this because previously at this point I have always had a voltage of approximately 1.4v-1.6v and now it seems that this IC and cleaning up the U7000 area has improved)


"resolver F7040" With this test I have been able to verify that I have a short in pin2 to ground
 
L

lincev

Member
I have been able to follow the short to R5400, I have removed this item and now I have a short in R5400 2 PPBUS_S5_HS_COMPUTING_ISNS with a value of 014 in diode mode.

In this line I have tried to remove some capacitors and the Q7550 but I have not been able to eliminate the short.
 
2informaticos

2informaticos

Administrator
Staff member
"PPBUS_S5_HS_COMPUTING_ISNS with a value of 014
-------------
L7510/20=015
L7550= 010"
Didn't think you may have a shorted MOSFET in CPU power supply???

"short to ground in all pin´s"
NOT true...
 
L

lincev

Member
sorry for the delay been sick


I don't know but I almost certainly must have a short in mosfet of the CPU.
 
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