brunomotter
Member
It pulses to around 100mV. I'm sure it pulses now
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820-00840 Stuck on 5V
- Thread starter brunomotter
- Start date
Remove R7662 and bring 3v3_G3H to P3V3S5_EN.
See if you get stable 3V3_S5.
See if you get stable 3V3_S5.
brunomotter
Member
I jumped 3v3 to Pin 1 of R7662 and still 0V on 3V3_S5
I've said to run the wire to pad 2!
brunomotter
Member
Sorry, my mistake on typing. Was on Pin 2
Remove R7660/61/62 and bring 3V3_G3H to pad 2 of all them.
Then check voltage at L7520/60.
Then check voltage at L7520/60.
brunomotter
Member
Did it. Still no 3V3_S5
Keep the mod and post U7650 voltages; pins 23, 12, 13, 22, 29, 21, 4.
brunomotter
Member
Pin 4 - 3.4V
Pin 12 - 3.4V
Pin 13 - 0.545V
Pin 21 - 3.4V
Pin 22 - 0.911V
Pin 23 - 13V
Pin 29 - 1.477V
Pin 12 - 3.4V
Pin 13 - 0.545V
Pin 21 - 3.4V
Pin 22 - 0.911V
Pin 23 - 13V
Pin 29 - 1.477V
Looks like bad U7501.
Post first diode mode to ground at pins 13, 22, 29.
Also for L7520/60.
Post first diode mode to ground at pins 13, 22, 29.
Also for L7520/60.
brunomotter
Member
I think you had mistaken something. You mean U7650 right? And L7670 and L7690. If so, here it goes:
U7650
Pin 13 - 0.451
Pin 22 - 0.022
Pin 29 - 0.405
L7670 - 0.360
L7690 - 0.335
When I started measuring I found that L7670 was shorted to GND somehow(it was not before), so I went ahead and injected voltage in it and C3000 boiled. I removed it, short gone. So I removed the jumper wire from the board and replaced U7650 and went ahead on diode mode to measure what you asked. Those are the results, but still no power and no 3.3_S5 nor any voltage on L7670
U7650
Pin 13 - 0.451
Pin 22 - 0.022
Pin 29 - 0.405
L7670 - 0.360
L7690 - 0.335
When I started measuring I found that L7670 was shorted to GND somehow(it was not before), so I went ahead and injected voltage in it and C3000 boiled. I removed it, short gone. So I removed the jumper wire from the board and replaced U7650 and went ahead on diode mode to measure what you asked. Those are the results, but still no power and no 3.3_S5 nor any voltage on L7670
Right, I was thinking about 00165 board.
"Pin 22 - 0.022"
Not good; replace C7653 and check again.
"Pin 22 - 0.022"
Not good; replace C7653 and check again.
brunomotter
Member
0.490 now after replacing cap... It's better now as I'm getting steady 3.3V on L7690, still no voltage on L7670 though...
Did you check L7670 voltage with the above mod applied?
brunomotter
Member
Will check tomorrow and post back
brunomotter
Member
Hello! Did the mod again. Now I get steady 5V on L7670, still no power!
So you know U7650 area is good.
Now put back all resistors and remove the wires.
In normal mode, do you get 3V3_S5 now?
Now put back all resistors and remove the wires.
In normal mode, do you get 3V3_S5 now?
Last edited:
brunomotter
Member
Yes I do
Trigger SMC_ONOFF_L and check for pulse at L7670, at same time.
brunomotter
Member
Did it. No pulsing at all!