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MacBook Pro A1502 820-3476-A 2014 - NO DISPLAY
- Thread starter Bockas
- Start date
CHGR_Phase and PPDCIN_G3H_CHGR is shorted on q7130 on all 3 that i have
| 2 | PPDCIN_G3H_CHGR when i measure with q7130 removed voltage drop is 0.574
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Last edited:
What's the problem with Q7155?
We try to fix PPBUS_G3H issue without battery first.
If you measure short between R7120 and L7130, what do you think about Q7130???
We try to fix PPBUS_G3H issue without battery first.
If you measure short between R7120 and L7130, what do you think about Q7130???
I will post measurments on board, q7155 was shorted, after swapping it device is telling to plug the charger for the first time.
On
Reading on board when q7130 off board
Removed q7155
on q7100 pin 3
On
| 1 | PPVBAT_G3H_CHGR_R - steady 20 V |
| 5 | PPVBAT_G3H_CONN - withouth battery no reading |
Reading on board when q7130 off board
| 2 | PPDCIN_G3H_CHGR 0.590 |
| 7 | CHGR_PHASE grows from 0.100 to 0.420 steady |
Removed q7155
| 1 | PPVBAT_G3H_CHGR_R 0.425V drop |
| 4 | CHGR_BGATE 0.625, when you swap leads its slowly growing from 0,600,7,8,9 growing whole time |
on q7100 pin 3
| 3 | CHGR_ACIN is shorted i puted bad chipšp right now obviusly |
Please, check what I said and do not waste time with Q7155.
If you like so much to use lab PSU (which I don't recommend at all in this case), at least set it to 15-16V, instead of 20V.
If you like so much to use lab PSU (which I don't recommend at all in this case), at least set it to 15-16V, instead of 20V.
I said to change Q7130 and U7100 at same time.
Also said to verify something more, before apply power.
Don't forget about power supply and original charger.
Also said to verify something more, before apply power.
Don't forget about power supply and original charger.
Do you get correct PPBUS_G3H voltage now?
Check resistance between pins 17/18 and 27/28 of U7100.
Check resistance between pins 17/18 and 27/28 of U7100.
A missing voltage doesn't mean short.
Where did you find short???
Did you check what I said about U7100 pins?
Also post basic U7100 voltages; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.
Where did you find short???
Did you check what I said about U7100 pins?
Also post basic U7100 voltages; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.
Any reason to quote an entire post visible few centimeters above?
Please maintain forum aesthetic.
The short on D7105, which pin to ground?
Can be U7100, or C7105 problem.
I was expecting to get voltage readings also...
Please maintain forum aesthetic.
The short on D7105, which pin to ground?
Can be U7100, or C7105 problem.
I was expecting to get voltage readings also...
Hi,
I replaced D7105 that diode was problem after replacing device is charging and working normal on battery.
Device works normal and out of the blue screen starts to flicker sometimes, I reflowed connector inside the screen and I didn't get that problem again for now, I tried to post the picture but file is to large.
Any known issue when screen is flickering? On HDMI output is normal so I suppose it is screen problem.
I replaced D7105 that diode was problem after replacing device is charging and working normal on battery.
Device works normal and out of the blue screen starts to flicker sometimes, I reflowed connector inside the screen and I didn't get that problem again for now, I tried to post the picture but file is to large.
Any known issue when screen is flickering? On HDMI output is normal so I suppose it is screen problem.
Flickers only the backlight, or even the image?