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Hi guys.
Working on a 820-00138 board with liquid damage. No green light on adapter.
Cleaned up and replaced U5110 and surrounding components.
PPBUS_G3H - 12.26v
PP3V42_G3H - 3.409v
SMC_BC_ACOK_VCC - 3.409v
SYS_ONEWIRE - 3.387v
Made sure I am using original 85w Magsafe 2 however I only get...
Found R7005 to be blown. Replaced it and the board powered on and then died with in 10 seconds. Green light faded away and PPBUS_G3H short returned until I removed Q7035 again. Something on the circuit is blowing Q7035 and creating a short but I cant figure out what it is.
Replaced U7000 and the FETs all at once. No more short but PPBUS_G3H is only 0.080V. I am not getting a blinking green light on the magesafe.
Resistance between pin 17/18 on U7000 is 3 ohms. Think it should be 2 right ? So I replaced R7051/52. Same results
Resistance between 27/28 is sitting...
Hi Duke.
I confirmed continuity between Q7035/30 and U7000, those traces are good. I took some diode mode readings at U7000 while it was removed. Not sure if these can help.
1 - OL
2 - OL
3 - 1.577
4 - 0.584
5 - OL
6 - 1.020
7 - OL
8 - OL
9 - 1.542
10 - 0.616
11 - 0.616
12 - 0.331
13 - OL
14 -...
Hi Guys.
Working on a 820-3115 with no power no green light. Liquid damaged in the U7000 and Q5480 area.
I replaced both of those components and surrounding caps/resistors.
Found a short on PPBUS_G3H that I tracked down to CHGR_PHASE on Q7035, when I removed it the short went away. I also...
Hi. I am working on a 820-3476 board with no power. All S5 rails are present but missing S4 and below. I found that PM_SLP_S4 is missing so I traced that back to the CPU. Found that PM_PCH_SYS_PWROK is missing. Checked for ALL_SYS_PWRGD is missing as well. Based on schematic, this signal is...
Hi All,
I am working on a Mac Pro 2013 model that is not posting. I found a single corroded component on the CPU riser card that I believe is the culprit. The problem is, I have no board view, schematic or donor boards available for this machine. The component is in the bottom left vicinity of...
Thanks Louis,
I think this might be it.
IHSC
type : current
low-limit: 0.0A
high-limit: 0.05A
Description: Debug TBT T29 Current
Reading: 0.804A
Noise-Tolerance: 1.0
The thing is I worked on that area for a while, meticulously replacing components but I only got one of the ports to work...
I have a 820-3662 that suffered liquid damage. The unit was badly liquid damaged in the eDP connector area, audio and thunderbolt. I removed the damaged components and soldered a new connector. The unit powers on a works fine except the fans always spin at max RPM but only after the OS is...
I have a 820-3476 with no power but orange light on magsafe. Tracked it down to a short PPBUS_G3H under Q7630. When I removed the component, the short is still present and there seems to be soon peeling of the upper layers on the board. See attached picture. Is it salvageable ?
Woke up this morning to find it dead. Now no power at all. Orange light on. SMC_Reset_L present at 3.4V but doesn't seem to go low. Checked R5100 and R5127 and they are both okay.
I have a 820-3437 with no power button. The unit powers on when the charger is connected with the battery plugged in, light goes amber, fan spins and stops 3 times then the system powers up and works as expected. I cannot turn it off or on using the power button. I disconnected the IPD Flex and...
On L5800 I have 5V on pin 1 but nothing on pin 2 Based on schematics and board view I should have a filter there however these just look like test points ? Im confused.
Working on a 820-3115 with no trackpad. Found that PP18V5_Z2 is missing on the connector, confirmed PP3V3_S4_TPAD is present. Traced it to U5805 and found the following readings.
1 - 0.053
2 - 5.07
3 - 0.000
4 - 0.185
5 - 0.001
6 - 0.000
7 - 0.000
8 - 0.037
So I replaced it but having the...
Ok I managed to get everything faster than I thought.
Ran wire from pin 7 on U5110 to Pin 1 of R7100 but even though they are connected I have 0.001 at R7100 and 3.315v on pin 7 of U5110 ? How is this even possible ? confirmed continuity.
a) using known good board and flex
b) pins are in solid...
Went poking around and shorted the magsafe pins killed the magsafe......will get another one and give measurements tomorrow but I can see my old friend U6900 and U6901 on the magsafe board.