"PPBUS_G3H fluctuating slightly 15.09-15.5V"
Looks like shorted Q7030, change it.
Be sure R/C7025 are both good, as all traces around U7000.
Looks like shorted Q7030, change it.
Be sure R/C7025 are both good, as all traces around U7000.
-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
A1425 (820-3462-A, I think) with most power rails fluctuating.
- Thread starter joshAU
- Start date
Thanks 2inforaticos.
I appreciate your help, once again.
OK, I desoldered Q7030 and checked the desoldered chip.
All pins/pads on the removed Q7030 show essentially zero ohms resistance, so you were correct re it being shorted.
R7025 shows zero Ohms.
C7025 seems OK.
I did find a tiny bit of corrosion near U7000, primarily on C7000, but otherwise area around U7000 looks good.
I don't think I have the same board to grab a replacement Q7030 from.
I may have to order one in.
I appreciate your help, once again.
OK, I desoldered Q7030 and checked the desoldered chip.
All pins/pads on the removed Q7030 show essentially zero ohms resistance, so you were correct re it being shorted.
R7025 shows zero Ohms.
C7025 seems OK.
I did find a tiny bit of corrosion near U7000, primarily on C7000, but otherwise area around U7000 looks good.
I don't think I have the same board to grab a replacement Q7030 from.
I may have to order one in.
You should find it on other MaBook boards.
Just check schematics of the scrap boards available.
The pin layout is the match you search for.
Just check schematics of the scrap boards available.
The pin layout is the match you search for.
Hi again 2informaticos, and thanks again for your help.
Sorry for the delayed reply - first day back at work since the mid December.
I replaced Q7030 and now have the unit booting.
One thing that isn't working is the left Shift key.
HOWEVER, the SMC correctly resets by pressing the left Shift, Control, Option and power buttons - i.e. the magsafe light changes from orange to green and back to orange, so it must be at least partially working?
However, I notice that it is booting in Safe mode most of the time?
I did an SMC reset and it booted normally, but seems to intermittently boot into safe mode.
I assume that the shift key may be stuck down - although when in OSX, the characters type in lower case unless I press the right Shift?
Once in OSX, after logging in, the red Safe mode up the top right disappears, I only see it on the login screen.
I'm not familiar with safe mode as to whether this is standard behaviour.
Short of replacing the keyboard/kb& top cover, any suggestions?
Thanks again for any help and advice.
Sorry for the delayed reply - first day back at work since the mid December.
I replaced Q7030 and now have the unit booting.
One thing that isn't working is the left Shift key.
HOWEVER, the SMC correctly resets by pressing the left Shift, Control, Option and power buttons - i.e. the magsafe light changes from orange to green and back to orange, so it must be at least partially working?
However, I notice that it is booting in Safe mode most of the time?
I did an SMC reset and it booted normally, but seems to intermittently boot into safe mode.
I assume that the shift key may be stuck down - although when in OSX, the characters type in lower case unless I press the right Shift?
Once in OSX, after logging in, the red Safe mode up the top right disappears, I only see it on the login screen.
I'm not familiar with safe mode as to whether this is standard behaviour.
Short of replacing the keyboard/kb& top cover, any suggestions?
Thanks again for any help and advice.
Search for "keyboard tester" in Google and you will find several webpages for testing all the keys.
I prefer to use
I prefer to use
Hi again 2informaticos.
Thanks for the link to the keyboard tester.
Yes, the left shift doesn't respond.
However using it to do an SMC works, so not sure whats going on there.
Either way, customer is happy to take it as it is - so job closed... for now at least.
Thanks again for your help.
Thanks for the link to the keyboard tester.
Yes, the left shift doesn't respond.
However using it to do an SMC works, so not sure whats going on there.
Either way, customer is happy to take it as it is - so job closed... for now at least.
Thanks again for your help.