hasankilicer
New member
Hey friends, one of my customer brought me Macintosh Portable for recapping few weeks ago. I did ultrasonic cleaning, alcohol bath, replaced all the caps also checked all the paths under the microscope and nothing were corroded then I tested with PDU (top 2 pins +, bottom 2 pins -) with 6.4V and 1.5Amp, hit the keyboard and it didn't turn on.
Since there is no schematics for M5126 model, I decided to check major power components and traced the important voltage lines and everything was okay. I decided to replace one of the capacitors next to the keyboard socket and run my hot air station for a while near the PMGR (U15H) chip. While the board is hot I hit the keys and it turned on with code 00000014, motherboard cool downed to room temp, and tried to turn it on again but no luck. I decided to apply little bit flux around PIN '1-15' area on PMGR and heated with hot air for few seconds and it turned on. Does PMGR failure common problem on this particular machine?
I'm not super familiar with these machines and decided to share here if any case you might have some ideas. I really want to help my customer. Thank you.
Since there is no schematics for M5126 model, I decided to check major power components and traced the important voltage lines and everything was okay. I decided to replace one of the capacitors next to the keyboard socket and run my hot air station for a while near the PMGR (U15H) chip. While the board is hot I hit the keys and it turned on with code 00000014, motherboard cool downed to room temp, and tried to turn it on again but no luck. I decided to apply little bit flux around PIN '1-15' area on PMGR and heated with hot air for few seconds and it turned on. Does PMGR failure common problem on this particular machine?
I'm not super familiar with these machines and decided to share here if any case you might have some ideas. I really want to help my customer. Thank you.