Macintosh Portable M5120 Backlight Upgrade Repair

[theletter0xff]

Recapping a portable, it happened to have the backlight upgrade installed. I did a thing to it, but hopefully this may help others. My dwell time was too long, I hadn't added enough new solder, so it suffered some delamination and a lifted pad. I need to know a reasonable value for L1, I'm not able to measure it.

C10 and C11 are both 470uF 25v caps.

Attached are scans of the front and back of the depopulated board, oooh, ahh.

 

[theletter0xff]

It chimes, then death chimes.


Sad Mac error code
01000400
0007FFF6

Following http://myoldmac.net/FAQ/SADerror-portable.htm to decode results in ROM test failed, divide by zero. At a guess, there are traces hiding under chips that are bad, or logic chips were zapped by someone trying to power it with a bad battery and the wrong power adapter.

 

[theletter0xff]

Recapped the PSU, it was not the Sony so here are the capacitors:

Macintosh Portable Adapter
M5136 ( SMP-10BB )

7.5V, 1.5A
Limiting to 1.5A

NTC1 400v 56uF 22x25mm, 12mm Snap In 105c

C4 10uF 50v 105c
C303 100uf 25v 85c
C301, C302 1000uF 16v 105c
C505 4.7uF 50v 105c