68kMLA Classic Interface
This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.
| Click here to select a new forum. | |
| Macintosh Portable M5120 doesn't want to boot | |
| Posted by: MrBlanchet on 2025-05-25 10:15:08 Hello there, I've a Mac Portable that has already been recapped some years ago and at the time it was working. I tried to power it on the other day and no way! It just makes a very short noise from the speakers and shows some funky patterns on the screen or other times a black screen and nothing else, no chime, no boot. I've checked visually the board and it seems ok, I tried it with the 9v battery and a new 6v 4.5ah lead acid plugged. What should I try? It's very strange, I was thinking about an Hybrid issue but since it was working after the recap it doesn't make much sense to me... Thanks for your help !  | |
| Posted by: MrBlanchet on 2025-05-27 02:54:01 up! still have not figured out | |
| Posted by: SuperSVGA on 2025-05-27 16:19:42 It sounds like unstable power especially if it's inconsistent in how far it starts up. Are you able to check the +5V rail with a multimeter? | |
| Posted by: Joopmac on 2025-05-30 04:17:27 i had this and it was a via in the corner where the interrupt are.. where the hybrid is on a 5120😉 | |
| Posted by: MrBlanchet on 2025-06-03 10:15:55 thanks for the answers, i managed to make it boot the other day but I’ve discovered while using it that it has a very annoying issue… every time a sound is played (ie when i change the volume or open a game) the mac crashes and reboots! what could it be? i’m guessing some sort of corrosion / shorts on the audio circuit but would like to ask you what should i check… thanks! | |
| Posted by: Joopmac on 2025-06-03 10:32:43 Wash it Some extra times Sometimes I have to wash 2-3x First hot soapy water and nailbrush Then alcohol bath 99% 4-8hr | |
Posted by: MrBlanchet on 2025-06-04 02:56:09Wash it Some extra timesi’ve already used tons of deoxit and ipa… are there some pins to check for shorts? thanks! | |
| Posted by: Joopmac on 2025-06-04 04:57:52 Yeah, it really takes some soaking sometimes and then even 3 times, dont know what crud is dislodged with that | |
Posted by: MrBlanchet on 2025-06-04 11:28:53Yeah, it really takes some soaking sometimes and then even 3 times, dont know what crud is dislodged with thatso I just cleaned another time the board and nada, It playes audio 1 out of 10/15 times, I'm starting to hypotize that it could be an hybrid issue, playing audio drains pretty much current from the battery and this plus a faulty hybrid makes the computer to crash/reboot | |
| Posted by: Joopmac on 2025-06-04 11:31:08 Very much possible, i have 3x 5120 that are acting weird and up for new hybrid http://jcm-1.com has them in stock nowadays, thats great | |
| 1 |