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. | |
| PowerBook 520, lines on screen, pram batteries | |
| Posted by: jimjimx on 2018-02-19 05:26:34 Does anyone know what causes this, and what will fix it? I pulled it out of storage and wired up a new PSU (IBM 16v 4.5A), and was disappointed to see these lines. The top half was worse, but after squeezing the top edge, it became better than the bottom half. Next, see if I can rebuild the pram batteries with 2025s. (Does anyone know what the pram batteries are?)  | |
| Posted by: techknight on 2018-02-19 10:35:46 That is normal with that type of display. you may need to play with the brightness/contrast a bit to reduce the effect. But chances are, there are capacitors in the display itself that will need checked/replaced. | |
| Posted by: IlikeTech on 2018-02-19 11:18:14 The Service source for the 520 tells you how to get to the PRAM Battery. | |
| Posted by: jimjimx on 2018-02-20 02:19:17 Thanks for the advise. I’ll try to find those caps, and more info on the pram batteries. I know there’s 2 of them. @techknight . In what area should I look for the caps? | |
| Posted by: techknight on 2018-02-20 14:35:22 In the screen itself. There are others on this site that may have documentation to exactly where, but I know it needs caps because I have a monochrome display myself for the 520, and they are leaking. I dont need the display so its sitting in pieces disassembled, rotting away. lol. | |
Posted by: jimjimx on 2018-03-03 15:23:06
| |
| Posted by: MikeatOSX on 2018-04-30 14:09:09 I've written a PowerBook PRAM battery guide, which can be downloaded here: https://www.mediafire.com/download/95msic89udzjigd It's in German, but pictures will tell what should be known. | |
Posted by: gpz500 on 2018-06-29 12:03:46I've written a PowerBook PRAM battery guide, which can be downloaded here:Great document! 🙂 | |
| 1 |