zing@hpdmd48.boi.hp.com (Blair Elzinga) (01/29/91)
Besides the 'too hot' power supply and video woes I've heard about in this notes group, my mac+ recently developed a similar, but definately different problem: After a couple of weeks of a jittery screen, I turned it on one day to find that the only video output I got was a single vertical line in the middle of the screen. Has anyone had that happen to them? What did you do? -- /--------------------------------------------------------------\ | Blair Elzinga | | ------------------------------ | | | | ---------------------------| | | | Hewlett-Packard | | Boise Surface Mount Center | | 11413 Chinden Blvd | | Boise, ID 83714-1023 | | | | phone : (208) 323-4169 | |----- | \--------------------------------------------------------------/
wnn@ornl.gov (Wolfgang N. Naegeli) (01/31/91)
In article <15590010@hpdmd48.boi.hp.com> zing@hpdmd48.boi.hp.com (Blair Elzinga) writes: > After a couple of weeks of a jittery screen, I turned it on one day to find > that the only video output I got was a single vertical line in the middle of > the screen. I had exactly the same problem. I resoldered the width coil (L1), the yoke plug (J1), and the lin coil (L2). This fixed the problem. There was no visible deterioration of the solder points, but such things are often hard to see. The 3.9uf capacitor at C1 can also cause these symptoms if it goes bad. Replace it with one reated for at least 25 volt. To avoid future trouble, I installed a power supply upgrade kit (which includes a 100 v version of C1 and a heavy-duty flyback transformer, plus several other parts to replace marginal components that often cause trouble) from MicroMat Computer Systems ($50). Their number is 800-829-6227 and they have a free HyperCard catlog stack. ************************************************************** Wolfgang N. Naegeli President, MacClique--East Tennessee Macintosh Users Group Internet: wnn@ornl.gov Bitnet: wnn@ornlstc Phone: 615-574-6143 Fax: 615-574-6141 (MacFax) QuickMail (QM-QM): Wolfgang Naegeli @ 615-574-4510 Snail: Oak Ridge National Laboratory, Oak Ridge, TN 37831-6206 **************************************************************