CRTs are glorified lightbulbs, so a delayed turn-on is not a CRT failure mode. A CRT dims over time (just like a lightbulb), or can go dark permanently (like a lightbulb). There are more subtle failure modes, to be sure, but generally speaking, most display failures are caused by things other than the CRT. If the screen ever displays something, then the CRT itself is the last thing I would consider. Sounds like an analog-board problem to me (possibly triggered by a flyback that is on its way out).
Post #13 by tomlee59
| Source Forum | What part of the iMac is on its way out now? — #13 |
|---|---|
| Category | Hardware |
| Post Date | Sun, 16 Sep 2007 - 10:47 |
| Original URL | https://68kmla.org/bb/threads/what-part-of-the-imac-is-on-its-way-out-now.9934/ |
Post
CRTs are glorified lightbulbs, so a delayed turn-on is not a CRT failure mode. A CRT dims over time (just like a lightbulb), or can go dark permanently (like a lightbulb). There are more subtle failure modes, to be sure, but generally speaking, most display failures are caused by things other than the CRT. If the screen ever displays something, then the CRT itself is the last thing I would consider. Sounds like an analog-board problem to me (possibly triggered by a flyback that is on its way out).