On Jun 26, 2010, at 5:11 PM, JOHN CARMONNE wrote: > > On Jun 26, 2010, at 5:05 PM, Jim Scott wrote: > >> >> On Jun 26, 2010, at 4:54 PM, JOHN CARMONNE wrote: >>> >>> I'm going to replace a display in a 17" G5 iMac 1.83 for a friend. this >>> will be the third one for this machine the first one was done by Apple Care >>> at 30 mos, it lasted 7 mos just long enough to be no warranty. So this will >>> be the third one I was wondering if this is a problem other than the >>> display itself? The displays begin growing lines vertically in wide patches. >> >> Could be the bad capacitor problem; could be a bad LCD. If you have an >> identical second iMac you could swap the LCDs to see if the problem travels >> with the LCD. That's what I did last month with an iMac G5 17" (pre-ALS) >> that had several groups of vertical lines. It was the LCD, and after a >> replacement everything's OK. OTOH, I've had iMac G5s with vertical lines >> where the problem was bad capacitors *and* a faulty inverter. I've also seen >> munged up LVDS connectors on the back of the LCD. So pretty much anything is >> possible. >> >> -- Jim Scott > > I don't have another machine to test the display in so I'll have to put in > the new display and I guess kinda hope it's OK, can the display work awhile > and then crap out due to a capacitor problem? Also can the Apple ASD pickup > this defect?
Both ASD (in OS mode) and Apple Hardware Test (should be on the install DVD) are pretty good about catching problems with the video circuitry. However, I just processed an iMac G5 17" ALS which passed both ASD and AHT tests (4 in all) without an error, yet sports one popped/leaking capacitor on the logic board and throws occasional artifacts on the LCD. It also refuses to boot to the desktop and freezes right at the transition from the grey screen to the blue screen. Yet it will boot to the desktop in Safe Mode, which has lower demands on the video circuitry. It's sitting on a shelf awaiting a new batch of capacitors. FWIW, this iMac also chimes on startup, which means it passes POST. So it's worth replacing the 29 caps on the logic board to save it (I hope). Jim -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list
