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Apple 17" Multiscan Monitor problem
- Thread starter Quadraman
- Start date
Simple, my 13.3 apple multiscan stopped displaying red so every was tinted with blue. It's just age and the life of the separate RGB colors.
That was the only CRT that did that to me, other's have simply faded and stopped showing a picture.
That was the only CRT that did that to me, other's have simply faded and stopped showing a picture.
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The red circuitry is driven pretty hard, so that's usually the first to go (as in heavymetal4god's case). An abrupt loss of a color is usually indicative of a circuit problem; a gradual degradation is generally indicative of crt senescence. In your case the crt is likely fine (out-and-out crt failures are rare, in any event).
How well-equipped a home lab do you have? Access to an oscilloscope would be best, but a determined soul could make do with a good voltmeter...
If you are serious about troubleshooting, post back, and folks here can walk you through a procedure.
How well-equipped a home lab do you have? Access to an oscilloscope would be best, but a determined soul could make do with a good voltmeter...
If you are serious about troubleshooting, post back, and folks here can walk you through a procedure.
Ah, sounds like a variation of Pink-Itis, a disease that plagued an LC II's 12" monitor back at Computer Camp 1994!!!
The best advice I have is to check every connection inside your monitor. Not sure if that will help much but it did in the case of one monitor I troubleshot with this problem once.
The best advice I have is to check every connection inside your monitor. Not sure if that will help much but it did in the case of one monitor I troubleshot with this problem once.
Interesting...this particular monitor from 1994 got the "disease" on the first Monday of the two week session. It happened while I was playing Turbo Math Facts on it. Ironically, it happened right when I had solved a problem, with the new problem and the pink screen being displayed at the same time.
For the next two weeks (it was a two week camp sponsored by and held at my academy; I had just finished first grade at the time and all my pals and I attended the two week session) it never went away. We especially liked to fool around with Kid Pix on that screen.
"Pink-Itis" actually should be credited to my teacher, Mrs. H, and not me. She came up with the name and it got in widespread use just like "ImageBanger" has on this forum. (Who did come up with it anyways?)
I got "Pink-Itis" in my 12" RGB a few years later and found that the connector needed jiggled in the back. That took care of it. Perhaps it's a problem in one of the pins that causes this?
LCGuy, your Macintosh Colour Display is the 14" monitor that replaced the Apple Hi-Res 13" RGB, right? (The reason I am wondering is because that display is very similar to the Colour Classic's only bigger if it's the screen I think you have--a Trinitron, in fact--and I'm trying to figure out if it's more common in Trinitrons or if it's just got something to do with Apple connectors since that 12" RGB was NOT a Sony product to my knowledge).
For the next two weeks (it was a two week camp sponsored by and held at my academy; I had just finished first grade at the time and all my pals and I attended the two week session) it never went away. We especially liked to fool around with Kid Pix on that screen.
"Pink-Itis" actually should be credited to my teacher, Mrs. H, and not me. She came up with the name and it got in widespread use just like "ImageBanger" has on this forum. (Who did come up with it anyways?)
I got "Pink-Itis" in my 12" RGB a few years later and found that the connector needed jiggled in the back. That took care of it. Perhaps it's a problem in one of the pins that causes this?
LCGuy, your Macintosh Colour Display is the 14" monitor that replaced the Apple Hi-Res 13" RGB, right? (The reason I am wondering is because that display is very similar to the Colour Classic's only bigger if it's the screen I think you have--a Trinitron, in fact--and I'm trying to figure out if it's more common in Trinitrons or if it's just got something to do with Apple connectors since that 12" RGB was NOT a Sony product to my knowledge).
Yeah, mine's the 14" Trinitron, this one to be exact. Its got a similar tube and guts to the Colour Classic (in fact, IIRC this analog board is used in a "Taco" CC if the builder wishes to retain the original display, as its a stronger board than the CC analog board, does 640x480 unmodified, and plugs straight into the G3 mobo), and the exact same tube and guts as the display in the LC520, 550 and 575 series Macs, as well as the AudioVision 14". Its a good monitor, to be honest, the only thing that could make it better would be if it could handle more than 640x480.
Btw, TRaSh80toG-4 came up with ImageBanger on the original forum way back in 2002.
Btw, TRaSh80toG-4 came up with ImageBanger on the original forum way back in 2002.
According to Steve Bell of the UK who used to post (perhaps still does) in the sci.electronics.repair and comp.sys.mac.* forums of Usenet, the Apple 17" multiscan monitor has three largish surface mount resistors on the circuit board which hangs off the CRT yoke which are not soldered properly. When a color goes out, the first thing to check is whether one of those resistors needs resoldering/replacing. I think they are 330 Ohms, but my memory is leaky.
You may also wish to do a deja-news (Advanced Google Groups) search in the comp.sys.mac.* hierarchy for postings about that monitor by Steve Bell.
You may also wish to do a deja-news (Advanced Google Groups) search in the comp.sys.mac.* hierarchy for postings about that monitor by Steve Bell.
