CRT one color (blue) turns on rarely

Jubatian

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Apr 19, 2014
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Hi!

I have an old Eizo Flex Scan F553-M CRT monitor which some months before started losing it's blue component. I like this piece of hardware, so if possible, would like to keep it in operation: it still has a very nice picture (when the blue finally comes up): nothing blurry, geometry all right, just the fine CRT feel (I also like it for that it has a very nice and stable interlace mode).

The colour is not lost permanently: when turning the monitor on, it appears dead, and stays so for a long while (even for a half hour or more), then suddenly it comes up, and from that it works. Patting or gently hitting the monitor does not affect this, neither it is a cable problem: it is certainly a problem within the monitor (the OSD also has blue lost).

Is it reasonably possible to fix it (soldering, replacing some component on a PCB), or it is done for? The monitor is about 20 years old and was in continuous use (I would say to this 20 years it would average 2-3 hours a day of operation).

(I didn't poke in CRT displays before, but have experience with soldering and such, but I might also be willing to pay for someone knowledgeable on this field to fix it once I know it is reasonably possible)
 

ShadiGhabboun

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Mar 31, 2012
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I had the same problem with my Benq CRT monitor
and the beginning it just kepp doing this but after a while the blue will go away permanently but I sent it to a local monitor technician and he managed to repair it ... am not expert in monitors and I really don't know how but he told me I had some capacitors burned and some diodes and he managed to fix it and it working till now ( about 8 months )

hope I helped
 

Jubatian

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Apr 19, 2014
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Thanks for help, meanwhile after some additional research I found this excellent-looking material: http://www.repairfaq.org/sam/monfaq.htm

By this and the symptoms if I am lucky I would except to find some cracked solder joints on the CRT neck board (the blue occasionally still kicks in, and if so, the picture is all right). I put the thing aside for a (longer) while (as it is my parents' stuff, I found a crappy old noname monitor for replacement on the attic), to prepare properly and give it a go later myself, carefully. It would be nice if it could be fixed since this Eizo monitor still has a very pleasant picture, just right for retro games from the 90's and beyond.
 

jeff-j

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Dec 13, 2013
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Based on what you said and the research you did I would also go with cracked solder joints. The reason it take sometimes 30+ minutes for the blue to kick on is depended on how cold the monitor it might take some time for the monitor to warm up on the inside to heat up and expand the cracked solder, and created the connection to turn on the blue. One way to find the trouble area is open the back of the monitor. !!! Be careful because some of the capacitors can so some serious damage to you !!! Turn on the monitor and take a hair dryer or heat gun and heat up spots on the PCB until the blue comes on. This will help you pinpoint the problem area if the solder is cracked.
 

Jubatian

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Apr 19, 2014
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4,510
Thanks, that's especially why I meant "to prepare properly" and "carefully". I also read the safety issues of the Monitor FAQ, kinda wondering how my father is still alive (he managed to grab the tail of the electric eel multiple times even poking around in TV sets, but doesn't care - one day I got to visit home to find some lamps just cut down from the wall, he did it with bare metal scissors. Yuck...). Whenever it was necessary I did repairs on mains voltage equipment; here I will take the advice, and even get the tools necessary for my safety before touching any of the screws holding the cover of that monitor in place.

So true, this stuff is not to be taken lightly.