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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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m1823 apple multiple scan 20 diagnosis and repair info
Hello, I have two m1823 20" monitors, very sturdily built that I have
been using past few years. One has had minor display problems with inward arced lines on the sides and dimness and these improved when I smacked it on the side. Thinking it was a poor connection problem I took it outside yesterday and blew all of the dust out of it (it was coated everywhere.) and re-seated most of the connections. That fixed those arcs and the dimness problem and for a day it was perfect and bright. Then suddenly 'click' and the picture was gone, the power and standby lights are flashing and the rightmost light of the 5 on the left is on. When I push the power button again (without cycling power to the monitor), it might work for a minute or two, then 'click' off again this time with the center light of the five being lit & the two power lights flashing. I can hear the HV powering up usually. (static) When I cycle power to the monitor it repeats what I described. What do each of the 5 indicator lights mean when it's in error mode? Does anyone have the MAC software for downloading the presets off of the eeprom? What might be common failure parts for this model? Any schematic out there? Thanks. Andrew |
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#2
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m1823 apple multiple scan 20 diagnosis and repair info
The monitor most likely has some cold solder connections that have to be
located and serviced. Considering the age, there are probably some components in the power supply and scan sections that are wearing down, located, and require to be changed. This type of work will require the proper service manuals, training, and diags equipment to work with. You will have to give the monitor out to an authorized service centre to feasibly service it, unless you are prepared, and equipped to do this type of work. The service mode should not be worked in, until the monitor is in perfect electrical condition. As for the service set-up, this is accessible with the proper factory service interface, and software. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Andrew Kibler" wrote in message ... Hello, I have two m1823 20" monitors, very sturdily built that I have been using past few years. One has had minor display problems with inward arced lines on the sides and dimness and these improved when I smacked it on the side. Thinking it was a poor connection problem I took it outside yesterday and blew all of the dust out of it (it was coated everywhere.) and re-seated most of the connections. That fixed those arcs and the dimness problem and for a day it was perfect and bright. Then suddenly 'click' and the picture was gone, the power and standby lights are flashing and the rightmost light of the 5 on the left is on. When I push the power button again (without cycling power to the monitor), it might work for a minute or two, then 'click' off again this time with the center light of the five being lit & the two power lights flashing. I can hear the HV powering up usually. (static) When I cycle power to the monitor it repeats what I described. What do each of the 5 indicator lights mean when it's in error mode? Does anyone have the MAC software for downloading the presets off of the eeprom? What might be common failure parts for this model? Any schematic out there? Thanks. Andrew |
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m1823 apple multiple scan 20 diagnosis and repair info
On Sat, 01 May 2004 01:21:47 -0400, Andrew Kibler wrote:
Hello, I have two m1823 20" monitors, very sturdily built that I have been using past few years. One has had minor display problems with inward arced lines on the sides and dimness and these improved when I smacked it on the side. Thinking it was a poor connection problem I took it outside yesterday and blew all of the dust out of it (it was coated everywhere.) and re-seated most of the connections. That fixed those arcs and the dimness problem and for a day it was perfect and bright. Then suddenly 'click' and the picture was gone, the power and standby lights are flashing and the rightmost light of the 5 on the left is on. When I push the power button again (without cycling power to the monitor), it might work for a minute or two, then 'click' off again this time with the center light of the five being lit & the two power lights flashing. I can hear the HV powering up usually. (static) When I cycle power to the monitor it repeats what I described. What do each of the 5 indicator lights mean when it's in error mode? Does anyone have the MAC software for downloading the presets off of the eeprom? What might be common failure parts for this model? Any schematic out there? Thanks. Andrew You will not find any schematics, but may find something useful at one of these two sites http://preterhuman.net/texts/computi...e_Service_PDF/ http://home.earthlink.net/~strahm_s/manuals.html Wayne |
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#4
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m1823 apple multiple scan 20 diagnosis and repair info
This is a reply to a no-reply email I got concerning this issue:
Steve, Thank you for your insightful and courteous reply. I do have a little experience at fixing monitors on the side, as I have a degree in electrical engineering. The focus and convergence of these are still good, and in the future by adjusting the focus internally I think there is still some good life in the tube yet. I'll swap out the power supplies and MDB to see which is the culprit. So far I have spent $0 total on these monitors, so it's an interesting exercise anyway. as a grad student I don't have the cash to buy what I'd really like. When it turns off the first time it's not the geometry, but the position LED that is on. I also have a newer Applevision 850 (M3705) that appears to be fine except for a discolored possibly burnt up eeprom on the crt board B67AB 93c66 from National. Is this common for this model and is it repairable? My email address accepts attachments up to 50MB, so that should be no problem. Thanks again! Andrew Andrew Kibler wrote: Hello, I have two m1823 20" monitors, very sturdily built that I have been using past few years. One has had minor display problems with inward arced lines on the sides and dimness and these improved when I smacked it on the side. Thinking it was a poor connection problem I took it outside yesterday and blew all of the dust out of it (it was coated everywhere.) and re-seated most of the connections. That fixed those arcs and the dimness problem and for a day it was perfect and bright. Then suddenly 'click' and the picture was gone, the power and standby lights are flashing and the rightmost light of the 5 on the left is on. When I push the power button again (without cycling power to the monitor), it might work for a minute or two, then 'click' off again this time with the center light of the five being lit & the two power lights flashing. I can hear the HV powering up usually. (static) When I cycle power to the monitor it repeats what I described. What do each of the 5 indicator lights mean when it's in error mode? Does anyone have the MAC software for downloading the presets off of the eeprom? What might be common failure parts for this model? Any schematic out there? Thanks. Andrew |
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Andrew, have you gotten the service manual? I could use it too, because I have a similar problem and would like to see how much repair it needs before I decide on what to do ...
Thank You, Olaf |
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