Capacitor on last legs in Trinitron screen
Got a 20" trinitron screen that takes ages to turn on. Everything I read
seems to point to a dying capacitor, probably one of the filter capacitors being dried up, or some other capacitor in the power supply. If open it up, how easy will it be to find this capacitor? What should I look for? How should I go about testing it? Thanks in advance! -Dan |
Capacitor on last legs in Trinitron screen
Post the rest of the missing required information for a response.
model number, ACTUAL symptoms, etc. David "DS" wrote in message ogers.com... Got a 20" trinitron screen that takes ages to turn on. Everything I read seems to point to a dying capacitor, probably one of the filter capacitors being dried up, or some other capacitor in the power supply. If open it up, how easy will it be to find this capacitor? What should I look for? How should I go about testing it? Thanks in advance! -Dan |
Capacitor on last legs in Trinitron screen
"DS" writes:
Got a 20" trinitron screen that takes ages to turn on. Everything I read seems to point to a dying capacitor, probably one of the filter capacitors being dried up, or some other capacitor in the power supply. If open it up, how easy will it be to find this capacitor? What should I look for? How should I go about testing it? If someone happens to know which capacitor(s) tend to fail in that set, then replacing them all should fix it. Otherwise, someone will have to test each capacitor. This is generally done with an ESR meter. It's quick and painless but you need the proper equipment. More in the FAQs. --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header is ignored. To contact me, please use the feedback form on the S.E.R FAQ Web sites. |
Capacitor on last legs in Trinitron screen
A common symptom of Sony tv's as they get older is the PICTURE TUBE cathode
emissions are lower, and the picture is blanked by the microprocessor until the picture is considered watchable. If the picture is still somewhat pastel-looking after it comes on, this is your problem, a bad picture tube. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "DS" wrote in message ogers.com... Got a 20" trinitron screen that takes ages to turn on. Everything I read seems to point to a dying capacitor, probably one of the filter capacitors being dried up, or some other capacitor in the power supply. If open it up, how easy will it be to find this capacitor? What should I look for? How should I go about testing it? Thanks in advance! -Dan |
Model, symptoms, etc
"David" wrote in message ... Post the rest of the missing required information for a response. model number, ACTUAL symptoms, etc. David Hi David, here is what I posted over in sci.electronics.misc.. the only thing that needs to be added is that the model is Dell D2026T, but it is based on a a Sony Trinitron tube. Thanks. ------------------------- I've got a 20" Dell Trinitron CRT screen thats about 7 years old. Its been going great until December when it started to take about 10 minutes to warm up. Well now its up to almost half an hour. Here's what happens: I push the power button (its a hard on/off; not a standby); the green LED comes on and it degausses. It is then pitch black (you know how normally when it is black it still has a some output.. not anymore). It will remain pitch black without any sign that is alive (aside from the LED) for about half an hour, then it suddenly comes to life in the span of 20 seconds (from pitch black to a bright vibrant image). If it flicks off into power standby mode even for a second (like when you reboot for example), it will then be black for another 10 minutes before it fades the image in (once again, 10mins of pure black, then a 20 second warm up). I don't think the tube is worn out since once its finished warming up it works as well as day one.. I'm guessing its something to do with the electronics.. any ideas what it may be? Thanks in advance! -Dan (rem.ove no junk mail) |
Capacitor on last legs in Trinitron screen
"Mark D. Zacharias" wrote in message ... A common symptom of Sony tv's as they get older is the PICTURE TUBE cathode emissions are lower, and the picture is blanked by the microprocessor until the picture is considered watchable. If the picture is still somewhat pastel-looking after it comes on, this is your problem, a bad picture tube. Mark Z. Hi Mark, I suppose that is a possibility, is there any way I can find out if that is the problem? From what I read in the FAQs and the answers I got over in sci.electoronics.misc, it was suggested that it is probably a bad capacitor, but that could be wrong. IIRC it was made in 1997. I bought it second hand in '99. While I use it, it generally gets about 8 hours of use during the day; I shut it off at night and when I'm not at my desk for more than about 20 minutes I set it to go into powersaving (CRT off). Right now, once it actually finishes warming up, the picture is crisp and vibrant. The CRT has definately had some wear as the brightness and contrast are set up at 100% and its still not as bright as a new screen, but it is more than ample to do programming and graphic editing as the colors still appear pretty accurate and not washed out. -Dan |
Capacitor on last legs in Trinitron screen
Um, this person is Daniels Stern who resells and advises on automative lights. By the way, Sony sets are famous for solder joint problems and capacitors sometimes depending on models. Model number please? Cheers, Wizard Nope, I'm not Daniels Stern, and I know next to nothing about auto lights :-) Its a rebranded trinitron, the exact model is Dell D2026T. HP also had a rebrand of the identical monitor, and I've noticed a few other people have been posting to this newsgroup with problems, though I cannot verify if they are the exact same innards, but most refer to the 20" HP (using trinitron tubes). Unfortunately I haven't read anyone else having the same problem as me, others seem to have issues with focus failing or sync errors. I guess this model is giving up its ghost right about now. All the same, if I can fix it for a few bucks to have it last another year or two, that would be fantastic. Thanks, Dan |
Capacitor on last legs in Trinitron screen
"DS" wrote in message news:5sFMc.1206528
Its a rebranded trinitron, the exact model is Dell D2026T. HP also had a rebrand of the identical monitor, and I've noticed a few other people have been posting to this newsgroup with problems, though I cannot verify if they are the exact same innards, but most refer to the 20" HP (using trinitron tubes). Unfortunately I haven't read anyone else having the same problem as me, others seem to have issues with focus failing or sync errors. I guess this model is giving up its ghost right about now. All the same, if I can fix it for a few bucks to have it last another year or two, that would be fantastic. Thanks, Dan Not all monitors with Trinitron tubes are made by Sony. Sony sold the Trinitron tubes separately (or at least they did until recently) to many other monitor manufacturers. I still have a 15 inch Nokia (manufactured by Nokia) that has a Trinitron tube made by Sony. Of course, Sony could have made the entire monitor (I don't know), but I know that they sold the tube by itself also. The Trinitron patent has expired, so there are other manufacturers who now make shadow mask tubes. I had a Sony 20 inch professional monitor that had similar symptoms as yours, and it recently went blank. If you live near San Diego (where the Sony repair facility is) they will repair if for a fixed fee of about $400 (they will probably fix the lack of brightness and contrast also). However, I recently bought a new high end 19 inch monitor for about $325 that is extremely sharp and bright. You can get mainstream 19 inch monitors for about $250. |
Capacitor on last legs in Trinitron screen
"Mark A" wrote in message ... "DS" wrote in message news:5sFMc.1206528 Its a rebranded trinitron, the exact model is Dell D2026T. HP also had a rebrand of the identical monitor, and I've noticed a few other people have been posting to this newsgroup with problems, though I cannot verify if they are the exact same innards, but most refer to the 20" HP (using trinitron tubes). Unfortunately I haven't read anyone else having the same problem as me, others seem to have issues with focus failing or sync errors. I guess this model is giving up its ghost right about now. All the same, if I can fix it for a few bucks to have it last another year or two, that would be fantastic. Thanks, Dan Not all monitors with Trinitron tubes are made by Sony. Sony sold the Trinitron tubes separately (or at least they did until recently) to many other monitor manufacturers. I still have a 15 inch Nokia (manufactured by Nokia) that has a Trinitron tube made by Sony. Of course, Sony could have made the entire monitor (I don't know), but I know that they sold the tube by itself also. The Trinitron patent has expired, so there are other manufacturers who now make shadow mask tubes. I had a Sony 20 inch professional monitor that had similar symptoms as yours, and it recently went blank. If you live near San Diego (where the Sony repair facility is) they will repair if for a fixed fee of about $400 (they will probably fix the lack of brightness and contrast also). However, I recently bought a new high end 19 inch monitor for about $325 that is extremely sharp and bright. You can get mainstream 19 inch monitors for about $250. Oops. I should have said (I think): The Trinitron patent has expired, so there are other manufacturers who now make aperture grill tubes. |
Capacitor on last legs in Trinitron screen
The Trinitron patent has
expired, so there are other manufacturers who now make shadow mask tubes. Don't you mean aperture grille tubes. And, so far, I only know of at least three manufacturers that make tubes based on Trinitron, but not totally copying it. Mitsubishi, NEC, and Viewsonic. But, Sony still makes the best, IMO. No other CRT uses the LSAGIC electron guns. - Reinhart |
Capacitor on last legs in Trinitron screen
The Trinitron patent has
expired, so there are other manufacturers who now make shadow mask tubes. Don't you mean aperture grille tubes. Yes, I corrected myself in a subsequent post. And, so far, I only know of at least three manufacturers that make tubes based on Trinitron, but not totally copying it. Mitsubishi, NEC, and Viewsonic. But, Sony still makes the best, IMO. No other CRT uses the LSAGIC electron guns. - Reinhart You are probably right, but when it comes to computer monitors, technology investment in direct view monitors has probably come to an end with the advent of flat panel LCD monitors. I recently wanted a 19-20" direct view Sony monitor to replace my 20" Sony that died, but could not even find one for sale. They still make a 21 inch $1800 professional direct view monitor, but that is way too much money (and too heavy IMO). I ended up with a 19 inch Viewsonic P90f that is very sharp and cost about $325. It is not exactly the same as the aperture grill, but is a hybrid technology. |
Capacitor on last legs in Trinitron screen
"Mark A" wrote in message ... "DS" wrote in message news:5sFMc.1206528 Its a rebranded trinitron, the exact model is Dell D2026T. HP also had a rebrand of the identical monitor, and I've noticed a few other people have been posting to this newsgroup with problems, though I cannot verify if they are the exact same innards, but most refer to the 20" HP (using trinitron tubes). Unfortunately I haven't read anyone else having the same problem as me, others seem to have issues with focus failing or sync errors. I guess this model is giving up its ghost right about now. All the same, if I can fix it for a few bucks to have it last another year or two, that would be fantastic. Thanks, Dan Not all monitors with Trinitron tubes are made by Sony. Sony sold the Trinitron tubes separately (or at least they did until recently) to many other monitor manufacturers. I still have a 15 inch Nokia (manufactured by Nokia) that has a Trinitron tube made by Sony. Of course, Sony could have made the entire monitor (I don't know), but I know that they sold the tube by itself also. The Trinitron patent has expired, so there are other manufacturers who now make shadow mask tubes. I had a Sony 20 inch professional monitor that had similar symptoms as yours, and it recently went blank. If you live near San Diego (where the Sony repair facility is) they will repair if for a fixed fee of about $400 (they will probably fix the lack of brightness and contrast also). However, I recently bought a new high end 19 inch monitor for about $325 that is extremely sharp and bright. You can get mainstream 19 inch monitors for about $250. at one point I had the specs, and I think this tube was made by Sony. There are many places that will fix it for far less than that amount, but anything more than $50 really isn't worth it. At this point I'm eyeing a 20" LCD panel, but they're just too dang expensive for me right now. Thats why if I can coax this screen to work for another year or two I could probably afford the 20" LCD. If its just a simple capacitor fix though, I should be able to do it myself, and thats why I'd like to get any input about fixing it ;) -Dan |
Capacitor on last legs in Trinitron screen
Try adjusting the screen adjustment on the flyback transformer to get a
little more juice from the tube. Ought to work for a while. There's 2 adjustments on a common flyback transformer. One for focus, the other for "screen". There's probably raised black lettering near each adjustment. Re-adjusting the focus at this point would probably also help. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "DS" wrote in message t.cable.rogers.com... "Mark A" wrote in message ... "DS" wrote in message news:5sFMc.1206528 Its a rebranded trinitron, the exact model is Dell D2026T. HP also had a rebrand of the identical monitor, and I've noticed a few other people have been posting to this newsgroup with problems, though I cannot verify if they are the exact same innards, but most refer to the 20" HP (using trinitron tubes). Unfortunately I haven't read anyone else having the same problem as me, others seem to have issues with focus failing or sync errors. I guess this model is giving up its ghost right about now. All the same, if I can fix it for a few bucks to have it last another year or two, that would be fantastic. Thanks, Dan Not all monitors with Trinitron tubes are made by Sony. Sony sold the Trinitron tubes separately (or at least they did until recently) to many other monitor manufacturers. I still have a 15 inch Nokia (manufactured by Nokia) that has a Trinitron tube made by Sony. Of course, Sony could have made the entire monitor (I don't know), but I know that they sold the tube by itself also. The Trinitron patent has expired, so there are other manufacturers who now make shadow mask tubes. I had a Sony 20 inch professional monitor that had similar symptoms as yours, and it recently went blank. If you live near San Diego (where the Sony repair facility is) they will repair if for a fixed fee of about $400 (they will probably fix the lack of brightness and contrast also). However, I recently bought a new high end 19 inch monitor for about $325 that is extremely sharp and bright. You can get mainstream 19 inch monitors for about $250. at one point I had the specs, and I think this tube was made by Sony. There are many places that will fix it for far less than that amount, but anything more than $50 really isn't worth it. At this point I'm eyeing a 20" LCD panel, but they're just too dang expensive for me right now. Thats why if I can coax this screen to work for another year or two I could probably afford the 20" LCD. If its just a simple capacitor fix though, I should be able to do it myself, and thats why I'd like to get any input about fixing it ;) -Dan |
Capacitor on last legs in Trinitron screen
when it comes to computer monitors, technology
investment in direct view monitors has probably come to an end with the advent of flat panel LCD monitors. Even so, I'd rather have a CRT monitor over an LCD. They still can quite deliver an image that's acceptable, IMO. It is a pity that it's become hard to locate a Sony monitor that isn't too big for practical home use, but there are still other choices that are decent for CRT displays, as you've chosen with a ViewSonic. - Reinhart |
Capacitor on last legs in Trinitron screen
On Sun, 25 Jul 2004 00:33:24 GMT, "DS"
wrote: Got a 20" trinitron screen that takes ages to turn on. Everything I read seems to point to a dying capacitor, probably one of the filter capacitors being dried up, or some other capacitor in the power supply. If open it up, how easy will it be to find this capacitor? What should I look for? How should I go about testing it? Thanks in advance! -Dan Um, this person is Daniels Stern who resells and advises on automative lights. By the way, Sony sets are famous for solder joint problems and capacitors sometimes depending on models. Model number please? Cheers, Wizard |
Capacitor on last legs in Trinitron screen
On Sun, 25 Jul 2004 03:05:37 GMT, "DS"
wrote: Um, this person is Daniels Stern who resells and advises on automative lights. By the way, Sony sets are famous for solder joint problems and capacitors sometimes depending on models. Model number please? Cheers, Wizard Nope, I'm not Daniels Stern, and I know next to nothing about auto lights :-) Its a rebranded trinitron, the exact model is Dell D2026T. HP also had a rebrand of the identical monitor, and I've noticed a few other people have been posting to this newsgroup with problems, though I cannot verify if they are the exact same innards, but most refer to the 20" HP (using trinitron tubes). Unfortunately I haven't read anyone else having the same problem as me, others seem to have issues with focus failing or sync errors. I guess this model is giving up its ghost right about now. All the same, if I can fix it for a few bucks to have it last another year or two, that would be fantastic. Thanks, Dan Whoops. Thought this was the guy I saw on other newsgroups. By the way, every Sony-made monitors I come across that were relabelled for other OEMs always had chassis number on back that begins with "SCC-...." Cheers, Wizard |
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