any one ever do low level monitor repair?- update

[ArkAoss]

i have 2 monitors with low level repairs needed, one we need to replace a capacitor on it, need a place to get shematics, the other has what i think is an issue with its controller, quite frequently it flicks to being very very white/bright, like its lost its v hold or something. if ya smack it enough somtimes it goes back to normal, sometimes it doesnt but then when you leave it alone it goes back to normal. I'd like to fix either of these monitors, any one with expierince let me know, or am i delving into a new field?

Bought 2 monitors to replace them, one of the new ones has a ghosting of every thing displayed. I've seen it in other situation's but on older monitors. has any one else observed anything like that, its not blury, but any high contrast stuff, like text against white background, creats like a ghost image to the right of the text.

 

[ArkAoss]

ahh so i am delving into a new field, or is every one still gone mourning windogg, this place has been slow as anything since he left, some threads haven't moved an inch, I guess it shows people really do like him.

 

[ArkAoss]

any one wanna donate monitor knowledge to my to be made disertation on monitors??

 

[dkozloski]

Sam's Photofacts will get you TV and consumer electronics schematics but monitor schematics are almost impossible to come by. I work at a newspaper where a couple of us have some experience with TV work so we just dink around with the monitors and fix the obvious stuff. The rest go in the landfill. Most of the failures we see are on older stuff that has a multitude of problems anyway such as convergence, focus, sync mode switching and the like anyway. Anybody that has bench time in a TV shop can help you with simple repairs.

 

[jamarno]

See the electronics repair FAQ for general information.

Almost all monitor failures are due to bad connections (cable, solder - solder cracks can be almost invisible), leaking electrolytic capacitors (especially those rated over 80-100 volts), or shorted large chips or large transistors.

A good source of electrolytic capacitors that last longer than the usual 85 deg. Celcius types an be found at Digi-Key, the best being the Panasonic "FA" series, and for high voltage the "EB" series. For some applications, ordinary electrolytics will often fail in less than a year.

B&D Enterprises has a large selection of chips and transistors at low prices. Many parts have substitutes available from NTE and ECG/Philips (many local dealers for each), but they often cost twice as much as the originals.

Use a 40-watt soldering iron (too much heat is a lot better than too little because the job gets done faster), and to remove parts use 0.080" wide copper desoldering braid. Chemtronics gives out free samples of the braid.

Factory repair manuals are sometimes cheaper than Sams Photofacts and contain more information and better schematics. A few companies, like TEAC, will sell just the schematic for much less than a full manual. But many products now have no service manuals available, so you have to rely on information from the makers of the chips used.

What would high level monitor repair be?

Rigoletto, what they told you sounds reasonable. Poor focus that varies can't be adjusted out, and it's related to a high voltage problem (there's a focus voltage in the picture tube), which can be due to a leaking capacitor (the fact that it changes with time indicates this) near the flyback, but sometimes it's the flyback itself because it generates several voltages. Poor focus can also be from an aging picture tube, but that's unlikely.

 

[Rigoletto]

I had a monitor which had poor focus varying around the screen, and got worse the longer it was turned on. I RMAd it. They said it probably had a hitension voltage adjuster (or something) faulty, like bad insulation (it's apparently a coil with waxed paper or something) and would cost £30 as a part. What do you experts think? The monitor was a bargain and I've investigated getting a big reduction in order to get it repaired myself.

 

[ArkAoss]

high level, in the control circuits, but i guess most of that is handled by the video card right?

 

[Dulanic]

I fix monitors alot at work (occasionally get shocked too hehe 🙂 ) As for getting schematics.... call up the company that makes the monitor and tell them you want whatever part #... being a Cap it should be labeled C# like C12 or whatever on the board.... tell them you repair electronics or they sometimes wont sell it to you 🙂 They will rip you off but its better than not fixing it 🙂 As for flickering.... that can be a wide variety of components.

I would say try buying the cap somewhere but the only place I know that would have it is www.digikey.com and they charge $5 for any order under $25 I believe.

 

[ArkAoss]

bump