| Suresh Garikipati <garikipati2000@gmail.com>: Sep 01 08:51AM -0700 What might be the problem of the below linked images lcd tv how to solve this problem - 1. Is this screen problem or 2. Display power inverter problem KIndly help me out to find the issue https://photos.google.com/search/_tra_/photo/AF1QipMVUoACHpXyqNf9v0th6h4KwIfMNiPyEjbI9zRh https://photos.google.com/search/_tra_/photo/AF1QipOtgilsiXQSdY27nAH7ughl1d4vxKV8kmvUERs2 https://photos.google.com/search/_tra_/photo/AF1QipOd_zERdrzik-x_nhFe3sNIemLj-XbZ0xsqYNpi |
| "Ian Field" <gangprobing.alien@ntlworld.com>: Aug 31 09:56PM +0100 <mhooker32@gmail.com> wrote in message news:b1c9e204-53fc-45a4-9a12-26070894de62@googlegroups.com... > like to hook up a desktop vga monitor. > i posted an image from the slot schematics here: > http://s408.photobucket.com/user/mhooker32/library/VGA%20interface It sounds like a phasing problem - its a simple fault to fix, but not simple to find the part. Usually; the phase is sampled from a winding on the horizontal transformer. There's usually a high resistor in series with that signal on its way to the horizontal oscillator. If that's in a chip - its usually easy to trace the path to the transformer. Another possibility is the scan energy recovery system, the left to centre part of the scan is driven by recovered energy - the horizontal transistor drives from centre to RHS, the energy is recovered at the end of that. A fault there usually causes cramping (horizontal linearity) but early onset faults can distort the waveform back to the phase discriminator. |
| whit3rd <whit3rd@gmail.com>: Aug 31 04:44PM -0700 > > whatever signals it outputs, rather than looking at EDID data the way a > > PC would. > will that affect what i'm trying to do? Maybe; the video MODE information never gets confused when the ID pins are read, but if those AREN'T in use, the video output and the sync signals might be misinterpreted as the entirely wrong sync rate, or resolution. The description of the picture being offcenter of the screen does sound like a mode mismatch between monitor and video 'card'. So, the monitor walks the picture off the left screen edge at 5 milliseconds, but the picture isn't completely sent until 8 milliseconds. The monitor just decided on the wrong horizontal sweep rate. In the early days of multisync monitors, Apple and IBM and third parties all did the timing according to whims. Adaptation was a BIG issue. |
| Jeff Liebermann <jeffl@cruzio.com>: Aug 31 08:07PM -0700 >i made up the cable as per jeff's chart, and the lcd monitor displayed >a very nice image. now i can go thru the machine and test all its >functions. Very good. >with the image on the original monitor as described above, do you >think a cap kit will do the trick? Of course, why else would I suggest it? I haven't fixed CRT monitor for at least 6 years. I didn't even know that there were re-cap kits available for CRT monitors. However, if it's anything like LCD monitors, replacing the caps will usually do the trick. Electrolytics don't last forever. You might need to look into replacing the flyback if you can't get any hi-V and the rest of the horizontal sweep circuitry seems to be ok. Hard to tell from here. Also, CRT's are potentially dangerous and can zap you without much provocation. Attach a clip lead to a big INSULATED screwdriver, ground the lead to the frame, and discharge the CRT tube before diving into the circuitry. Remember, you have but one life to give to your profession. >thanks Never thank me before it's working. Bad luck and all that. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| ohger1s@gmail.com: Sep 01 07:48AM -0700 > is it possible to hook up the LCD monitor to test the machine? i made a cable with a female db-15 and individual pins on the other end. > thanks much > mike When my buddy was in the vending business, I repaired several hundred of his monitors, many just like this one. I seem to recall a horiz phase adjustment on the main board. Sometimes just tweaking this pot would lock in the picture. If the board has never been recapped, it's time to do this. Go to Digikey and select low ESR high hour caps (I prefer Panasonic) and shotgun the board. |
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