Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: Owl on August 30, 2010, 08:14:59 am
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Greetings guys,
I have an Hantarex Polo 25" monitor that i had to replace the flyback and all electrolitic caps. After that the monitor didnīt powered up and was making the tic-tic sound... Had the correct voltage at TP6 (+138V) and still nothing. Anyway i found the problem and corrected it but a new problem showed up:
the monitor displays the image but.. a veeeeeeeery WIDE one and had no H. Amp. control. Once again found the problem and finnaly the monitor work perfectly... well... quite perfectly as the damn monitor ONLY WORKS FINE OUTSIDE!! the cabinet.
OUTSIDE the cabinet the monitor gives a perfect image. Once installed in the cabinet, it gets light green at the lower corners and light blue on the top ones.
Anyone has an idea why the hell is this happening? I worked with monitors before and never saw anything so stupid as this. :S
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Are there any unshielded speakers or anything else magnetic that may be causing the problem?
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nop.. nothing at all. :S
i can see the monitor getting green as it gets inside the cabinet. Its a Rene Pierre cabinet. The monitor was always there and never had this stupid problem before :angry:
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nop.. nothing at all. :S
That can't be entirely true. *Something* has to be interfering with the normal operation of the monitor, since, as you say, "i can see the monitor getting green as it gets inside the cabinet." That tells me that something inside the cabinet, or possibly even the cabinet itself, is causing some type of magnetic/electrical interference with the normal operation of the monitor. Can you post pics of the cabinet interior, where the monitor goes in? And possibly a pic of all the internals?
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The cabinet is simply wood made.
i will post a few pictures for you guys to have an idea...
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I'm wondering, since you mention it's occurring at the corners, if there might be some steel angle-brackets holding the wood surrounding the monitor? If so, it's a possibility they're holding some residual magnetism... Of course, I'm talking through my hat, here. I'll await the pics.
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Hereīs a few pictures of this "piece-of-work" :angry:
The Cabinet:
http://www.icebird.biz/Hantarex/Cabinet/1.JPG (http://www.icebird.biz/Hantarex/Cabinet/1.JPG)
http://www.icebird.biz/Hantarex/Cabinet/2.JPG (http://www.icebird.biz/Hantarex/Cabinet/2.JPG)
http://www.icebird.biz/Hantarex/Cabinet/3.JPG (http://www.icebird.biz/Hantarex/Cabinet/3.JPG)
With the monitor inside the cabinet:
notice the green in the left and right lower corners
http://www.icebird.biz/Hantarex/Inside/1.JPG (http://www.icebird.biz/Hantarex/Inside/1.JPG)
http://www.icebird.biz/Hantarex/Inside/2.JPG (http://www.icebird.biz/Hantarex/Inside/2.JPG)
http://www.icebird.biz/Hantarex/Inside/3.JPG (http://www.icebird.biz/Hantarex/Inside/3.JPG)
http://www.icebird.biz/Hantarex/Inside/4.JPG (http://www.icebird.biz/Hantarex/Inside/4.JPG)
With the monitor outisde the cabinet:
a plain clean image
http://www.icebird.biz/Hantarex/Outside/1.JPG (http://www.icebird.biz/Hantarex/Outside/1.JPG)
http://www.icebird.biz/Hantarex/Outside/2.JPG (http://www.icebird.biz/Hantarex/Outside/2.JPG)
http://www.icebird.biz/Hantarex/Outside/3.JPG (http://www.icebird.biz/Hantarex/Outside/3.JPG)
http://www.icebird.biz/Hantarex/Outside/4.JPG (http://www.icebird.biz/Hantarex/Outside/4.JPG)
i moved the monitor to diferent places including leaving it in the middle of the living-room with absolutly nothing around the cabinet but the problem remains :s
impressive, uh? :S
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Can you take a picture *into* the case, with the monitor leaning outward like it is? (So, take one of the last pictures, and point your camera down and in, from above.)
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ok, here goes a few more pics then...
Cabinet (part 2):
http://www.icebird.biz/Hantarex/Cabinet2/1.JPG (http://www.icebird.biz/Hantarex/Cabinet2/1.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/2.JPG (http://www.icebird.biz/Hantarex/Cabinet2/2.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/3.JPG (http://www.icebird.biz/Hantarex/Cabinet2/3.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/4.JPG (http://www.icebird.biz/Hantarex/Cabinet2/4.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/5.JPG (http://www.icebird.biz/Hantarex/Cabinet2/5.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/6.JPG (http://www.icebird.biz/Hantarex/Cabinet2/6.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/7.JPG (http://www.icebird.biz/Hantarex/Cabinet2/7.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/8.JPG (http://www.icebird.biz/Hantarex/Cabinet2/8.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/9.JPG (http://www.icebird.biz/Hantarex/Cabinet2/9.JPG)
http://www.icebird.biz/Hantarex/Cabinet2/10.JPG (http://www.icebird.biz/Hantarex/Cabinet2/10.JPG)
Monitor entering the cabinet:
(from outside to completly inside the Cabinet)
http://www.icebird.biz/Hantarex/Entering/1.JPG (http://www.icebird.biz/Hantarex/Entering/1.JPG)
http://www.icebird.biz/Hantarex/Entering/2.JPG (http://www.icebird.biz/Hantarex/Entering/2.JPG)
http://www.icebird.biz/Hantarex/Entering/3.JPG (http://www.icebird.biz/Hantarex/Entering/3.JPG)
http://www.icebird.biz/Hantarex/Entering/4.JPG (http://www.icebird.biz/Hantarex/Entering/4.JPG)
http://www.icebird.biz/Hantarex/Entering/5.JPG (http://www.icebird.biz/Hantarex/Entering/5.JPG)
http://www.icebird.biz/Hantarex/Entering/6.JPG (http://www.icebird.biz/Hantarex/Entering/6.JPG)
http://www.icebird.biz/Hantarex/Entering/7.JPG (http://www.icebird.biz/Hantarex/Entering/7.JPG)
http://www.icebird.biz/Hantarex/Entering/8.JPG (http://www.icebird.biz/Hantarex/Entering/8.JPG)
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Dumb question, but have you tried de-gaussing the monitor after installing it back in the cab?
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Ok. I have a request that you might find really strange. (After degaussing, of course, and seeing if that works.) Can you move the cab to another spot in your room? I'm wondering if maybe there's an electrical wire somewhere in your wall that might be running vertically through some of your studs, and possibly might be causing the problem. I know I used to have an old CRT that had some problems like this, and they disappeared when I moved my desk.
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The POLOīs auto degauss at startup (at least the european model)
I already tried to move the cabinet to somewhere else... the problem remains
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perhaps the PTC component is faulty
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MANUALLY degauss inside the cabinet .
run coil over EVERY piece of steel/nut/bolt/screw near the crt.
something has a stray magnetic field .
i have seen this symptom in tv servicing. had a couple that metal framing was magnetized
by an all too near lightning strike.
in each instance , it took a few tries to neutralize the field.
be persistent !
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If the PTC is bad, is it suposed to have a clean image if the monitor is outside the cabinet? :s
and... how can i degauss it manually?
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If the PTC is bad, is it suposed to have a clean image if the monitor is outside the cabinet? :s
and... how can i degauss it manually?
yeah don't always work like that i am afraid
if your degauss circuit is working and you still have a gaussed screen then the only explanation is a very powerful magnetic field close by
manual degauss by way of a manual degauss wand(you see them on ebay)
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I just used a really powerful speaker magnet that I had lying around to just pull the colors away. It was a pain, took about 10 mins but I got it. It was free too! ;D
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Well... iīm up to anything at the moment, so i will start with the speaker...
i really have no idea of whats causing the problem... :S
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to deguass , an alternating magnetic field is required .
a degaussing coil produces an alternating electromagnetic field at 50/60 hz (pending country)
i 'spose using a speaker one might be able to induce enough of an opposing field to nuetralize.
though i'd think a bit difficult to accomplish with a fixed field...
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i used a pretty strong magnet and it indeed fixed the colors but it doesnīt give a neat look to the arcade since the speaker magnet is outside the cabinet, so i will have to find out another way to fix it. I already tried to push the colors with the magnet to the proper places but they return to the wrong places after a while if the magnet is not present :s
another thing is... i donīt have 138v at TP6 nomore. its alot higher than that in fact (around 180v), but the monitor works fine :s
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check the regulator circuit* . am surprised the HV shutdown is inactive . that should be checked as well .
*assuming you're using the correct ground point
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as i stated before... iīm up to anything atm...
what ground point are you refering to?