I need direction regarding my Sharp Image KTM-F2 monitor issues

barfdogg

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I need direction regarding my Sharp Image KTM-F2 monitor issues

I have a showcase Tekken 4 unit with an unhappy monitor. I believe it to be a 34" Sharp Image KTM-F2 based on the markings I have found. The symptoms are as follows: The screen is a bit dim, has a slight wobble, has very touchy sync, and most importantly, there is no green at all, and adjusting the pots have no affect. Also, the bottom right corner has distorted colors as if it needs to be degaussed. From what I have read in these forums, it sounds like a need to replace the capacitors, however, I cant seem to find a "cap kit" and am not fully convinced that, in itself would resolve my issues anyhow. I have never ventured into monitor repair, as it has always made me a bit uneasy, however, I can no longer avoid doing so, and need some sort of direction. Any input would be appreciated!
 

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yes a cap kit with filter cap should solve the wobbel.

you may have to make your own kit if one is not readly avaible.

its not hard look at all the caps and see what their uf and voltage rating is.

As you go thru rite each value down on a piece of paper. then mark each cap on the top with a sharpie after you get the uf and voltage value.

then you can buy them from digikey or mouser.

also its ok to install a cap with a higher voltage rating. but make shure the uf is the same.

hope this helps its what i do to all my monitors and they all look great.

Peace
Buffett
 
yes a cap kit with filter cap should solve the wobbel.

you may have to make your own kit if one is not readly avaible.

its not hard look at all the caps and see what their uf and voltage rating is.

As you go thru rite each value down on a piece of paper. then mark each cap on the top with a sharpie after you get the uf and voltage value.

then you can buy them from digikey or mouser.

also its ok to install a cap with a higher voltage rating. but make shure the uf is the same.

hope this helps its what i do to all my monitors and they all look great.

Peace
Buffett

Thanks man, Ill get to it.
 
You might trace down the green issue first.
Thats not a cap problem.

In the picture you see the input header,rbg wires
using the black wire as a ground.
Measure the voltage on the header maybe low voltage, i use a fixed
pattern so to keep them near the same dc level,and with a o-scope its easy
to tell if you have all your RBG signals..to the chassis.
Visual inspection of headers for hairline cracks around the pins
is important.
It takes off from there to the RGB buffer board the daugther board in the picture.
then to the video processor ic, the one behind the daughther board
should be Lmxxxx ic look up the datasheet and find the pinouts for rgb out
compare the dc or waveform..
Out of the chip it goes to the plug near it you can see the plug in the picture
it too has the rgb wires leading to the neck board.
Should have a some dc on each rgb pin of plug,
The problem should be on the neck board form my experience,but it never hurts
to follow the rgb path and confirm you know, you have what you need for the
rgb video amps the transistors.
And old trick is to swap the trans with another trans from a good known
circuit or replace new transistor then see if you have your green back.
The 3watt resistors on neck bd,supplys the cathode voltages and to each transistor
so ofcoarse you need collector voltage on all three transistors.
I measure the cathode for rgb and compare the dv,when the transistor has high
collector that means the trans is not working or you have a open cathode.
Another option is test the CRT for low green emission or missing, to eliminate the crt.
This is all part of troubleshooting not a quick fix,its up the tech to decide
what is failing.
Good connections around the trans and 3 watt resistors is very inportant
on the neck board.
Ofcoarse you can do a capkit first but it won't complete the repair,you will
have to know whats wrong the green issue sooner or later!
If the tube is good,then repair the green problem,then cap kit.
Good Luck!
 
Hmm, very helpful info. I figured the green would be more than a simple fix. Ill have to talk this over with a friend tonight and see if between the two of us, we can make sense of the situation. Thanks

You might trace down the green issue first.
Thats not a cap problem.

In the picture you see the input header,rbg wires
using the black wire as a ground.
Measure the voltage on the header maybe low voltage, i use a fixed
pattern so to keep them near the same dc level,and with a o-scope its easy
to tell if you have all your RBG signals..to the chassis.
Visual inspection of headers for hairline cracks around the pins
is important.
It takes off from there to the RGB buffer board the daugther board in the picture.
then to the video processor ic, the one behind the daughther board
should be Lmxxxx ic look up the datasheet and find the pinouts for rgb out
compare the dc or waveform..
Out of the chip it goes to the plug near it you can see the plug in the picture
it too has the rgb wires leading to the neck board.
Should have a some dc on each rgb pin of plug,
The problem should be on the neck board form my experience,but it never hurts
to follow the rgb path and confirm you know, you have what you need for the
rgb video amps the transistors.
And old trick is to swap the trans with another trans from a good known
circuit or replace new transistor then see if you have your green back.
The 3watt resistors on neck bd,supplys the cathode voltages and to each transistor
so ofcoarse you need collector voltage on all three transistors.
I measure the cathode for rgb and compare the dv,when the transistor has high
collector that means the trans is not working or you have a open cathode.
Another option is test the CRT for low green emission or missing, to eliminate the crt.
This is all part of troubleshooting not a quick fix,its up the tech to decide
what is failing.
Good connections around the trans and 3 watt resistors is very inportant
on the neck board.
Ofcoarse you can do a capkit first but it won't complete the repair,you will
have to know whats wrong the green issue sooner or later!
If the tube is good,then repair the green problem,then cap kit.
Good Luck!
 
How do you figure? I thought I noticed a couple small wisps of smoke the last time i turned it on, but I wasn't sure if it was in my head or not.

A short in one of the color guns isn't going to cause catastrophic failure symptoms, it will cause one color to be more dominant than the rest and give the overall image a tint of whichever gun is shorted. For example a shorted green gun will give the image a green tint, a short in your red will give a you a red tint and so on. You can always try to adjut the gain controls for the different colors but if you have a short, not matter how much you adjust it, you won't be able to get rid of the tint.
 
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