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Post by Casethecorvetteman on Jun 23, 2018 20:07:38 GMT -5
Hi all  Been a while since ive had any time to do anything much, but ive finally made it back! I have an issue with my RUNCO DTV991, which is an XG 852. It works perfectly when it is first turned on, but after it warms up, the screen size changes and shrinks, and the convergence goes out of alignment, the corners all pull inwards. Im not sure what board is faulty, or what would be causing this. What XG boards are compatible with 852s? would be easier if I can swap out boards to locate the faulty board, but Al has no 852s, his XGs are all different models. I know some boards are the same or simular through all models, but I know some are totally different. Thanks all |
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Post by mastertech on Jun 23, 2018 20:20:16 GMT -5
Hi stranger. Good to see you back. Does it go out of focus also? if not then it might be the convergence board. Try disconnecting it and see if the image still changes on warm up..
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Post by Casethecorvetteman on Jun 23, 2018 21:50:47 GMT -5
Hi stranger. Good to see you back. Does it go out of focus also? if not then it might be the convergence board. Try disconnecting it and see if the image still changes on warm up.. Gday I have not seen the focus move at all, ive just been pulling some boards out of the back, they all still look like theyre brand new!! The problem actually happened straight away when I turned the set on after pulling the boards out of the rear and putting them back in, so im not sure if one of those boards could have a bad connection and this may cause an issue? Focus stays sharp, so it is just the H amplitude shrinking and the convergence is obviously affected at the same time, as is the pin and bow ( pin and bow change when you ramp the amplitude up and down normally anyway ) Doesn't seem to be shrinking vertically, only horizontally. |
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Post by Casethecorvetteman on Jun 23, 2018 22:19:21 GMT -5
Ok, so a bit more to add,
Disconnecting the convergence board did not change anything, it ran for about 30 seconds and said something about abnormal correction data before shutting off. The image still moved a bit.
I tried adjusting the H AMPLITUDE in the menu, which does very little until you get to about -65, then it starts to shrink. It is set around +70 for 1080i on my set, and as you ramp it back up nothing changes after about -65ish.
Would this be an issue on the H-DEF board?
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Post by Casethecorvetteman on Jun 23, 2018 22:26:10 GMT -5
If I adjust the red or blue AMPLITUDE, they adjust as they should. Adjusting main AMPLITUDE will not work as per normal, but vertical does work fine.
The key and pin and bow all work as per the way they should, its just the horizontal AMPLITUDE that controls all 3 that isn't working right, and it still moves on its own.
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Post by Casethecorvetteman on Jun 23, 2018 22:45:35 GMT -5
Also, adjusting the H-WIDTH pot on the H-DEF board seems to do almost nothing.
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Post by Casethecorvetteman on Jun 24, 2018 0:15:27 GMT -5
Well if it is H-DEF, we will know in the next couple hours, im rollin up to Al's joint to grab a spare.
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Post by Casethecorvetteman on Jun 24, 2018 3:29:02 GMT -5
Ok, so I got a spare H-DEF from Al, and it is rooted, throws up a B1 error. swap the old one back in and no more error, just the shrinking H-Deflection.
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Post by gjaky on Jun 24, 2018 4:43:37 GMT -5
I've had a similar issue, that was shrinking on the left side only, after 1 hour or so. It was caused by the relays on the H-DEF.
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Post by Casethecorvetteman on Jun 24, 2018 6:34:36 GMT -5
Problem fixed, it was the H-DEF board, got two more and both worked.
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Post by Casethecorvetteman on Jun 24, 2018 6:36:05 GMT -5
I've had a similar issue, that was shrinking on the left side only, after 1 hour or so. It was caused by the relays on the H-DEF. Mine was shrinking on both sides evenly, and adjusting AMPLITUDE did nothing. You reckon the relays will be the issue? |
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Post by gjaky on Jun 25, 2018 1:28:21 GMT -5
I've had a similar issue, that was shrinking on the left side only, after 1 hour or so. It was caused by the relays on the H-DEF. Mine was shrinking on both sides evenly, and adjusting AMPLITUDE did nothing. You reckon the relays will be the issue? Probably no. If Amplitude is not responsive, then there is a problem with the electronic circuits. There is a rather sophisticated network that governs the range of amplitude, since different voltages are needed to keep the same picture width at different scanrates. So the problem is most probably lies there |
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Post by Casethecorvetteman on Jun 26, 2018 21:50:10 GMT -5
Yeah mate thought so, seemed too good to be true really! |
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