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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 9:33 am Post subject: Nec 6pg H width fault |
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It's been 6 months since I powered up my 6pg. 
Well last night I fired her up running 1280x720 from my HTPC and everything is fine except the H width / amplitude is not working? The image is collapsed horizontally.
H amplitude still works on R and B though.
The V amplitude still works. Projector Status is 00. Ran her for 2 hrs with no change.
I've even tried adjusting the H width on the deflection board, still no change.
H fail LED is off.
Now, I've discovered that the H width on the deflection board works when on video input, and the H amplitude also works on video input. 
Any ideas? 
Many Thanks
Brian
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 2:09 pm Post subject: |
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Maybe first try reseating the boards in the card cage.
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 2:23 pm Post subject: |
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Thanks.
I thought about reseating the boards last night, but I've had this projector on the ceiling for the last 6 years, untouched, and its been rock solid from the first setup I did. This is the first fault EVER.........
I'll give it a try anyway.
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 3:06 pm Post subject: |
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Reseated the cards as suggested, no change. 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 3:16 pm Post subject: |
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Ok. Next I would try sending various resolution from your PC to see what happens. Start with 480 then 600, 720, 960 and 1024. Try adjusting width through menu. Dont turn width pot on deflection board when on.
2 things we're looking for. Does the adjustment work on any other resolutions and does the pic get smaller as you increase resolution.
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 3:28 pm Post subject: |
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Last night I tried lowering the resolutions as you suggest.
There is no H amplitude adjustment at any PC resolution, 1280 and lower. -100% to +100% has no effect.
The image does gets wider as the horiz resolution drops, ie 1280, 1024, 800 etc.
Also, the H width pot has no effect on any PC input, only the video input as mentioned in my original post.
Any ideas?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 3:41 pm Post subject: |
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Does it keep vert height during resolution change or does this also get smaller with higher resolution?
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 3:59 pm Post subject: |
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The vert height reduces as resolution increases.
The vert amplitude adjustment is working as it should.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 4:04 pm Post subject: |
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| briancurran wrote: | The vert height reduces as resolution increases.
The vert amplitude adjustment is working as it should. |
Can you correct the vert height to fill the screens top and bottom at higher resolutions even if the horz wont fill the sides?
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 4:09 pm Post subject: |
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Yes.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 4:21 pm Post subject: |
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I'm really thinking its a deflection board problem. But it working on the video input concerns me with this. Of course this is 480i and requires simple circuitry changes for sync. Now if the vert was an issue then I would think deflection more so because it could be a deflection switching problem. But I'm still thinking this. Now if it was a system board problem then the horz pot should still work. But it doesnt. So I'm back to deflection board again.
Your either going to have to send Curt some boards to test or get some boards to try.
Is this a regular PG? Or a plus /extra?
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 4:31 pm Post subject: |
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Its a regular PG.
There's one thing, I've been running the H amplitude at +100%, could this have caused this?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 4:41 pm Post subject: |
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I cant say it definitely wouldn't but I doubt it. If anything a strain there would blow the horz output transistor. I've run PG+ with no problems as such.
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 7:18 pm Post subject: |
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What boards should I be looking at / for?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Sep 04, 2009 7:35 pm Post subject: |
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Bad system or wave board, or bad deflection board. These plain PGs are now getting to be 15+ years old, and part failures due to age are common. Good thing is, I've nailed most of the problems down, so if you want, send all three to me and I can test/repair them.
Figure $150-250 depending if you want me to replace all common parts, or just repair what's gone bad.
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Fri Sep 04, 2009 7:58 pm Post subject: |
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Thanks Curt.
I'm in UK, does that figure include return shipping? 
I've been considering going digital recently, probably a bad idea I know, but after 14yrs of listening to CRT's cooling fans, I'm tempted and this might be a sign ........ LOL
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri Sep 04, 2009 10:46 pm Post subject: |
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| Curt Palme wrote: | Bad system or wave board, or bad deflection board. These plain PGs are now getting to be 15+ years old, and part failures due to age are common. Good thing is, I've nailed most of the problems down, so if you want, send all three to me and I can test/repair them.
Figure $150-250 depending if you want me to replace all common parts, or just repair what's gone bad. |
More like 17 years old...
They do need a little loving these days.
Curt, make sure you replace the big 47uf (10uf on PG I think) deflection board cap for a 470uf cap, to stop the buzzing. NEC stuffed up there. NEC Australia was changing this cap as a matter of course, whenever a PG came in for service, for any reason.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Sep 04, 2009 11:59 pm Post subject: |
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| briancurran wrote: | Thanks Curt.
I'm in UK, does that figure include return shipping?
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Most likely, yes. SHipping will be about $60 of that total. Keep the NEC going for a while yet if the tubes are in good shape. Can't buy a digital that will last for 2-5 more years for $250.
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briancurran
Joined: 04 Sep 2009
Posts: 10
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| Posted: Sat Sep 05, 2009 8:04 am Post subject: |
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Mark is correct, yes manufactured 1992.
I actually got the 470uf cap a few years ago to do that mod but never got round to fitting it. LOL
Curt
She has only done 3100 hrs, so I guess there's a few years left.
I'll let you know if I decide to ship the boards over to you.
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