CurtPalme.com Home Theater Forum

[enricho21]

Howdy Y’all. I’ve got an NEC 9PG with 4000 hours on it which I’ve had for a couple of years. Since I’ve had it, the projector has had an issue syncing horizontally which would get better as it warmed up. At the start of the issue it would take 15 minutes to ‘lock on’ to the picture and I could see it warming up with the horizontal lines getting wider apart until it locked in, and I could sometimes help it lock by adjusting the horizontal screen position. As the projector would warm up the picture would slowly move to the right so I would need to readjust the position ½ way through a movie. I’ve knocked the resolution of the HTPC that drives it from 1440 x 1080 down to 1280 x 960 and it seemed to lock into the sync easier for a while.

The issue has been getting progressively worse, so it’s been taking longer and longer to lock onto the signal. I was up to having to ‘warm it up’ for about 45 minutes before I could use it but now it has lost all horizontal hold. It used to be able to always lock onto the low res boot bios screen but can’t even lock onto that now after warming up, the horizontal hold/screen position has finally given up.

Now that you know the background on the projector I have two options, either buy another board if I can determine which one controls the horizontal hold/position, I’ve noticed a few 9PG boards on ebay but the freight to Australia costs more than the board. The other option is to get the board fixed.

I’ve first thought it might be the electrolytic capacitors drying out and had thought about getting a TV tech to replace all the capacitors on that board.

I guess my questions are firstly, which board controls the horizontal position of the picture and secondly what are the recommendations from others, has any one else seen this issue. Thanks in advance for your advice and replies.

[Mark_A_W]

It needs a new deflection board, or maybe recapping that board, or part of it. The service manual is around, to figure out which part of the def board is the oscillation section.

But it will be cheaper and easier to get another board.

[macgyver655]

Sounds like a system board. How is it with 720@60? 768 if 720 is not available.

Let me add that Marks statement could also be correct but I have had these same conditions with several system boards.

[Curt Palme]

My guess is both. If you want, send them both up, and I'll test/repair as required. At about 16 years old, there are a bunch of parts I change in both boards at this point.

[Curt Palme]

My guess is both. If you want, send them both up, and I'll test/repair as required. At about 16 years old, there are a bunch of parts I change in both boards at this point.