CurtPalme.com Home Theater Forum

poen · Joined: 21 Dec 2012 Posts: 51

Hi there:)

I own a Sony 1271, and while I'm quite new with these devices I managed after researching many aspect to get quite a good picture on my wall.

Not long ago I had to replace my blue tube, after doing this the projector is rather shaky when I turn it on. It happens with all tubes and the shakiness is going from left to right (Not up and down!)

It also happens in the test screen, however not that much, it increases a lot when I go back to normal. Sometimes switching the projector on/off solves the issue for a couple of minutes, but it always shows up after a while which is off course very annoying.

What could be the possible issue I am facing here?

Help is much appreciated!!

**AnalogRocks** · Posted: Tue Feb 26, 2013 7:27 pm Post subject: Re: Shaky image - Sony 1271

poen · Joined: 21 Dec 2012 Posts: 51

Thanks for your reply AnalogRocks,

Yes, when replacing the Blue Tube I disconnected the old blue tube wire and inserted the wire of the new lamp in the high voltage block.

And no, I cannot recall that I ever noticed a PLOP sound, the only thing I can hear when turning the thing on is a very tiny fan on the back of the top board making a little noise

**Curt Palme** · Posted: Tue Feb 26, 2013 8:11 pm Post subject:

It sounds indeed like one of the red HV leads is not properly secured in the splitter. If the problem gets worse as the contrast gets turned higher, than check the HV splitter for loose leads. They need to be properly seated and turned in the splitter. A gentle tug on the HV lead should not remove it from the splitter.

**AnalogRocks** · Posted: Tue Feb 26, 2013 8:58 pm Post subject:

When you check that HV wire from the blue tube. See if it has any signs of arcing. Maybe burn marks on the end of the wire.

poen · Joined: 21 Dec 2012 Posts: 51

Thank you again, also Curt.

Will try this out tomorrow! and let you know about it.

poen · Joined: 21 Dec 2012 Posts: 51

It indeed appeared that the blue cable was not attached correctly, however by fixing that (no burn marks by the way) the problem is still there... could it be some connection that is loosen or something broken?

**Curt Palme** · Posted: Sun Mar 03, 2013 4:08 pm Post subject:

HV arcing is sneaky, short of burning a pinpoint hole into the HV wire (or your finger, been there, done that), HV isn't like 60hz 120 volt AC line, where there's a big smoke show. HV at high frequencies and very low current never leaves a mark... but you sure can feel it!

Disconnect each tube's HV lead one at a time. I'm still thinking when you take one lead out that's arcing, the other two tubes will be fine.Maybe when you took the blue lead out, you knocked one of the others out of place?

poen · Joined: 21 Dec 2012 Posts: 51

Ok, so if I understand you correctly Curt, the projector will still work if one of the tubes is disconnected from the HV lead? if so, I will try that this evening, to see if indeed one of the tubes individually is causing the problem.

I don't think I knocked one of the others out of place, in fact I am really sure. I might have damaged the blue one a little since it was hard to pull out and required some force at some point (spinning force) however it still slips in perfectly and works as intended.

**Curt Palme** · Posted: Sun Mar 03, 2013 4:57 pm Post subject:

Yes, it will work with 1 or 2 tubes disconnected. Post when you find out the results.

poen · Joined: 21 Dec 2012 Posts: 51

Without blue connected, the problem is still there. I tried to disconnect green as well, however that one seems to be really stuck. Is it easy to take the big red box out (HV box?) right now I do not have that much space to work with.

I guess by trying to get green out I made it even worse, the screen is really flickering right now (warm up screen that is)

I do not want to make this problem worse as it is, but it seems that is what is happening... suggestions?

Thanks!

poen · Joined: 21 Dec 2012 Posts: 51

Connected all as how it was, everything is back to normal again, that means off course the shaky image.

Could it also be that something is damaged? some time ago it appeared that my blue tube was cracked, the glass broke due to transporting the whole thing, it was the reason I changed it. However it worked for some time (not realizing the glass was actually broken) until after 10 hours or so the projector did not fire up anymore and gave an error message, tried to turn it on for about 6 times, got some sparks flying out at various points.

These 6 times, could they have destroyed something that is causing my problem?

poen · Joined: 21 Dec 2012 Posts: 51

another weird aspect: right now I am in the test screen, the image is completely stable. However when changing back to 'normal' it begins to shake again. both up/down of contrast / brightness have no effect on the shakiness whatsoever.

poen · Joined: 21 Dec 2012 Posts: 51

http://www.avsforum.com/t/654321/help-sony-1271-vertical-picture-problem

This man is describing the same problem as I have, 'started twiddling with wires on the vertical sync board whilst the PJ was switched on.' that is how he fixed it, I am wondering now, what exactly is the vertical sync board?

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

You sure this isnt deflection shake?

poen · Joined: 21 Dec 2012 Posts: 51

Thanks for your reply Case, what exactly is deflection shake?

**Curt Palme** · Posted: Fri Mar 08, 2013 2:06 pm Post subject:

poen · Joined: 21 Dec 2012 Posts: 51

Hello Curt,

I've cleaned most of the connectors on all the boards, pushed the chips where I could and cleaned + re-inserted all the cables in the HV box also the little fan in the back was a little noisy and replaced this one with a new one (oil did fully fix it). So far the projector is quite stable, it still shakes a little, mostly up/down, but only a centimeter or so, you don't see this from a 2/3m distance anymore.

I have a 1251 projector, I used the blue lamp from this 'old' one to replace my cracked one.

I am quite satisfied with what I have right now, its much better as it was (hopefully it will stay like this!!) however the only resolution which seems to work for me is 1024x780 - 75hz, if I go higher / lower I will see a lot of these lines: http://www.youtube.com/watch?v=3SyAtSRtJj4 - watch in 720p, around 15 seconds you can clearly see it (scanlines?)

I could replace a few boards from my old 1251 to the 1271, which of the 3 would you suggest to try first?

Thanks again for all the provided help, really appreciate it!

**Curt Palme** · Posted: Fri Mar 08, 2013 3:37 pm Post subject:

From what you're describing, I can't narrow it down at all, sorry! Just swap them one at a time, and if they don't solve it, then swap them back to keep the set as original as possible.

poen · Joined: 21 Dec 2012 Posts: 51

It appears that when switching the second board, the imagine becomes more stable. Here is a picture i Quickly took to compare some of its settings. I have no clue what board this is, also I dont know exactly what those little screws can do, as you can see not all of them are the same.

Is there some explanation of these settings available, or should you never touch those at all?

Can't add the picture, so uploaded it here: https://www.dropbox.com/s/4ji42ktbw152pjw/IMG_20130308_181715.jpg