CurtPalme.com Home Theater Forum

ryozo · Joined: 09 Jul 2009 Posts: 8

Hi,

I just discovered that my g90 began exhibiting some weird behaviors when accessing the menu. It would at sometime be shaky and sometime would be perfectly still. However, when I'm playing a movie it look perfect. But the shaky menu gets a little annoying when you're trying to access something. Is this something I can adjust in the menu? Or is it a physical problem?

Thanks a bunch

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

This is very interesting. Not to shout fire but I'm wondering if this is how the onset of ic421 failure reacts.

How many hours are on the machine? What is the projectors serial number? I wont ask for ic numbers just yet.

Oh, and to answer your question....no, there is no adjustment for this. Unless it happens to be a geometry or convergence issue but I doubt it. But you never know.

ryozo · Joined: 09 Jul 2009 Posts: 8

Yeah I read on another site that it can possibly be an ic failure. I do not have the serial number, but the hours are 1546 and it was manufactured in august 99.

But wouldn't an ic failure affect the projection as a whole, meaning both video source and menu?

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

**Curt Palme** · Posted: Sat Apr 24, 2010 6:08 pm Post subject:

Mac, while I agree with your diagnosis, I don't buy that menus drive a chip harder than regular content.

I think this is a simple mismanufacture of that chip, and it only came to light a few years after they were cranked out.

Ryozo, I'd just ignore it for now, but if you lose control of all (projector) functions save for power on/off, and the whole image shakes, you'll need a new Ya board which at this point are almost impossible to find.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

HaydnG90 · Joined: 22 May 2006 Posts: 1356

As Mac has said, I hope for your sake that its not a IC421 that's on the brink of failure. One way to help diagnose this is if brightness and contrast adjustments register when the menu is brought up and causing the instability. When my chip failed the image was unstable and none of these controls were operational. btw my chip also failed at 1500 hrs. Good luck.

CIR Engineering · Posted: Mon Apr 26, 2010 2:19 pm Post subject:

I can probably get a replacement YA board if Curt doesn't have one. Let me know if you need it.

craigr

ryozo · Joined: 09 Jul 2009 Posts: 8

Thank You all for your input. Just in the event I do need to buy one, how much would they be? I saw one that was for sale in decemember from dochlywd. Would the price be roughly the same?

CIR Engineering · Posted: Tue Apr 27, 2010 1:08 pm Post subject:

HaydnG90 · Joined: 22 May 2006 Posts: 1356

CIR Engineering · Posted: Wed Apr 28, 2010 5:54 pm Post subject:

HaydnG90 · Joined: 22 May 2006 Posts: 1356

My bad it was $1800

http://www.avsforum.com/avs-vb/showthread.php?t=826882&highlight=ya+board+sony+repair

This was the new board price per the Sony broadcast parts site. When I was looking at different options to binning the pj, there was mention that a source in Japan had brand new boards about 18 months ago. This source apparently wanted $2200. In the end I found a parts G90 locally, scavenged the the YA and sold the extra's I didn't need such as HD10F lenses, input boards, 2 remotes and a ceiling mount. All told I'm out $800 but have a complete set of working boards and magnetics...just in case.