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G90 top portion of screen flashes 2

 
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kenwrob



Joined: 21 Jul 2008
Posts: 21



PostLink    Posted: Thu Feb 20, 2020 11:12 pm    Post subject: G90 top portion of screen flashes 2 Reply with quote


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I posted in this similar named thread :

http://www.curtpalme.com/forum/viewtopic.php?t=42139&start=20&postdays=0&postorder=asc&highlight=&sid=45a00e2cf03d33571c64647be7e173a7

But I don't think it got noticed or responded to, so I will start a new thread and see if
any one knows what is causing this, and what the fix might involve.

Wow, I just saw this post and my G90 has been doing the same thing for a couple years now. It only does this
from a cold start and starts about a minute into warm-up, and lasts for about two minutes at which point it goes away. It is a distortion at the top third of the screen, and I have assumed it is a bad transistor somewhere and could locate it possibly using a cold spray can. But I have no idea where to look; a lot going on in the G90.
By the way the projector is ceiling mounted in my basement theater. Other than that start up glitch, it has been flawless.
Like others have mentioned, I start the PJ about fifteen minutes
before the show starts to let it warm up. The problem won't recur until the PJ is cold.
I have uploaded a video of the pj start up from cold start.
Four short iPhone videos have been combined into one and the
resolution has been downgraded, but the effect is still seen.
The color shifting is a result of the recording device as is
not seen with the eye.
Is this the issue others have seen? and if so has it been
diagnosed to a particular replaceable board.

*I have uploaded a second video with better resolution.

https://www.youtube.com/watch?v=Hq42caGZFYY&feature=youtu.be

https://www.youtube.com/watch?v=0cIP9G_oSH0&feature=youtu.be

https://youtu.be/0cIP9G_oSH0[/url]
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HaydnG90



Joined: 22 May 2006
Posts: 1167



PostLink    Posted: Fri Feb 21, 2020 12:26 am    Post subject: Reply with quote

Have you checked the CLAMP settings in the service menu? Must not be AUTO
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kenwrob



Joined: 21 Jul 2008
Posts: 21



PostLink    Posted: Fri Feb 21, 2020 2:35 am    Post subject: Reply with quote

Yes, I just checked and it was in H/C position. I changed it to Auto and it didn't make
any difference. It seems to be a thermal related issue as it only occurs when the pj is
turned on from a cold start. If I turn it off for several hours and turn it back on, it
won't do it again. It only occurs from a cold start and clears up after a few minutes
of operation. Also, I am using a Moome card for input and both HDMI ports, one from
a Blu-ray and one from a Windows pc.
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23813
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat Feb 22, 2020 5:00 pm    Post subject: Reply with quote

It's possible it's a bad vertical board. I should have a spare here, as would Craig Rounds.
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kenwrob



Joined: 21 Jul 2008
Posts: 21



PostLink    Posted: Sat Feb 22, 2020 11:04 pm    Post subject: Reply with quote

Hi Curt, is the vertical board the same as the deflection board that Craig refers to in the other thread ?

http://www.curtpalme.com/forum/viewtopic.php?t=42139&start=0&postdays=0&postorder=asc&highlight=

If not, which board is it likely to be? Were you able to tell anything from the videos I posted?
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23813
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat Feb 22, 2020 11:16 pm    Post subject: Reply with quote

Yup, looks like what Craig diagnosed already/
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kenwrob



Joined: 21 Jul 2008
Posts: 21



PostLink    Posted: Sat Feb 22, 2020 11:32 pm    Post subject: Reply with quote

OK, do you have the board I need or do I get it from Craig?
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23813
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sun Feb 23, 2020 4:23 pm    Post subject: Reply with quote

Get it from Craig, it will take me a while to set up a G90.
Thanks!
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CIR Engineering



Joined: 25 Aug 2008
Posts: 3918
Location: Chicago USA & Berlin Germany

TV/Projector: JVC NX9 & Sony G90 Lumagen Radiance Pro 4446


PostLink    Posted: Sun Feb 23, 2020 4:39 pm    Post subject: Reply with quote

It probably is your vertical deflection board and yes I do have fully rebuilt ones on hand.

However, it would be better to repair your existing board if you are able to send it to me. This is because if you keep your board your convergence and geometry will remain good after the repair. If you get a replacement board you will need to partially redo your geometry and convergence for any projector memories. Repair is a bit cheaper than a full replacement board, but both come with a full one year warranty on my work.

Best,
craigr

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Phone: 865-405-6892
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