CurtPalme.com Home Theater Forum

bachiano · Joined: 13 Mar 2006 Posts: 163

Hi Guys

Curt has been trying to help me with this but we haven't been able to figure it out.
Curt already send me a repaired DC convergence board but the problem persists.
He is going to send me another one in a few weeks to try again.

Anyway in the mean time I thought some of you CRT geniuses might be able to help.

480p no problem
720p no problem
1080I no problem

Here is the symptom:
When I run 1080p and try to converge, the PJ shuts down with an error 30.

If I don't try to converge, the PJ will run all day at 1080p without an issue.

Thanks
Bachiano

**Curt Palme** · Posted: Tue May 22, 2012 9:47 pm Post subject:

This has indeed been a VERY frustrating experience for both of us! What SHOULD have been a very straightforward DC board repair has turned into a dark and ugly road. Feel free to correct me if I've missed anything:

Problem originally was an error 30 shutdown. An additional problem was the the red wouldn't focus in the middle (master focus). Had him send up both boards, and all 3 power supplies, as a shorted convergence board can nuke a supply. He sends all boards in. Power supplies are OK. convergence board gives a 30 error code. All common repairs do not cure the shutdown, so board put aside, and another one of my stock are put in. Now, surprisingly, the focus board is causing some shaking on the left side of the image when converging, and has a no focus issue on the red. Spent some time troubleshooting the focus board (which also drives the DC board), nada.

INexplicably, I send the defective focus board, the power supplies and the new convergence board back.

Bach gets an 88 error code. Turns out one of the Ya/Yb boards is slightly out of the socket. Reseats the board. Gets bad red focus. Finds that I've sent the original board back. I send a confirmed working replacement. Puts it in, then all of a sudden the red focusing works on the original board as well. Go figure.

Now he has the problem related above, it works fine.. except at 1080p. Everything I send out always gets an overnight test run at 1080p, and every time I think that I've misdiagnosed or misrepaired something, it almost always ends up being fine, the root problem is elsewhere.

My only guess is that MAYBE a memory got corrupted when the Ya board was not quite connected, sending out crap to the convergence board.. or... there's a partially shorted yoke that sends the convergence board into overload at higher resolutions.

Will try another DC board first, but I'll probably also send down a Ya/Yb board. ANy other guesses?

Short of sending down anotehr convergence board

bachiano · Joined: 13 Mar 2006 Posts: 163

Hi Curt

Yes. That all sounds pretty accurate to me.
Ofcourse frustration for me is that the original symptoms that cause the original error 30
are the same symptoms that I obviously still have and continue causing the error 30.
So after all that back and forth, we are back to square one.

On the other hand I do realize that these problems are sometimes difficult to diagnose.

Hopefully some members here, more imaginative than me,
will be able to help us with some hypotheses.

Thanks
Bachiano

CIR Engineering · Posted: Wed May 23, 2012 4:52 pm Post subject:

You may want to pick up a new blank "Dallas" chip. Install it and initiate the recovery to write default data to a blank chip. Or Curt, maybe you could send a known working Dallas chip just to pop in and test with.

I would suggest possibly sending JohnHW an email to this thread asking for help. He knows more about the inner workings of the G70 on a component level than anyone we have contact with. I am not that good with unusual problems on the G70.

You may also want to send a replacement focus/convergence yoke Curt. I really don't see how that could logically be it, but this is a strange problem.

craigr

bachiano · Joined: 13 Mar 2006 Posts: 163

craigr

Thanks for the suggestions.

Bachiano

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

I hate to bring up the obvious but for the 1080p entry have you neutraled out "ALL" geometry and convergence settings and then centered the image on the tube face and pivot the red and blue over the green? The code 30 is telling you the convergence board is drawing to much current to try to get the adjustments where you want them. Getting everything as manually close as possible before making adjustments is super critical. Even to much of 1 convergence adjustment trying to compensate for another convergence adjustment can cause overload. 1080p just magnifies the strain of these adjustments.

bachiano · Joined: 13 Mar 2006 Posts: 163

**Curt Palme** · Posted: Wed May 23, 2012 10:36 pm Post subject:

I *believe* that the master width is on the H board, in fact I know it is, but maybe it affects the convergence, as the R and B width settings are a function of the convergence board itself, but absolutely, try everything and anything at this point! Smile

bachiano · Joined: 13 Mar 2006 Posts: 163

Ok. I reduced the width by a couple of clicks.
That did not work.
Got an error 30 while trying to perfect lin.

Next I'll try reducing width a lot more.
Perhaps getting it down all the way down to 128.

bachiano · Joined: 13 Mar 2006 Posts: 163

No Luck.
I got width down to 128.
Then I tried to converge.
The second I tried to manipulate convergence I got a shot down and an error 30 :-/

bachiano · Joined: 13 Mar 2006 Posts: 163

Ok - I'd like to point out that there is no problem with size.
I can make the image as big or as small as I want without any shut downs.

What an mystery this is !!!

**Curt Palme** · Posted: Wed May 23, 2012 11:15 pm Post subject:

Did you swap the focus board yet?

Good thing about this thread, I don't think I realized that the set would actually stay on if you go to 1080p, but don't converge. You may have said that in an email, but now it's especially weird, that it will stay on until you start changing parameters. SNAFU'd if I've ever seen one!

bachiano · Joined: 13 Mar 2006 Posts: 163

Interestingly enough.

Curt encouraged me not to do a reset.
Which means that all my convergence settings are still in play.
And I did such a good convergence job originally that I can go watch a 1080p movie
and still be amazed at what this machine is able to do !!!

See you guys later.
Got to go watch a movie Smile

bachiano · Joined: 13 Mar 2006 Posts: 163

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Does it matter if you adjusting the red or the blue when you get the shutdown?

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

The horz size control would more likely kick a code 39.

bachiano · Joined: 13 Mar 2006 Posts: 163

bachiano · Joined: 13 Mar 2006 Posts: 163

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Then your going to have to test the supply voltage to the DC board. +/- 15v and +/- 50v.

Unless that DC board is bad. Have you tried another yet or is it on the way?

bachiano · Joined: 13 Mar 2006 Posts: 163

I'm now using a DC board Curt repaired and tested.

I still suspect that it's still a DC board problem as it is called a Convergence DC board.

However, not to convolute things, the symptoms were there with my original DC board and there still there with the one he send me.

Curt said "I'll send down all the boards from it that could possibly cause the error 30", on a set he has.

In the mean time can you give me a tutorial on how to test the supply voltage to the DC board?

I have a fluke 79 III.
Will that do?

Sorry. I know that is asking a lot.

Thanks
Bachiano