CurtPalme.com Home Theater Forum

CIR Engineering · Posted: Wed Apr 22, 2009 9:36 pm Post subject:

AND all controls work even though the image is shaking. AND no error codes.

craigr

HaydnG90 · Joined: 22 May 2006 Posts: 1356

Thanks for trying. But I'm a bit confused when you say my 421 might be OK. Did you reattach my old chip? Which chip gave you the control back again, albeit with a shaky image? Do you suspect another component is the culprit for the lack of control you observed on my YA board.

CIR Engineering · Posted: Thu Apr 23, 2009 1:56 pm Post subject:

**Curt Palme** · Posted: Thu Apr 23, 2009 3:02 pm Post subject:

Got another report of a possible Ya failure this morning:

After installation of the input board, we found no any message that show us there is any problem. No error message was shown at all.

But definitely no any response when I'm adjusting all the setting except the number digit shown it works.

I've asked him to email me a pix of his IC421 to see if our theory of a bad run of chips holds true. I've also linked him to this thread. Sad

HaydnG90 · Joined: 22 May 2006 Posts: 1356

CIR Engineering · Posted: Thu Apr 23, 2009 3:42 pm Post subject:

CIR Engineering · Posted: Thu Apr 23, 2009 3:44 pm Post subject:

One more thing with the Haydn / Curt hybrid board... The image stops shaking while I am sending commands. For example, if I hold down the "up" button for say gain (or drive, or center...), the image stops shaking as long as the register is changing. Is this what others have seen with bad IC421's on shaking G90's?

craigr

HaydnG90 · Joined: 22 May 2006 Posts: 1356

**Curt Palme** · Posted: Thu Apr 23, 2009 4:09 pm Post subject:

HaydnG90 · Joined: 22 May 2006 Posts: 1356

CIR Engineering · Posted: Thu Apr 23, 2009 4:47 pm Post subject:

CIR Engineering · Posted: Thu Apr 23, 2009 4:53 pm Post subject:

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

I'm curious as to the voltage readings at pins 31 and 71. And does the voltage fluctuate at all. Also if there is fluctuation during an adjustment.

**Curt Palme** · Posted: Thu Apr 23, 2009 5:49 pm Post subject:

CIR Engineering · Posted: Fri Apr 24, 2009 3:07 am Post subject:

CIR Engineering · Posted: Fri Apr 24, 2009 2:48 pm Post subject:

Thought you guys might like to see the process...

IC421 removed and YA prepped for new IC.

Donor IC421 cleaned and ready for install.

New IC421 on YA before cleaning.

And that was a lot of work!

craigr

**Curt Palme** · Posted: Fri Apr 24, 2009 2:51 pm Post subject:

And the chip number of yesterday's 'bad YA board' email is.....

CIR Engineering · Posted: Fri Apr 24, 2009 2:55 pm Post subject:

Surprise surprise Evil or Very Mad

I am so glad I have a YA here with a different IC421 serial number... my parts machine with 7000 hours.

craigr

**Curt Palme** · Posted: Fri Apr 24, 2009 2:57 pm Post subject:

Too bad the number of G90s out there aren't higher, this reeks of a ripe class action lawsuit.

CIR Engineering · Posted: Fri Apr 24, 2009 3:02 pm Post subject:

We are going to have to come up with a viable substitute. The ironic part is that low hours machines are more likely to have the problem IC421...

Earlier serial number machines have different IC421 serial numbers and the earlier machines tend to have high hours on them. My primary G90 only had 600 hours when I got it (now at 1100) and I was so happy to have a low hours unit. Now it seems that high hours has a much better chance of running reliably for even longer. My 600 hour machine has the bad serial and my 7000 hour machine has a different serial.

craigr