CurtPalme.com Home Theater Forum

mtmelvin · Joined: 18 Mar 2006 Posts: 153 Location: Bay Area, CA

My G90 has been rock solid for the past couple of years. During that time I've not adjusted much except occasionally re-aligning the Blue and Red centers to Green.

Today I decided to try my hand at another full set-up. Isn't this when things usually go wrong? I should have known.

Anyway, the error occurred when I was adjusting the Magnetic Focus on Green. As I reached the end of the range for the 6PD (if I remember correctly) the set shut off and showed Error Code 89 (orange). I unplugged the power cord and plugged it back in. The G90 fired back up and the MG Focus data had not been saved, so it was back at default. I again began adjusting the MG Focus and when making the same adjustment the projector turned off again.

Now I cannot get the projector to stay powered up at all. It continues to display Error 89 and shuts down immediately when I turn it on.

Any thoughts? I've had tons of bad luck this past week or so. I should have known better than to start messing with the projector...

Thanks in advance.

-Mark

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

The code 89 is a protection code for the EBH board. The protection is triggered when the current draw exceeds a predetermined amount and causes the unit to go into shutdown. This is probably caused because your adjustments are at an extreme. This could be because another adjustment is off and you are trying to compensate for it with this adjustment. If you cant get the projector on long enough to back off the adjustment that caused the shutdown even if it wasn't saved then you may have to do a reset. Of course there could also be parts damage at this point as to why if wont restart.

MikeEby · Joined: 24 Jun 2007 Posts: 5237 Location: Osceola, Indiana

Does it error-out without a source?

Mike

mtmelvin · Joined: 18 Mar 2006 Posts: 153 Location: Bay Area, CA

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

The protect circuit monitors the + and - 25v on the EBH board. These voltages feed the 2 STK392-040 chips on that board. These chips dont like to be strained or they short out. This could be what happened but would have to be verified. I'm not sure if the projector will run with this board removed but you may want to give it a try. If it will run for a short time you could neutral your settings then reinstall it. But just remember that one or both of these chips could be shorted. There are tests for this also but require some DMM knowledge.

mtmelvin · Joined: 18 Mar 2006 Posts: 153 Location: Bay Area, CA

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Here's what I would try. The EBH and EBQ boards are identical. You can swap those boards and see if your error code changes to orange 8A or stays orange 89. This would determine if there is a board problem or adjustment problem. Just dont leave it on for long if it stays on because if the extreme adjustment is saved and thats what damaged the EBH board then the EBQ may also get damaged. Just remember your doing this with some risk but this is the risk that techs take when diagnosing a problem. So if your not comfortable with this risk then dont do it but testing and unsoldering and testing would then be required.

mtmelvin · Joined: 18 Mar 2006 Posts: 153 Location: Bay Area, CA

Hmmm, ok I swapped the EBH and EBQ boards and the error code remains 89. So you think this indicates an adjustment problem? If so, what can I do because the projector won't stay powered on long enough to access any menus or adjustments?

-Mark

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Interesting. Ok, put the boards back in their original place. Now on the EBH, disconnect CN137, CN138 and CN139 and try power on and see if you still get the code. If you do then disconnect CN136 also leaving the others still disconnected and try to start again and see if you still have a code. Post back..

mtmelvin · Joined: 18 Mar 2006 Posts: 153 Location: Bay Area, CA

Will do! Stand by...

mtmelvin · Joined: 18 Mar 2006 Posts: 153 Location: Bay Area, CA

You're a genius!!!

With CN137, CN138, and CN139 disconnected the projector powered on and there was no error code. So I was able to access the Service Menu and restore the Service Data (which, fortunately is where I stored my set-up). So now it's back to normal and working well!

And guess what... I have lost my interest in re-doing the set-up. At least for a while!

Thanks so much for your help. I'm so relieved that there isn't any damage Smile

Take care.

-Mark

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Very nice....... Thumbs Up

**AnalogRocks** · Posted: Thu Sep 03, 2009 2:04 am Post subject:

Good going Mac Thumbs Up

CIR Engineering · Posted: Thu Sep 03, 2009 2:36 pm Post subject:

So was the problem only with "your" adjustment data; and after you restored default (or 128) settings the projector stays on now? Did you save your focus and astig data to the servicew block by holding down the MEMORY button for several seconds and confirming a save? Did you have the error after doing the service save?

I don't understand why the G90 would not power up with no source connected if all that was wrong was a memory block. If you set up astig, it is for the memory you are using and does not effect any other memory block unless you do a full service value save with confirmation.

However, if you were in EXPERT mode and doing 6-pole at all nine quadrants than this is a universal memory for all modes and could cause the problem you had. Were you in EXPERT mode when this happened?

Curious...

craigr