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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Dec 12, 2009 5:19 pm Post subject: |
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Besides, there maybe someone working on a fix for the ic421 replacement.
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Ted White
Joined: 21 Apr 2009
Posts: 57
Location: Michigan
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| Posted: Sat Dec 12, 2009 5:33 pm Post subject: |
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The G90 is a liability at this point, that much is clear. That was cool of you to post that thread, and I'll admit I didn't read it all, but it didn't sound very promising.
I'm looking at an investment in calibration and Mike & Craig mods (like others are here) and it could all be a waste if the ic421 decides to take a permanent vacation.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Dec 12, 2009 6:19 pm Post subject: |
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I'm still wouldn't base a decision on the vague possibility of this chip failing. That type of logic would then say its not worth the chance on any device because even if an available part failed the device may require recalibration after repair. The you would base your decisions on cost. Well same thing here. Used boards are available so even if you had this ic failure you can just locate and replace with a used board.
I dont care what the device is it has the potectial of failure. There are parts on plasmas and LCD flat panels that are no longer available. The only advantage is there are probably a more abundance of used parts.
If you think your G90 now has little value, I'll be glad to take it off your hands... 
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Ted White
Joined: 21 Apr 2009
Posts: 57
Location: Michigan
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| Posted: Sat Dec 12, 2009 7:11 pm Post subject: |
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| macgyver655 wrote: |
That type of logic would then say its not worth the chance on any device because even if an available part failed the device may require recalibration after repair. |
I hear you. Other devices could be repaired, however. That was my point.
Not getting rid of her just yet. Waiting to see what the mods are all about.
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Sun Dec 13, 2009 6:56 am Post subject: No need to panic |
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Ron has made some very valid points. I wouldn't dump the G90 solely on the unlikely event of the IC421 going bad. There are many other reasons why a unit will go AWOL and you may be lucky and pick up a parts pj for very little and have a working YA board. If someone comes up with a workaround then it'll be a complete non-issue.
A couple of things to consider. Firstly as Ron already mentioned, the failures seem to occur early in the life of the G90, irrespective of age. My IC421 failed at about 1500 hours. If your pj has say 2500+ chances are you'll be OK. The one I'm using now came out of a machine with 5500hrs and has been trouble free so far. Secondly, there seem to be 2 batches of IC421 with different serial numbers, used during the production run. All the failures come from one batch as far as I know.
btw If you haven;t already done so, swap out the Dallas chip before it fails. Also some have recommended putting the G90 on a UPS. Those who've done so appear to experience fewer issues.
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Ted White
Joined: 21 Apr 2009
Posts: 57
Location: Michigan
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| Posted: Sun Dec 13, 2009 2:05 pm Post subject: |
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Really? Dallas chip change may help avoid the ic421 issue?
Look, I love the G90. I sold 25 from 2000 thru 2002. LOve them. Not looking to bail and have been excitedly awaiting G90 mods for a long time. Now that they're almost here I'm not bailing.
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Sun Dec 13, 2009 2:24 pm Post subject: |
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There's no evidence the Dallas chip has anything to do with the ic421 failures directly. When my IC421 went bad it was during a period when we had a lot of thunderstorms. I wonder if a power surge damaged what appears to be a defective chip. I now run the G90 on a high quality power conditioner with built in surge protector and haven't had any problems in 18 months.
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Ted White
Joined: 21 Apr 2009
Posts: 57
Location: Michigan
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| Posted: Sun Dec 13, 2009 2:26 pm Post subject: |
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What power conditioner are you using?
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Sun Dec 13, 2009 3:19 pm Post subject: |
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It's an APC H15.
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Sun Dec 13, 2009 3:24 pm Post subject: |
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The Dallas chip does not have anything to do with the IC421 failure. However, the Dallas chips usually last 10 years, give or take, and when they go you loose your geometry data, focus data, gray scale data, serial number, chassis hours, and tube hours. If you pull the Dallas chip you can send it to me to make a copy and then I'll send both IC's back to you. I usually flip them the same day so you will get them back in just a few days because I am in Chicago.
craigr
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Dec 13, 2009 3:34 pm Post subject: |
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| CIR Engineering wrote: | The Dallas chip does not have anything to do with the IC421 failure. However, the Dallas chips usually last 10 years, give or take, and when they go you loose your geometry data, focus data, gray scale data, serial number, chassis hours, and tube hours. If you pull the Dallas chip you can send it to me to make a copy and then I'll send both IC's back to you. I usually flip them the same day so you will get them back in just a few days because I am in Chicago.
craigr |
Hmmmmmmm.......... 
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sun Dec 13, 2009 7:43 pm Post subject: |
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| macgyver655 wrote: | | CIR Engineering wrote: | The Dallas chip does not have anything to do with the IC421 failure. However, the Dallas chips usually last 10 years, give or take, and when they go you loose your geometry data, focus data, gray scale data, serial number, chassis hours, and tube hours. If you pull the Dallas chip you can send it to me to make a copy and then I'll send both IC's back to you. I usually flip them the same day so you will get them back in just a few days because I am in Chicago.
craigr |
Hmmmmmmm.......... |
You're being awfully reserved today Mac. I think we need an emoticon that bites its tongue.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Dec 13, 2009 7:50 pm Post subject: |
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| AnalogRocks wrote: | | macgyver655 wrote: | | CIR Engineering wrote: | The Dallas chip does not have anything to do with the IC421 failure. However, the Dallas chips usually last 10 years, give or take, and when they go you loose your geometry data, focus data, gray scale data, serial number, chassis hours, and tube hours. If you pull the Dallas chip you can send it to me to make a copy and then I'll send both IC's back to you. I usually flip them the same day so you will get them back in just a few days because I am in Chicago.
craigr |
Hmmmmmmm.......... |
You're being awfully reserved today Mac. I think we need an emoticon that bites its tongue. |
Yes, I'm trying something new.....
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