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stereodave70
Joined: 15 Sep 2006
Posts: 138
Location: Bloomington, IL
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| Posted: Thu May 06, 2010 10:38 pm Post subject: G70 RED CONVERGANCE PROBLEM |
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I'm not sure if the picture is going to work, it doesn't show very well what is going on. The red image is shifted to the left and very noisy. I do know that it is not temperature related, it is in all input sources, and it is present even on menu functions. I do have another G70 at a friends house that he has not set up yet that I can "barrow" parts from. I am hoping this is an easy fix, any help is greatly appreciated.
thanx
Dave
_________________
Be carefull what you wish for...sometimes you just might get it !!!
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu May 06, 2010 10:58 pm Post subject: |
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THe convergence board is bad. Fifth one in 2 weeks I've heard about. You should borrow his and send yours in for repair, as they fail regularly, and guaranteed his loaner will die shortly as well.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu May 06, 2010 11:10 pm Post subject: |
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Curt, without giving away your IP, is there a specific component that keeps failing? Something the Sony design drives too hard that we could put a heat sink on or something to increase long-term reliability?
SC
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu May 06, 2010 11:27 pm Post subject: |
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| ecrabb wrote: | Curt, without giving away your IP, is there a specific component that keeps failing? Something the Sony design drives too hard that we could put a heat sink on or something to increase long-term reliability?
SC |
LOL. Why would he give away info to help prevent failures that he will eventually make money on? 
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Fri May 07, 2010 1:14 am Post subject: |
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Yeah, you're right, Mac. In fact, why bother telling anybody to even get their mechanical setup right? The added thermal stress on the convergence boards will make for more repairs. Same with contrast... Sell some more tubes. Hey, I know... Maybe we could even kind of keep it a secret what kind of bolts to use to mount the projectors; that way Curt can sell a few more machines to guys that have their machines fall off the ceiling.
Huh... I wonder why Curt made it public that he recommends against doing fan mods... After all, if the machine runs hotter, it'll just be good for business.
SC
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri May 07, 2010 1:19 am Post subject: |
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It's not a secret that the convergence board runs red hot, even with proper setup. Doug Baisey was always the one saying that an improper setup runs the convergence board hotter, I don't buy it. THe later G70 convergence board did have a fan on it, a little one like the 12XX series did behind the rear IR sensor, but I've had those boards fail too, so I don't think it helps any.
I don't like fan mods unless they are completely proven like the E'home ones, because reducing air flow increased the heat buildup, but to the point where the board is literally cooked so that I can't repair it.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri May 07, 2010 1:25 am Post subject: |
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Hahahahaha..... see, I told you....
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri May 07, 2010 1:28 am Post subject: |
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| ecrabb wrote: |
Huh... I wonder why Curt made it public that he recommends against doing fan mods... After all, if the machine runs hotter, it'll just be good for business.
SC |
Hehehehe.... even he has admitted he slipped up a few times..... 
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri May 07, 2010 1:29 am Post subject: |
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I like fixing breakdowns that occur 'naturally', not ones that are human induced.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri May 07, 2010 1:31 am Post subject: |
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| Curt Palme wrote: | | I like fixing breakdowns that occur 'naturally', not ones that are human induced. |
Yeah, those human induced ones produce more smoke then dollars on the repair bench.....
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri May 07, 2010 1:33 am Post subject: |
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There's that. BTW, today's success rate is 100% on flat screen monitors. 3 out of 3 with bad power supplies. 2 more to go, I predict that the 32" will be a cracked screen though. 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri May 07, 2010 1:37 am Post subject: |
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Repairing the supplies or replacing?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri May 07, 2010 1:38 am Post subject: |
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Hey, what kind of a tech would replace a whole power supply? Oh wait, I know... MOST OF THEM!
NOpe, repaired every one of them. The common problem... you know... power cord not plugged in! 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri May 07, 2010 1:41 am Post subject: |
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LOL......way to go..... 
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Phil Smith
Joined: 08 Mar 2006
Posts: 7717
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| Posted: Fri May 07, 2010 1:52 am Post subject: |
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In fact, why bother telling anybody to even get their mechanical setup right? The added thermal stress on the convergence boards will make for more repairs.
Actually that's not true. If it was, PJs in side by side stacks, which are woefully out of normal mechanical alignment, would be burning up left and right.
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Sat May 08, 2010 2:47 am Post subject: |
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| Curt Palme wrote: | It's not a secret that the convergence board runs red hot, even with proper setup. Doug Baisey was always the one saying that an improper setup runs the convergence board hotter, I don't buy it. THe later G70 convergence board did have a fan on it, a little one like the 12XX series did behind the rear IR sensor, but I've had those boards fail too, so I don't think it helps any.
I don't like fan mods unless they are completely proven like the E'home ones, because reducing air flow increased the heat buildup, but to the point where the board is literally cooked so that I can't repair it. |
If the DC board runs hot, then how can you guarantee that your fix won't fail as well?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat May 08, 2010 3:27 am Post subject: |
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| Spanky Ham wrote: | | Curt Palme wrote: | It's not a secret that the convergence board runs red hot, even with proper setup. Doug Baisey was always the one saying that an improper setup runs the convergence board hotter, I don't buy it. THe later G70 convergence board did have a fan on it, a little one like the 12XX series did behind the rear IR sensor, but I've had those boards fail too, so I don't think it helps any.
I don't like fan mods unless they are completely proven like the E'home ones, because reducing air flow increased the heat buildup, but to the point where the board is literally cooked so that I can't repair it. |
If the DC board runs hot, then how can you guarantee that your fix won't fail as well? |
I can answer this one for Curt and he can correct if he does something different. This falls under the same catagory as the early STK convergence chips in a lot of RPTV's. The original chips were not built to handle the current used in the circuit and is why they were such a common failure. Later chip designs could handle these currents easily and as such run much cooler then the originals and would then last much longer.
The key is a) knowing this and b) knowing what chip to replace it with.
Same goes for many of Curts repairs. A) knowing when a part is being over taxed and B) knowing what part to replace it with so it will last longer...... Of course on some occasions more then just 1 part replacement is required to achieve a smoother/cooler running circuit...
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat May 08, 2010 3:44 am Post subject: |
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| Spanky Ham wrote: | | Curt Palme wrote: | It's not a secret that the convergence board runs red hot, even with proper setup. Doug Baisey was always the one saying that an improper setup runs the convergence board hotter, I don't buy it. THe later G70 convergence board did have a fan on it, a little one like the 12XX series did behind the rear IR sensor, but I've had those boards fail too, so I don't think it helps any.
I don't like fan mods unless they are completely proven like the E'home ones, because reducing air flow increased the heat buildup, but to the point where the board is literally cooked so that I can't repair it. |
If the DC board runs hot, then how can you guarantee that your fix won't fail as well? |
I do some mods that help the chips run cooler. Haven't had one board come back in the 8 years I've been replacing them. INteresting that 5 boards failed in the last week though. Guess there's still a bunch of G70 owners out there.
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Sat May 08, 2010 4:10 am Post subject: |
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Thanks for the info.
| Curt Palme wrote: | | Spanky Ham wrote: | | Curt Palme wrote: | It's not a secret that the convergence board runs red hot, even with proper setup. Doug Baisey was always the one saying that an improper setup runs the convergence board hotter, I don't buy it. THe later G70 convergence board did have a fan on it, a little one like the 12XX series did behind the rear IR sensor, but I've had those boards fail too, so I don't think it helps any.
I don't like fan mods unless they are completely proven like the E'home ones, because reducing air flow increased the heat buildup, but to the point where the board is literally cooked so that I can't repair it. |
If the DC board runs hot, then how can you guarantee that your fix won't fail as well? |
I do some mods that help the chips run cooler. Haven't had one board come back in the 8 years I've been replacing them. INteresting that 5 boards failed in the last week though. Guess there's still a bunch of G70 owners out there. |
If there are, then why aren't they replying to my poll? 
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