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amigaman
Joined: 07 Mar 2011
Posts: 50
Location: Missouri, United States
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| Posted: Sun May 06, 2012 1:14 am Post subject: G70 Error 30末What fails on the DC board? |
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Hello all.
I recently found a G70 for free, with some issues.
The set runs for a couple seconds, and shuts down with an error code of 30. Now, I know that means it's the DC board at fault, but what on that board usually fails?
The previous owner said there were some red convergence issues, with a jagged red line running across the top of the screen. Now I can't get it to stay on long enough to test it, but when the tubes come on for that 1-2 seconds, I can see some raster distortion and a curved line at the bottom of the tube.
I'm thinking one of the two STK-392-220 SIPs are bad, based on previous experience with them in NECs. All components look fine, with no signs of burning/bulging/damage. I have reseated the board and the resistor packs.
Any ideas? The SIPs are available, and I'd like to save (and not replace the whole) DC board.
Thanks in advance!
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sun May 06, 2012 4:23 pm Post subject: Re: G70 Error 30末What fails on the DC board? |
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| amigaman wrote: | I'm thinking one of the two STK-392-220 SIPs are bad, based on previous experience with them in NECs. All components look fine, with no signs of burning/bulging/damage. I have reseated the board and the resistor packs.
Any ideas? The SIPs are available, and I'd like to save (and not replace the whole) DC board.
Thanks in advance! |
yes, that's usually it. Replace with higher voltage rated chip and use fresh thermal paste
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amigaman
Joined: 07 Mar 2011
Posts: 50
Location: Missouri, United States
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| Posted: Sun May 06, 2012 7:12 pm Post subject: |
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Excellent. Would you happen to know what number a good higher voltage equivalent would be? I plan on replacing both.
Thanks!
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sun May 06, 2012 7:45 pm Post subject: |
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| amigaman wrote: | Excellent. Would you happen to know what number a good higher voltage equivalent would be? I plan on replacing both.
Thanks! |
no but if google the part number on the old one along with "failure" or "higher voltage rated replacement" it will come up with the new one.
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amigaman
Joined: 07 Mar 2011
Posts: 50
Location: Missouri, United States
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| Posted: Sun May 06, 2012 9:30 pm Post subject: |
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From what I've found, the STK392-220 is the highest rated of that type. There's a 230 listed on a few sites, but no information or other references.
I'll probably go with the original IC (STK392-220), unless anyone has any other ideas.
I'll keep looking first.
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