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Jeff
Joined: 24 Nov 2007
Posts: 8
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| Posted: Sat Nov 24, 2007 8:10 pm Post subject: Projection tv problem |
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Hi, a friend steered me to this forum, said some smart people are here. My problem: I have a 5 year old RCA p52929 that has worked good untill about a month ago when I went to rearrange the av wiring in back to make it a little neater. Probably coincidental but it has not worked since. The main power fuse is good and I get a small spark when I first plug it in. It will not fire up by remote or the front panel pushbutton. After removing the back cover and blowing out years of cobwebs I plugged it in (it had been unplugged for a few weeks) and it fired up long enough to give me a screen for a few seconds, then dead again. I've had no luck searching for a manual for it and I'm not sure how much good it would do me if I had one. I've played with most electronics for years but always shied away from tv's because of that hv shock I got from the first one I ever tried to work on. lol. Advice as to where to start looking? Thanks. Jeff
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sat Nov 24, 2007 10:17 pm Post subject: |
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AVS Forums is still a good source of info and experts in some fields... Try the
Rear Projection Units forum.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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Jeff
Joined: 24 Nov 2007
Posts: 8
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| Posted: Sat Nov 24, 2007 11:31 pm Post subject: |
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Will give it a shot. Thanks.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Nov 26, 2007 1:10 am Post subject: |
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Hey Jeff. I might have the service manual for this. I will check. Also it is very common for this problem when the convergence IC's go out. They are probably STK392's or similar. Have you ever changed ic's before?
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Fujifrontier
Joined: 20 Oct 2007
Posts: 354
Location: San Antonio, Texas
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| Posted: Mon Nov 26, 2007 2:54 am Post subject: |
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and wh would the convergence ICs go out all of a sudden? maybe a static zap through the video connectors, after unsettling the dust?
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Mon Nov 26, 2007 5:15 am Post subject: |
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| Fujifrontier wrote: | | and wh would the convergence ICs go out all of a sudden? maybe a static zap through the video connectors, after unsettling the dust? |
I snagged a Mitsu 43" CRT HDTV from a guy for free. Blue convergence was out and unfixable. It was the STK chips. In Mitsubishi's case, they spec'd the basic level chip and it turns out they were driving them too hard, and they'd die after a while. This pissed off a large quanity of people. I put in beefier versions of that STK and it's been running like a champ. 1080i HDTV for $25 in chips... can't beat it! 
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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: Mon Nov 26, 2007 8:17 am Post subject: |
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Goood score. I love deals like that.
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Tech support for nothing
CRT.
HD done right!
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Mon Nov 26, 2007 1:46 pm Post subject: |
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| AnalogRocks wrote: | | Goood score. I love deals like that. |
I got my 1271q because the artists' workshop that owned it said that the "green lens is broken". It was out of convergence. 
I got my Cerwin Vega VS120 speakers in trade for a pair of $50 crappy Altec Lansings my dad got at an online auction in 1995 (pre-ebay!) and gave me.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Nov 26, 2007 3:47 pm Post subject: Re: Projection tv problem |
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| Jeff wrote: | | Hi, a friend steered me to this forum, said some smart people are here. My problem: I have a 5 year old RCA p52929 that has worked good untill about a month ago when I went to rearrange the av wiring in back to make it a little neater. Probably coincidental but it has not worked since. The main power fuse is good and I get a small spark when I first plug it in. It will not fire up by remote or the front panel pushbutton. After removing the back cover and blowing out years of cobwebs I plugged it in (it had been unplugged for a few weeks) and it fired up long enough to give me a screen for a few seconds, then dead again. I've had no luck searching for a manual for it and I'm not sure how much good it would do me if I had one. I've played with most electronics for years but always shied away from tv's because of that hv shock I got from the first one I ever tried to work on. lol. Advice as to where to start looking? Thanks. Jeff |
I have the service manual if you need any info.
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Fujifrontier
Joined: 20 Oct 2007
Posts: 354
Location: San Antonio, Texas
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| Posted: Tue Nov 27, 2007 2:04 am Post subject: |
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damn it, now why can't i find any deals like that
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Jeff
Joined: 24 Nov 2007
Posts: 8
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| Posted: Tue Nov 27, 2007 4:43 am Post subject: Re: Projection tv problem |
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| macgyver655 wrote: | [
I have the service manual if you need any info. |
You have PM, my friend.
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Jeff
Joined: 24 Nov 2007
Posts: 8
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| Posted: Tue Nov 27, 2007 4:52 am Post subject: |
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| macgyver655 wrote: | | Have you ever changed ic's before? |
Yes. I work as a technition. Just haven't troubleshot a tv before.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Nov 28, 2007 7:30 pm Post subject: |
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Service manual is in the mail. Let me know if you have any problems with the software.
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Jeff
Joined: 24 Nov 2007
Posts: 8
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| Posted: Thu Nov 29, 2007 2:38 pm Post subject: |
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Much aprreciatted! 
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BradTheAggie
Joined: 08 Mar 2006
Posts: 651
Location: Oak Point, Texas
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| Posted: Thu Nov 29, 2007 2:45 pm Post subject: |
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Bad convergence chips was a well known flaw in early Mitsu RPTV's. I have a 55805 that went out around 3 years ago (about 4 years old at the time). I'm not a hardware ragu, so I got a tech out to look at it. He pulled the frame that contains the guts of the projector and took it back to his bench. Turned out to be bad convergence chips, which he replaced, and I was back in business.
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