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Registered
Join Date: Dec 2006
Location: Northern VA
Posts: 585
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Panasonic Rear Screen Projection TV Repair
My 5year old Panasonic PT47WX42F rear screen projection TV has suddenly deleloped "convergence" problems.
Specifically - I am unable to use the remote adjustment capability to get the red, blue and green guns back in alignment. > the red is way off ... I googled the problem and seems as if my malfarction is not that unusual with my model > one DIY'er has written a pretty comprehensive DIY paper on the procedure... DIY - ~$12.00 in parts > two IC chips [STK-392-110] // or pay the repairman approx $450-500. I figure > I've pulled BMW2002 engines > installed Weber DCOE 40 sidedrafts.. dropped the 3.0 out of my SC.. why should I be afraid of trying something electronic.. > I did build some Heathkit walkie talkies back in the 60s.. Ordered the 2 IC chips, low wattage solder station, solder wick, desolder pump, heat sink compound.. IC remover tool... Looking for any words of wisdom... one thing has me a bit spooked > the de-energize of the TV/CRT tube.. I'm not planning on sticking my fingers back that far in the TV.. but theres considerable voltge back there... Unplugging all the wires from the circuit board > make sure they are labled etc...
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Kim Langley 2012 Carrera / 991.1 80 911SC 97 C230 73 BMW 2002Tii |
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01-10-2008, 11:51 AM
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Unregistered
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
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I had the same problem on my Philips. The guy came out, replaced two IC chips (soldered and glued down to heat sinks) and charged $300.
I know squat about electrical stuff so it was money well spent, but I asked for the old parts. I keep them on my desk at work to remind me. BTK22 STK392-120 is the part number on them, I googled it and they are about $12 each. If there's a next time i'll do it myself. Edit, changed zenith to philips. I had a zenith before, total POS. Made in mexico with the cheapest parts fropm korea or china or taiwan. gave it away after 5 years. have the philips now and it isn't perfect but 100% better than the zenith. customer service sucked too. Last edited by sammyg2; 01-10-2008 at 02:36 PM.. |
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01-10-2008, 01:06 PM
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Unfair and Unbalanced
Join Date: Jul 2004
Location: From the misty mountains to the bayou country
Posts: 9,711
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Probably going to be easier than you think. No magic there. Get it nice & clean after you remove the old chips. Make sure your solder joints are shiny.
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"SARAH'S INSIDE Obama's head!!!! He doesn't know whether to defacate or wind his watch!!!!" ~ Dennis Miller! |
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01-10-2008, 01:50 PM
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Registered
Join Date: Nov 2000
Location: AZ
Posts: 8,414
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Most of those old light guns are liquid cooled, and the liquid can/will solidify or get particulates/mold which will throw the focus off (so I'm told). It sounds like a fun project, but just make sure you solved the problem before buttoning everything back up. Also, most panasonic TV's have service manuals that you can purchase/download for under $10 (check with www.completeservicemanuals.com). They cover assembly/dissasembly, trouble shooting, how to get into the service menu, etc.. Definitely worth it IMO, if you are planning on a DIY fix. Anyway, Good luck!
Side note: I am having issues with a Panasonic TV myself. It's a newer LCD Rear projection that has developed a green blob on the screen. The only fix is to replace the complete "light block" (projection unit) to the tune of $800+, and it's conveniently just past the 1 year warranty period. That is over half of what I originally paid for the thing! Oh, and my Panasonic cordless home phone is a worthless POS (nobody can hear me on it). So, if you are thinking of upgrading to another Panasonic, keep that in mind. |
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01-10-2008, 01:57 PM
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