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Re: help tv comes on and goes right back off
A common problem with this model is the convergence IC's on the small signal module going bad and keeping the set from staying on due to protective shutdown circuits used. If that is your problem, the easiest fix would be to replace the module - Philips Part #313503710091, about $200 or so, or have a technican replace both IC's Stk392-120, Philips Part #932212344682 about $45.00 each plus labor and service charge of course. Other parts could be bad, but this is likely what I would try first.
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Your flyback has failed most likely...bad new is they are nearly impossible to find, This is a known issue on most of the models below. The site Tv Repair Kits can sometimes get replacements - but its not often.
This repair kit is known to work on Magnavox TV sets with the following Chassis/Model Numbers.
the DPTV305 - DPTV345 convergence repair kit at the following link should repair that issue. The kit includes the replacement parts and a CD with detailed repair instructions. http://www.tvrepairworld.com/
IF you can solder, you should be able to repair this yourself. Can you piost the parts that were replaced, I may have a substitute that will last longer. Also, I'd like to verify that all of the parts that should have been replaced actually were.