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Your problem seems to be convergence. This has to do with the video/ audio. If your Tv has no video/ audio and make a chirping sound when you turn on the TV, the problem is within the convergence chips. The symtoms you describes gets to the heart of your tv issue. However your tv can be fixed and it does not have to cost you an arm and one of your legs. If you think you can tackle this repair by doing it yourself then I suggest giving it a go. You can order the kit (audio/video)repair kit/chirping. The cost is reasonable, $68.00. It comes with all the replacement parts and thorugh instructions to guide you through the process. Give it some thought if you think you can fix the tv, if not have a professional do the job. Good Luck.
If the airflow is not blocked then indeed this is a sensor or a fan issue your going to need to ether have a repair guy come out and investigate the issue or get yourself a service manual and try doing the job yourself.
We beleave its a sensor by what you described.
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What you're describing is a repair issue. Unfortunately, there is nothing you can do through troubleshooting to correct that problem. There is an internal part that has to be replaced. If you're under warranty or have an extended service plan, the repair will cost you nothing.
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If the picture looks like a 3D one, the problem is a convergence issue. This can be as simple as poor connections at the pins of the convergence ICs or defective ICs. If you can solder you can probably fix this yourself. Please note that there are potentially dangerous high voltages inside the set even when unplugged.
If you wish to attempt the repair, please update this and I will provide additional details and instructions.
he is most likely trying to rip you off. You need to replace the convergence ICs. Theres a kit at the following link for your model that has both ICs and the 12 feed resistors plus step by step instructions to do the repair. Heres the link. this is the kit your model uses. http://servicemanuals.vstore.ca/product_info.php/pName/phillips-dptv-305-dptv345-convergence-repair-kit/cName/convergence-repair-kits
A convergence problem such as your describing can blow a fuse if you try adjusting it when the ICs fail. and its all centerd on the SSM panel the LSB panel wont be affected. Alot of TV repair men dont have a clue they just try to sell you some boards instead of repair the issue.
Blue,red and yellow wave coming up from the bottom of the screen on the lower left symptom is for busted convergence IC,you must replaced this IC in order that will works better again.STK 392-xxx ICs and it's associated resistor,this resistor automatically change value,can caused truoble even though you change the ICs.If you bring this to a service center they cost you $600 to $700,but if you buy the repair kit you can save more,don't wory it is very easy because there is intallation guide including in the repair kit. Feel free to ask whatever the result... click the link for sample picture guide step by step installation;