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Re: 50PW350 won't turn on
There are no user serviceable parts on these flat panel tvs.
Use your warranty if available. This is why buying the extended warranty on expensive electronics is a good policy.
Find a nearby electronics repair shop and get it checked over.
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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time; especially to Plasma TVs.
Are you comfortable working with the high voltage innards of a plasma TV, including the use of a Multimeter, Soldering iron or gun, and electrical safety? If so, you will have to inspect the insides and look first at basic items such as the fuses, but continue diagnostics from there to all components, using care not to electrocute yourself. If you are not comfortable with such a thing, then professional repair or replacement of the unit is recommended. LCD televisions do not have such high voltage driver issues and do not suffer from burn in like plasma screens do, plus use substantially less electricity.
In either case, the symptoms you describe tend to come from dirty line power, so the acquisition of a UPS (Uninterruptible Power Supply) that will perform Automatic Voltage Regulation is highly recommended to scrub the A/C current and swap to battery if things get to a level that would potentially damage the TV. This kind of investment can increase the life of A/V equipment by twice or more.
Maybe you have disconnected the small cable which connects the power button to the motherboard. Or your charging unit at the back of your laptop is faulty, take the cover off and click the button without it on maybe a alternative. Only other solution would be have you had a powercut recently?
Your valve switches are defective. Sometime they will do that if you recently had a boil over and they have got wet. Try turning the breaker off for 24 hours to see if the fixes the problem.http://www.on-timeappliance.com/ovenrepair.html