I have a Philips Model # 30PW633R37A Chassis # L01.1UAC-7638 Manuf. 11/03. After watching for a short while with everything normal there will be a loud pop, then no pic, no sound followed by what sounds like a relay clicking repeatedly. The power light on the front panel remains lit green. Occasionally the pic and sound will return but only temporarily as symptoms will return. If I power off then on everything will be normal again for a few minutes, then symptoms return. I have soldering experience and PC monitor repair experience, so I have no problem going after a repair. Any ideas?
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The high pitched sound means there is a short on the Deflection board which is the middle board. Most likely it is a shorted transistor or capacitor on that board. Not a do it yourself fix. Someone needs to get the chassis into the service position and check for shorted parts on that board.
Most likely the blue picture tube arched and shorted out the horzontal output transistor.Very common problem with this chassis.Now if you have an electronics background you can most likley fix it, if not you will be dealing with finding a high voltage leak consisting of 31,000 volts which can kill you.That pop you heard was the high voltage leaking to ground.
The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main 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. 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. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
That is the DPTV310 chassis I believe the problem could be in the power supply input board or the large signal board. I have a source to locate those boards used if you would like me to post it. They sell parts cheap and all parts are in good working order. I have used their parts many times.