So I had nearly the same thing, only no intermittent behavior - just alive one day, dead the next.
I took my unit to an electronics repair place. For $25 they diagnosed AC power supply failure and offered to charge me a total of $110 to refurbish the machine.
I balked since we paid far less for the unit on Ebay ($70 or so).
The store gave me the parts list for the estimate though - and I bought the parts and did the work myself. Total another $25 approx, plus time. If you are up for some small electrical work, get a soldering iron, some electrical solder and a soldering wick. You will need, some wire cutters / strippers, and a screw driver too. you may also want a Dremel tool with a cutoff wheel.
Anyway, just replace the first 4 diodes after the transformer leads to the main board and replace the transformer.
The diodes can be from any of a number of manufacturers - mine are Vishay part number 1N5408 - 0827J. The critical part of this part number is the first 6 characters. Put the diodes in using the orientation guide printed on the main circuit board (otherwise risk putting them in backwards).
The transformer part was a Stancor, part number P-8657 - it converts standard wall AC (117V at 50 or 60 Hz) to AC at 12V, 2A. This part is BIGGER than the OEM Hang Fung transformer. I used a Dremel tool and cut out the mounting pieces for the OEM transformer from the main housing. This made enough space to fit the new transformer. Now the new transformer is held in place by clamping action of the two-piece main housing when the screws are installed. I DO NOT KNOW IF THIS IS SAFE, SO YOU ARE WARNED!!!
Unit works fine now. Mouser electronics has the parts and will ship USPS in a few days.
Thanks to VY Electronics, Rochester, MN for diagnostic work.
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Tries the tv DVD player,play it with many other DVD discs too?Some the disc u trying to play it might just be bad like the reading shinning laser surfaces are scratches,smushes or grims and dirts on the disc reading surfaces?Tries washes the DVD disc,with some dish washing liquid,dries it with a cloth wait like two mins.Try the DVD disc again.If it have problems,but all DVD discs or with many other DVD discs too?Tries websites like Ebay.com or Amazon.com buy a Disc cleaning kit put Disc in the DVD player to play it have 50/50 chances to clean the DVD player laser eye reader.If not more like the DVD player laser eye it is dead.Tv still work fine?Don't take the tv aparts,tries to clean it laser eye manally,because,if u putting tv back together again might causes tv problems too.Just buy a DVD player unit plug it in the tv and play ur DVD Discs.DVD player extenal unit it very cheap these day.Don't take chances,like take ur tv aparts.
Try to check the back cover. If it is wet may be their was a short circuit. Have i t check to a qualified technician so that no further damaged maybe incurred by the unit. Power supply is affected if it was plug in for a long period of time with out unplugging it from the outlet. If it was turn on again it must be unplugged and rest for about half a day coz the power supply still received the current from the source.
Please specify if you have experience checking it with the technician?
Resetting the TV If the buttons on the remote AND the buttons on the TV case do not work (channels do not change and you cannot open or navigate the menu), the TV has stopped responding. Reset the TV as follows:
NOTE: Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time.
1.Unplug the TV power cord from the power outlet. 2.Unplug any connected devices (DVD, Set-top boxes, etc...) 3.Press and hold the TV power button for five seconds. 4.Plug the TV power cord back into the power outlet and turn on the TV. 5.Open the on-screen menu to confirm that the TV is responding again. 6.Turn off the TV and reconnect the devices. 7.Turn on the TV. Give the brand name and the model number..