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From your description, I can't understand the problem of your TV well. "Half white half black screen with video signals"; you describes what? Please give me more details about the fault, as clear as you can, so that I can help you. Send these details to me by Fixya. OK.
I have a PX-42VM5A and my Power supply is a PNT-426 (by Sanken Electric Co. LDT). Here are my specs: INPUT: AC 100-240V; OUTPUT: (there are nine outputs) +170v 1.6A; +60v 1.6A; +5v 4.0A; +2.5v 1.9A; +3.5v 1.9A; +7v 1.0A; +12v 0.5A; +12 v 1.9A and +6v 1.2A
Check to be sure that there is no voltage on the input line. You don't indicate what input you are using. Since the set appears to work without an input connected, try looking at the input cable. Also, if the problem is internal to the set, shorting the input jack would cause the same behavior. Please update this with what you find.
The fault is on the PSU board.
Replace D 28 on the PSU board. You have to use a fast diode (I used BYW 95). Replace also the
330 uF/35V and the 22uF/50V near to this diode.
After this the unit will work perfect.
Try to call the Company Tech Support and ask the part. Thats the perfect place to get your perfect parts. Or get your part number and search the web for inexpensive one but make sure you get the right one. Good luck