The power comes on. The screen stays black. The logic board on the inside blinks once every 5 seconds. Will this be the logic board that's bad or perhaps the y sustain board??
SOURCE: Samsung Plasma 42" TV Screen problem
panel migth be bad, connection/connector on it might have loosen up already! it it has a warranty then return it at once and ask for a new one! its what you've paid for.
SOURCE: SAMSUNG PLASMA SPN4235 BLACK SCREEN W/SOUND
SOUNDS LIKE IT COULD BE Z-SUS BOARD...POWER SUPPLY IS PROBABLY OK IF YOU HAVE SOUND...WHEN Y-SUS FAILS ..IT USUALLY CAUSES SET NOT TO TURN ON AT ALL...CALL ANDREWS ELECTRONICS IN CALIFORNIA WITH MODEL NUMBER...THEY WILL GIVE YOU PART # AND PRICE...JOE ACE
SOURCE: Short circuit on the "Y" sustain board
The problem is heat!!! If the tv has fans they should be checked for normal operation,although on the early samsung models there were none, and the problem is that the panel drive buffers are getting to hot due to inadequate cooling. This is most apperent when tv is mounted to close to the wall, also external fan blowing on the rear left side will dissapate the heat. It is a problem on early Samsung and Electrograph 42 " plasma models. Hope this helps.
Did it work with the Y-sustain board replaced? Likely if it did not work then there is an issue with the capacitors on the Y-sustain board and the power board. Check these caps for failure and replace them with the exact type. Likely the caps are blown and cause voltage loss in one or both boards.
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