I saw your post at http://www.fixya.com/support/t15374-nec_plasmasync_42mp1 and you said you replaced some parts. I was not sure if you had a 42mp1 or something else. What model did you fix? Is the part number on the power supply board PKG-1720? Do you have the parts designations for where it is on the board (something like Q527, etc.)?
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This tv is capable of both digital and analog settings. It is however recommended for use with digital components. You can reference the manual at necdisplay.com. This should be a helpful reference with setting up your newly aquired NEC PlasmaSync. Have fun with it!
Its the power supply board. If you cant get the whole board, check your transistors theyre most likely FSXXX-X (part #). Replacing them should solve the problem. And they're only about a dollar each so youll save a bunch too but it requires a little more work.
you need to check the supply outputs. unplug the panel from the supply and check with an anolog meter. if the supply runs for 10 secs it will lock out.
or u could start with the resistors and FETs in the supply.
Yeah, it's the power supply. I've ordered (2) of these power supplies used, and the same problem seems to be happening with both. The transformers on the power supply board (namely, the 170+ volt one) are the problem. You have several test points on the power supply board which you can touch with a voltmeter to see if your television is getting the correct voltage . Mine made a a high pitch squeal which indicated which transformer was bad. If you find a place to get the transformers new - id like to know, because mine is still non functional because of this and the fact that a new PS board is over $600.
Check the +170 volt test point on the power board (not the power filter board, the one that the plug comes into) but the one to the right of that board. It has a 5v test point (TP +5v) , a +170 and a +70. I've found that the +170 transformer goes bad, and won't allow you to adjust the voltage using the pot screw.