What else can I test in order to figure out this problem.

I was given for free a Samsung 61" DLP TV. MODEL # HLP6163WX/XA- Atlantis.

I was told that family was watching tv one night had a power surge/outage. Next day tv buzzed no picture.

I pull light engine assembly out, cleaned everything, open color wheel to clean, found shattered..

Ordered new 1ch + New Ph bulb,

Mean while reassembled everything to test power board voltage. ..

I plug the tv in it automatically turns on, lamp(green) light blinks & lamp powers on, color wheel spins, lamp turns off, wheel stops.

Then all the lights in front panel blink(Timer/Lamp(green), standby/Temp(red).

New color wheel, new bulb, new ballast..

with multi-meter, line into ballast at start up is 318v(thought 320vmin)original had reading of 299v..?

checked Power board voltage test points some spot on but 3 where (less than) board markings, so i swapped out 1 from a more functional tvset. Similar model-

-- improvement to all but one test point (80v)actual reading(72v).

i jumpered the door switch/did same to temp for testing and no change. .i ordered new temp sensor & door switch still no change. ..

i noticed during the power cycle it does if i try to access service menu (mute+182+power), screen flashes grayish then back to black. ..

Not sure what else i should be checking/testing or if im still at a power board issue.? Thinking it's dmd board or digital board now, where do i check for failure?? Both expensive. !

Is it really possible every electronic board in this tv failed. .?