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The issue here could be a capacitor within the power circuit. Also could be a power transistor that is faulty. On the easy part it could be a matter of reprogramming the unit but I doubt it.
Sounds like it may be a power supply issue. I don't know what "modules" the tech replaced, but I would have advised you to scrap the TV for a newer model as they can get pretty expensive to find and replace parts of the older rear projections. Sorry I can't be more help to you.
Thats the great sound of Exploding capacitors on either the power supply board. or another one in there. Now the set is in fault protection. It tried to warn you with the RED blinking LED that there was something amiss by shutting itself down. When you unplugged you reset the error and allowed it to do it again.
you have lost your chroma (color) circuit the sepia you are seeing is just the black & white picture black and, white is adjustable from red to blue to green tint so; your sepia is an overloaded red circuit i could fix this but, i'm here and, you're there so take it to a serviceman it should not cost much more than $100
the problem may be due to dry soldering in the power supply stage if it was with the lamp there would be red or green light showing the presence of the power to the tv after making it own some of the components get hot and it will make the the soldering point conectionless and after some time the heat sink get cooled and the soldering point gets connected and u will see the picture again it is a simple problem if u have a soldering iron u make it hot and re solder all the components in the first part of the circuit board and the problem if rectified
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