Dlp light doesn't lite up

change the picture board

Have you checked DLP termistor?

After you replaced 2 bad leds the back lights stopped working?Possible that when you did the soldering you may have inadvertently shorted something out? Was working before you touched it so ...............Th is a puzzlement.
Meanwhile is set connected to signal source? If so you should at least have audio. If not that alone is a main board issue. You might want to check this site for further info and parts
. TV Parts Universal TV Stands DLP Chips ShopJimmy

Check the fittings of the color wheel. Refer this site for more details.
http://electronicshelponline.blogspot.com/

Hi there.
Check for wiring errors, fix and tighten all wiring connections. Make sure that the gas pressure is correct.
Check the hi limit and gas valve, one of those component may be bad.
Regards.

which of the three lights is flashing red?Let me know and I will assist you with the issue.

How big is the spot? is it always in the same spot? it seems that you have dust in front of the LCD.

Tony

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/tony_a41fa0b801734e2f

open capacitor chck it out

If this is a Sony dlp then check the lamp door for warp, if this is not a Sony need model and brand. Or if it is a Sony but not a DLP then still need model.