OK, turning the manual focus on the tubes will not solve this--I am the right one to help you.
3 d means convergence problem (see typical photos)
Your set should use two of the stk-392-110 chips.
Three things to do here:
1) chips are side by side on metal heat sinks with fins--confirm number printed on the front of them.
2) examine all the light blue resistors in front of them--most will be marked 2.2 and it means they are 2.2 ohm.
3) Light box needs to be removed to safely replace them.
Good news:
Parts on EBAY WILL COST YOU LESS THAN 20 DOLLARS.
I can tell you how to get the light box out for this repair.
I have start to finish, step by step instructions for this repair in this set. They tell everything you will need and how to do the repair.
I will assist you from start to finish with the repair.
I can post instructions here or if I had a email address I can email them to you.
check my stats here, I am expert on this set and will help you save the set and money.
If this information helped you, rate this solution as very helpful as I do this here for free.
Let me know if you want the instructions, they are based on me fixing hundreds of these sets with this problem.
SD TECH