What you need to do to test the chips is check the fuse for each of them. Fa 4 and fa5 I believe. If the fuses are open the chips are shorted or drawing excessive current.
If you had been viewing lines on your screen for awhile this is the next level of that problem.
If the fuses are open ,your getting a code flashing on your TV and it's not turning on.
Those chips have to both be replaced even if your just at the lines through the picture stage of the problem.
High skill level required or lots of guts and even more patience.
SOURCE: Update and a few questions (Convergence Problems - VS-55601 55 in Projection)
yes, they go bad interment because they have a large current go thru them and they generate heat, they are mounted on a heat sink with white silicone to help disapate heat. replace both not just one, try MCM Electronics get heat sink compound also
SOURCE: on a mitsubihi wt42311 tv where are the STK-392-110 convergence chips located?
Pretty easy to see them as they are marked with that number right on them.
They will be side by side and on a metal heat sink to keep them cool.
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