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Check the resistors near the ic, and the fuses to the ic's, i bet you will find an open fuse. the fuse will look similar to a resistor without color bands. use a dvm and set it on ohms, with the tv turned off.
I just replaced the 2 convergance chips, but it did not seem to fix the problem. I then tested all the resistors that feed the convergence chips anf there was a 2.2 ohm fusable blown. IT was R7050 on mine. That seemed to fix it so that I could adjust all the colors through the convergence 2 screen. There seems to be a slight bow near the bottom when you look at the c2 screen, but not noticable when you are watching a picture. Since I got this broken, I am not sure how perfect it should be.
If anyone can send me the service manual, I would appretiate it. Thanks.
You need to re-solder the circuit board that contains the STK
convergence modules. They're on the center circuit board attached to an
aluminum heat sink that's about 8" long and 6" tall, about dead center
in the circuit board. You may be able to recreate the problem (hour
glass effect) by gently moving the heat sink (which the modules are
connected to). This gives the hour glass effect on the picture and the
advanced convergence screen. This is an indication that the modules
pins aren't solidly connected (meaning soldered) properly. Remove the
circuit board and clean the old solder off & resolder the modules
pins to the circuit board reconnected the board and then retest by
again pushing on the heat sink. This is a caused by a minimum
effort (a.k.a. minimum cost) solder job, probably done in some 3rd
world sweat shop. The "factory" job was good enough for 3-4 years but
the heat (and these modules do create a lot of heat) and stress created
from repeated use eventually takes it's toll, weakens the pin
connections and our problem occurs. take the appropriate cautions
working around the high voltage of the set & use a non-conduting
piece of wood to push the heat sink when doing tests. Best of
luck, hope ya fix it.
The convergence Ics need replaced. In Hitachi, resistors and sometimes a coil needs replaced as well. The convergence/deflection PCB is available, but, the cost of that board is higher than having a servicer come to your home and repair the unit to component level.
If you are not familar with this circuit, then call a servicer. Have them replace both ICs not just one. Make sure they are repairing to component level and not replacing the board.
Hope this helps.
you have a convergence problem.. If you understand how this works then you can go into the set find the convergence ic's and replace them and sometimes you need to do some alighnment as well. Its always best though to let a service tech do a job like this as he will have all the proper equipment to adjust and troubleshoot the set Good luck