My broken but loved big screen zenith projection television r56w36
Hi, i have a convergence problem,i replaced both ic stacks stk392-570.now when i push auto convergence it goes all the way through,but whole screen is out of alignment. the screen is bent at the top and bottom.
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It will be good to check once again on the work that was done as there is a possibility that the pins are bridged with solder when the rework was done. So if you are able to use a magnification glass to inspecct it will be good and if so there is also a possibility that the IC was damaged. Finally int he first place the identification of the fault of the convergence IC must be established with your test other wise a board replacement might confirm.
You need to Change out the Convergence ICs they are Big Black ICs and will have the part number on them STK392-570s I think is what they use in this model.
Mats Electronics has ICs 1-800-628-1118
You can ship the Convergence board to PTS and let them rebuilt the board 1-800-844-7871
Zenith Exchange Moduels 1-800-632-6637
If you plan on Fixing this ,then you also need to check the Low ohm resisotrs 1ohm and Capaciotrs 1000uf 35v near the STK ICs
Bad convergence causes this replace STKs or whole convergence Board STK ICs are big black ICs will have part # on them STK392-110s call Mats for STKs 1-800-628-1118 or to replace whole board call Zenith exchange 1-800-632-6637 they even have power supply boards when in stock or they can rebuilt your board.
This needs a special remote to get to the factory alignment screen.This is the part # for the remote ---#105-201m .
You really should call a good TV Tech on this one. They are a convergence nightmare for even a good Tech.
If you replaced the convergence ICs did you check the convergence resistors as well, as often the old ICs will take out a few resistors in the Convergence feed circuits or at least increase their values and that can give those symptoms youre describing after new ICs are instaleed.
replace the convergence amps and any blown resistors or pico fuse on the board. this is a common problem of rear projection sets this repair is not for the amateur have it done by a pro. the cost of the repair may be around $ 350.00. if you so choose to do the repair yourself, look for the two large ICs on a large heat sink (stk392-xxx).repalce them use heat sink compound on the new ICs and check the resistors around the ICs with a DVOM and check any pico fuses for open.
Unless you can do TV repair your out of luck on this one! Replace your convergence board or ship it for repair cheapest way.You must remeber to connect board exactly the way it hooks up , convergence board has 2 ics on it STK392-120 these ics go bad all the time and when you press auto they quit working.If you need any more help let me know. ThankYou for using FixYa. Have a Nice Day.