Question about Apex Digital GB55HD09W 55" Rear Projection Television
On start picture is fine after a time it becomes the green color goes out of convergence, at the top and bottom near the middle of the screen. Do I need to replace the convergence unit? If you have any other possible solution please inform me.
Your symptoms sound like an intermittent connection on the convergence IC’s.
There are two and sometimes three very large IC’s that control the convergence in a big screen set. They are secured to a very large aluminum heat sink.
There are two ways to repair intermittent connections on the convergence IC’s. I usually remove the board with the convergence IC’s on them and then and solder the connections. The other method is to tilt the circuit board and solder them while still installed in the chassis.
If you remove the board and repair the connections, be careful to remember which connections need to be made when you replace the board. Mitsubishi uses a lettering system, so it should be easy.
If the problem remains after you have made the repair, it is possible that the pins on the IC’s have become loose. In this case the IC’s need to be replaced. I have seen this on several occasions.
If you choose to repair the set yourself, be very careful of the high voltage that can be stored in the capacitors, and CRT’s. This voltage can be as high as 30,000 volts.
I hope this information allows you to resolve this issue.
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Posted on Jun 21, 2009
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Posted on Jan 02, 2017
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