Question about Samsung HCL4715W 47" Rear Projection Television

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HCL4715W Rear projection CRT problem

My Red CRT is dim, and the dials directly on the CRT boards for all three CRTs (red, green, and blue) have no response. Just changed SUB PCB because of convergence problem. Convergence fixed, but now color is bad due to red being dim.

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  • Anonymous Sep 04, 2007

    Focus controls are on the focus block, screen controls are located directly on each CRT.

  • Anonymous Sep 06, 2007

    Repeat....

    I have opened the TV up. The focus controls are on the focus block (3xwires), the the screen controls are on each individual CRT.

    All three controls do not respond, and Red is dim. Red is the first in the series for screen controls

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Your screen and focus controls need adjustment to acheive a good grey scale picture the adjustment are not on the crt neck boards.(focus block)

Posted on Sep 04, 2007

  • Anonymous Sep 05, 2007

    remove front cover panel you'll see a black control box about 3"x3" has wires going to it they should be marked screen and focus,green is in the center,also clean your lenses for each crt.

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