Question about Sony KP-46WT510 46" Rear Projection HDTV

2 Answers

Convergence or gremlins?

Greetings all...
I have a Sony 52inch television model #KP-53V25. Yes it is old but very good to me. This was my first "widescreen" so I guess I am having seperation anxiety... ~the first love is the deepest.

It recently started to display a slight double image of color ( mostly blue ) on the left side only (1/4 of the screen). The picture otherwise is flawless. Normally, I would buy a new one but this TV has been an incredible workhorse with just simple cleaning & maintenance.

* I am able to adjust the convergence in all 4 directions for both red and blue but somehow this "ghost" will not sync up with convergence.

I have hit a wall in terms of reading reference so I am reaching out to anyone's thoughts or experience.

Any info would be GREATLY appreciated.

Thanks in advance.
Dan

Posted by on

  • dantyka Jul 09, 2009

    I will check schemastic and see if "pot" adjustments will clear the problem; if not, I will venture into replacing failing resistors but I may be wandering in the deep end of the pool if schematics are not too clear. It's been a while for component level for me.

    I will post results later this week.
    Thank you for your time in tryig to assist me.

    All the best!
    Dan

  • dantyka Jul 11, 2009

    I thought I would give an update and search for a little more help.
    I cannot seem to find the correct adjustable resistor that controls the voltage for color intensity. I can manually move the blue gun and alighn it with shims but I know the must be something I am not seeing. If someone is familiar with the actual inside of this model and can guide me to locating the "pots" that control this issue, it would be greatly appreciated.
    I see the schematic and tried to follow the components to the issue but was unable to get an exact location. I believe we are on to the correct problem, however, I am not sure of the phisical location for the adjustment.

    Thanks in advance again.
    Dan

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Something is wrong with the blue convergence. it might be a failed resistor or the amp itself. i have had the same problem with a jvc several times. last time i added a couple of small 12v fanson the heatsink and run them with a small 12vdc wall wart. so far this has lasted 2 years(longest ever). the green is a fixed color it is not set by the user. the blue and red however, are movable to adjust the color and somewhere you have lost this. by it being only 1/4 of the screen it probally is a resistor on the convergence board( they act as fuses,usually very low ohms and 1 to 3 watts). some tv's have bad solder joints on the board thru holes. be carefull cause some tv's have a safety interlock, if you remove the back the interlock will wipe the digital boards memory and you will have to replace a very expensive part.

Posted on Jul 09, 2009

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By design the blue gun is out of focus. It sounds like you are needing to tweak the focus or up the focus voltage. but remember the blue will never be a crisp focus compared to the green and red. good luck

Posted on Jul 09, 2009

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