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Re: sony projection blue double vision KP-61XBR48 mod #
Joe, did you have a tech confirm it`s the yoke? Not a common problem to have a yoke failure, maybe yoke return resistor(s) or possibly bad convergence IC`s, poor signal from DCU (digital convergence unit).
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Possible there is shift in alignment which can be corrected only with a proper test pattern and resetting procedure. I would recommend that you must take opinion from Sony for estimation before any work is done.
Convergence IC failure is very common. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless
Symptom: Unit appears to have poor convergence due to: 1. cross hatch appears tilted 2. one color (or more) being larger than the others.
Cause: The yoke or yokes may have: (1) rotated slightly or (2) slipped down during transport.
Resolution: Loosen a yoke and lower to inspect the tape. If black tape is present remove it from under all yokes (white tape or no tape is OK). Slide yoke or yokes up tight against the CRT and tighten to prevent slipping or rotation. Precede with alignments and or convergence as necessary.
Sounds like a bad solder joint in the power supply or if your audio stays when you lose the video its probably in the deflection circuit either vertical or horizontal. Check the yoke connections.pins for cracked solder as well as the vertical and horizontal outputs also around the flyback.