Question about RCA F27440 27" TV
I have a 26" RCA Colortrack TV model # G26231TN manufactured in July 1989 that is slightly out of focus on the left and right edges but appears to be in focus in the centre area of the screen. I have electrical training and am hoping to be able to replace the part if you are able to identify it to me. Can you help me with this?
I've seen this on many computer CRTs as they age past 6 years. I would imagine that the gun alignment is out. Are all the colors (RGB) fuzzy, or is it hard to tell?
1. Sometimes, extreme settings of contrast or color (usually to offset low output from aging CRT) can appear to unfocus your screen. Adjust color/contrast down if they are maxed out or close to highest setting/pot level.
2. A very likely culprit is unshielded speakers are too close to the screen. If this is the cause, the speakers' magnets distort the part of the screen closest to them (sides), and it will get better/worse as you move the speakers away/closer to the TV. If there are not magnets near the TV, and degauss function does not fix problem ('89 TVs have degauss?), see #3.
3. The focus can be set by adjusting the flyback transformer. As an experienced electrician, you should know about the dangers of messing with the insides of the unit.
If this fails, you might have other bigger issues. I'd suggest a nice trip to lead reclaimer if so. I'd say 19 years is quite a life for a CRT.
Posted on Jan 18, 2009
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