Question about Hitachi 57GWX20B 57" Rear Projection Television
Did this happen suddenly, or has the picture been dimming gradually?
If it was a sudden onset, I would first suspect the high voltage terminal/focus divider block. The focus divider in many sets also produces the "screen" voltage, which has an effect on the brightness of the picture. Often focus dividers will crack when they fail, so you may be able to spot a problem with this part by visual inspection. Other possibilities include an incorrect (failing) supply voltage to the picture tube boards (G1, G2, or driver transistor power).
Gradual dimming (other than problems with degrading components in the power supply):
Do you have a smoker in the house? The tar in tobacco smoke is attracted to the high voltage on picture tubes. You may need to clean off all of the optical components. I have found that window cleaner sprayed on a soft paper towel works for this. Do not spray the cleaner inside the set, and don't make the towel dripping wet with the cleaner! You risk serious damage to the electronics if you do. Avoid scrubbing - you don't want to scratch anything or push it out of alignment. Just keep wiping gently and let the window cleaner do its work. If tar buildup is the problem and it is as far gone as you describe, you will probably use up quite a few towels and a sizable fraction of the window cleaner bottle before all three picture tubes are clean. Don't do more than dust off the sides of the tubes - it's the face that needs cleaning, and window cleaner is bad news
Another possibility is broken-down CRT cooling fluid. (This is low probability - you would probably have noticed the colors going to an ugly yellowish brown long before it went dim.) When you look at the top of the three picture tubes, you should be able to see that they are red, green or blue. If the colors are quite dark, dull or muddy-looking, the CRT coolant has gone bad. It is possible to change it, but be warned that you must not let any drip into the electronics. Broken-down coolant can conduct high-voltage electricity, and the results are disastrous - I've seen a power supply board ruined by the stuff.
Posted on Oct 23, 2010
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Posted on Jan 02, 2017
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