Quote:
Originally Posted by CRTguy
How many hours would you consider high hours? Chances are that my Panasonic set is a higher hour set. There was some soot on the tube and on the flyback but not a huge amount. I will say that the picture still looks very good. I always thought it was a low hour set until I took the back up. One other thing is that this TV has 1 composite input on the front and on the top of the PCB where this composite input is, the PCB is black around some of the components. It's not charred by there is a black color. The bottom of the board is not black at all. I'm wondering if the set is still safe to operate if there is a little bit of black on the PCB?
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I never really though about it tbh, but if you consider that a high hour set could have been used for 10 years, for 3 hours a day, maybe 5 days a week or more, that's 7000-10,000 hours.
One of the older members here that did professional repair work would have a better answer.
Yes, it can be bad or dangerous in some cases to run a TV that has obvious black charring on the PCB. The black stuff is carbon, and carbon is conductive. If there's enough electrical potential on the carbon burn mark, it can cause arcing. I've never had it happen to me, but I've seen videos on YT that showed it happening.
Generally though, mild darkening or discoloration isn't a problem, just actual carbon burn marks or charring. There's stuff you can do to cover it up. When I find areas like that, I typically replace the resistors with something beefier with longer legs and solder them off the PCB a good ways to allow the heat to dissipate better. Not sure if that's the best thing to do, but it makes me feel better.