Question about Televison & Video
Posted by Anonymous on
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Posted on Jan 02, 2017
Does it shut off shut off, or is there audio present after the lamps shut off? When you shine a light to the screen do you still see picture kind of?
If still see picture, it's inverter/power supply or CCFL bulbs itself. If no picture, completely off, it's DEFINITELY the inverter/power supply.
Posted on Dec 08, 2009
SOURCE: Sylvania Model 6632LG shuts down
Check power supply board and inverter board for faulty solder connections and visually inspect electrolytic capacitors for signs of stress or failure. Bulging tops, black or brown crusty material oozing out of them, are the most common. Replace those that are visibly faulty with high ripple current types.
If that does not resolve it, the next step is to test the transistors in the 24 volt section and inverter section primarily. Recapping the power supply 24 volt section is prudent regardless of physical appearance of the electrolytic capacitors.
Posted on Feb 07, 2012
Olivia tv. 237-T12
I had the exact same problem. I can tell you how I successfully fixed mine.
I replaced the capacitors on the power supply board that looked even slightly overheated.
The plastic appear slightly shrunken.
None of these capacitors read bad after I removed and measured their capacitance.
So I cannot nail down a specific cap, but the tv is fixed, no more shutdowns.
These circuits are designed to over heat the caps, they are placed too close to the heat sinks.
These tv are so big that (so much real estate) they could have easily made the board a little bigger,
so the caps are not so close to the heat sinks,
but then they would not sell as many tv, the tv would last too long.
1) Make sure that new caps are high temperature, at least 105 degrees Celsius caps.
I used caps of a little higher voltage rating than the originals.
2) Do not cut the leads, use the full length, so the caps will stick up about an inch out of the board.
position the caps as far away from the heat sinks as possible when soldering them.
This will look ugly but who will see them after you put the cover back on the tv??
c86, & c20 470u 35v
c39 10u 50v
c79 47u 50v
c69 4.7u 50v
c81 2200u 10v
c79 47u 50v
c74 10u 50v
This solved the problem.
Posted on Aug 05, 2012
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