I have had this set for quite a few years without incident. Recently, with no discernable periodicity; a white horizontal line with no picture pops up(black screen above and below the horizontal line in the middel of screen) in the middle of the screen and after a second or so tv shuts down. If we unplug the set and let it sit for a couple of minutes and then plug it back in--it will sense input from satellite receiver and turn back on. Sometimes it shuts off 3 or more times in a 30 minute period and sometimes it will go all day with no problems/
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Sounds more like a electrical issue, perhaps a bad computer. I had one case where the oil sending unit had a broken wire inside the insulation. When the car was cold it ran fine, once it heated up it would spit, sputter and quit. The problem was intermittent and totally unpredictable as to when it would do it next. I finally tracked down the problem, and subsequently learned (even though the service manual made no mention of this) that the computer will shut down the engine if it detects a low/no oil pressure reading from the sensor, which is what was happening, since the computer would get a zero reading when the wire separated. It may be wroth looking into, you may have a similar issue. Rare, but did happen!
If the wires got crossed and/or touched each other at all - that could certainly damage the amp(s).
Also - if the system is not made for extra speaker - that would change the ohmage - and that could aslo damage the amp(s)..
Or maybe the system designed to protect the amp(s) was damaged..
To save you all the hassle check your spark plugs & distributor first if you are getting a spark. To do that first take out the number one spark plug wire it will be the one closest to the distributor. Second take out the spark plug, then put the spark plug in the spark plug wire. Turn on the engine u should see a spark at the spark plug if your distributor is ok and spark plug. If not replace your distributor.
It's quite possible you may need to check out your ABS system. Certain GM light trucks of that year, and a few in subsequent years had issues with the EBCM (electronic brake control module) These units are mounted on top of the ABS valve body, under the vehicle, on the left frame rail (all the brake tubing is attached). Sometimes the faulty unit would cause the electric ABS motor to continue running even after ignition shut down. Sometimes they would cause erratic ABS actuation.The other thing may be a faulty vacuum check valve at the brake booster. If that valve goes bad, your brake pedal will be really high and hard to depress. On some 1/2 ton GM trucks with vacuum assist power brakes, there is an electronic sensor that measure vacuum to the booster. In those instances typically a warning message will come across the drivers info center on the instrument panel. I hope this info can help.
Might be worth flicking through all the settings menus for a few minutes - look in particular to see if you've got it out of Auto into Manual Exposure, or if somebody has accidentally selected a "brighten everything up by a couple of stops" mode.