Yesterday my 3 year old tv out of the blue just started throwing red squiggly lines mostly around the border of the screen, but also now the entire picture is seemingly saturated in red... I have cleaned the lenses, carefully, but this didn't seem to help. when I hit the auto focus, there are two plus signs, one red and the other white... are these supposed to be one plus sign? if not is there a way to manually focus it back? or is one of my tubes going down hill fast?
Thanks for any help
Patrick
Much to my suprise these tubes need to be
re-juvenated with a crt shooter.
this does not bode well with the so called king o the hill (sony).
although after re-juvenating the tubes seem to hold up rather well.
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Sounds like you may have just left one of the wires loose from the red tube. Not likely an issue from the gren tube but you can always cover the top of the lens and let just green shine up. That may help narrow it down also.
Here is more detailed info for you also.....
Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.
What you will need to do is replace the coolant and clean the crt. You can get a repair kit from TvRepairKits.com . It includes replacement coolant,step by step instructions, support, etc.
the 43h71 has a pair of convergence ics that commonly go bad and cause this problem. replace original stk392-110 with stk392-120. the upgrades have a collector rated at 4 amps vs the 110's 3 amps and should be more reliable.
also know that they hyperboard in this set can cause squiggly lines throughout but will not affect the convergence.
These are retrace lines. The screen on the red tube is turned up too high. Inside the set there are 6 knobs. 3 for focus & 3 for screen. Turn down the red screen until lines are gone. These knobs are usually found by pulling of the front panel.
The Blue SCREEN setting is too high. These adjustments are located inside the TV behind the front panel. There are two screws behind covers and then a wooden panel to remove to access the adjustments. The leftmost set are for BLUE, the middle are GREEN, and the right are RED. The top row are FOCUS and the bottom are SCREEN. Focus will focus/unfocus the tube and Screen will adjust the power of that tube (there are 3 tubes, one for each color). If Screen is adjusted too high, horizontal lines will appear (my TV had red lines, but I played around with the knobs and saw that it could happen on any of the colors). Additionally, if SCREEN is set even higher than that, the tube could go so high that it turns the whole screen that color (in your case, blue). If this happens the TV will shut down, probably due to either overheating or overvolting. To fix this issue, turn the appropriate SCREEN dial down until the lines go away. In your case, you want to turn the lower left dial down. Don't turn it too far down, if you turn it more than necessary the TV can give you an AKB error (noted by the STANDBY light flashing a sequence of 5 blinks).
Focus and screen control box / remove front bottom panel there you will find it / it has 3 controls on top 3 on bottom top are focus for RGB tubes bottom controls adjust screen drives for RGB.
we have repaired 100s of these tv..most have a flicker issuse and it is getting hard to find replacement tubes. the cost sounds right...I suggest to invest in a new tv.
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