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You have 3 CRTs inside of your TV that create image. Blue, Green and Red. Looks like one of them need adjustment due aging. Remove front grille. Than remove center "shielding" piece held by 4-5 screws. Behind this cover you will find little black plastic box that have 6 rotating buttons on it. Take you time to study them. There is three columns and two rows. Columns represent color, rows - "Focus" or "Screen". You need to locate "Screen" row of three rotating buttons. They will be marked "B', "G", and "R" for colors accordingly. Turn on TV let it warm up and try to figure out witch color is dominating others on your screen. Then carefully turn rotating adjuster counterclockwise using Philips screwdriver. Try to muscle-remember original position of screwdriver so you can turn it back to it. Eventually you will find the right one, you will see lines dissapear when you reduce voltage and reappear when you turn rotating shaft back. Sometimes more than one have to be adjusted. Try to have all three color to be present and visible but with no over saturating and no horizontal lines. Put cover and grill back - and that's should do it! Regards. Russ.
I must say this is a wierd problem here.
First of all, make sure that the T.V. has enough space, and the cables arent layed on each other, give each cable its space.
Now, try to check the main T.V. cable, is it strongly plugged in? because it should be, might be that your cable is weak and gets loose sometimes, so try to plug it in in a strong way.
Keep me informed.
could be a couple of things first i would guess to be convergance ic then IC831S (STR-X6456).and could be loose connection. you could try this to narrow it down, purchase a can of freeze at radio shock and spray it on these ic one at a time see if it stays on longer or just replace them
HLP, HCN HL-S The Start-up Problem or/and 3 LEDs in the front blinking. Unplug the set, pull out the lamp module (not all the way - leave it on the track) and push it back in. Power issues (Tv not turning on) were typically due to faulty ballast. While the TV reports a bad lamp it is the ballast itself causing the issue. Samsung is well aware and will replace both the ballast and the lamp (since the lamp can be prematurely aged but the bad ballast). After replacment most people stop having issues.