Question about Toshiba 40H80 40" Rear Projection Television

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Initially No Picture when Turned on but sound normal and 5 minutes later Picture is all RED and then Picture becomes NORMAL (all normal colors)

I have a 5 year old Toshiba 40H80 HDTV that just was serviced and all three CRT Tubes (RED,GREEN and BLUE) were replaced and anode cables. The TV played perfect for the 5 years except for some faint "burn in" that the replacement CRT Tubes fixed. TV operated normal for two months and then there was a "POP Sound"....no picture or sound but after 10-15 minutes the Picture and Sound returned to normal. Now every time I turn the set on, I get sound as normal but no picture but if I wait 3 to 5 minutes I get a picture to show up on the screen (always RED at first) and then the picture becomes normal with all colors corrected. The TV then operates normally until I turn the TV off. I believe the problem has something to do with something thermally heating up and then coming on (picture wise) normally or a Time Constant for the High Voltage has been affected. The problem is with the TV and not my Cable Provider as I have disconnected the Cable source and the problem on the TV is still there. I cannot believe that it is a problem with the CRT Tubes because I cannot understand how a CRT tube could be bad at first and then become "normal" after 3-5 minutes of warm up time. Hoping that you have some suggestions for the problem and that it is fixable. My service contract has expired. Thanks.

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  • Jay Fehring May 17, 2006

    Thanks a lot for your insights....the repair company that replaced the CRT tubes and anode cables have not been paid the $940 from the GE Service Contract I had the work done under. Since I have no Service Contract any more just to them check out my TV will cost me $500 to get it to their shop and if it is another part I will have to pay for it. I am hoping that the problem will not get to much worst and the set keeps operating normal after the warm up.

  • jkoshi Nov 14, 2007

    I have the exact same problem as the one above. One day, there was a small pop sound, and the picture went blank. After I turned it off, and later turned it back on again, I could hear the audio but no picture until about 3 or 4 minutes. Then it would start up with a wavy pattern at first, and then become normal. After a few weeks, now th epicture doesn't come on at all.This TV is also about 6 years old.

    I took the back cover off, and dusted off the components inside, and did a visual inspection. Nothing seemed amiss, externally. I'll take a lok at the "high voltage block next time. Any tips on where it is located would be a big help.

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Theres a high voltage block that all three of the anode leads attach to and sometimes a small crack happens across this block and will not let some or all of the crt's get the high voltage all at once untill it heats up a bit. now if this is not your problem i would make sure that all three crt sockets are attached to there tubes all the way as maybe justy maybe there loose and will only work after ther expand a bit. Now another problem that could cause this problem to occor origially would be that someone left off a crt ground strap and the crt arched and popped and caused the problem with the High voltage block. And no I cant see a tube being bad then comming on at first UNLESS when you say the red comes on is the picture all red with small retrace lines(small white lines)in the screen with no picture except for red???? No video only a red blank screen is what i mean. If thats what its doing then yes Ive seen heater to cathode shorts on a picture tube that would cause this problem but to be sure your really gonna need to have the set looked at.. Good Luck

Posted on May 17, 2006

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