Question about Sony KP-51HW40 51" Rear Projection Television

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Red flash, then tv turns off

We are having this red flash problem as described, then the tv shuts off.

Posted by dothompson on

  • 3 more comments 
  • dothompson Dec 17, 2007

    We think it was just an adjustment issue. We removed the front of the tv and adjusted the red gun and now it seems to be okay, at least for now. We think the problem arose when we moved the tv, throwing off the adjustment.

  • Anonymous Dec 17, 2007

    happens @ once a week, sometimes while changing station, see bright red lines, then entire screen goes bright red and tv goes off. tried turning the pot on front for red to the left (1/16 - 1/8), but problem still persists. picture can look great at times, then appears to be losing "red", showing more green, as if hue setting is going off.

  • stressedmom Dec 18, 2007


    Have the same problem. Happened just days after my warranty expired. Call the repair man - told me it will cost $500 to repair. What is a red CRT? Should it cost this much to repair?


  • roger d Dec 22, 2007

    had same problem except tv flashes green them shuts off,had green crt removed and repaired at a cost of $ 500 and fix lasted for about 4 months and now it is doing it too good to throw away but can't put $500 into it every 4 mo.anyone know where i can find a new green crt for a sony kp-57hw40 57 inch tv approx 4 yrs old. roger .

  • mike_dixon Aug 28, 2008

    I've got the same issue with green. Been fighting it for about a year, but I can't seem to adjust my way out of it anymore. Tempted to fix it, but $500 seems a bit steep to be unsure of its future service when the new tvs are only another $1000-$1500 more...



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Eduard P

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Red CRT defective. I have one brand new if you want to fix it.

Posted on Dec 06, 2007


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According to the manual (you can see it here) page 122 that describes 3 red flashing lights:

"The lamp cover is not attached securely. When you secure the lamp cover, the POWER / STANDBY light flashes in red and the LCD projection TV enters the standby mode (see page22)"

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I hope this was at least a good starting point for you & good luck. Please rate my reply. Thank you.

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It wont stop shutting off!

You can try the suggestion on the site I posted below. This site addresses a specific problem that tends to be fairly common in some Sony sets. Only try this if your sure that the problem your having is the same problem described in the site. Look at the picture of the screen on the site and see if that looks like your screen. The set on the site is red but it could be Green or Blue also. If you set won't stay on, you may have to turn the appropriate knob down slightly in order to get the set to stay on. Although he mentions this will fix a convergence problem, the fix described has nothing to do with convergence. The symptoms you are describing do not sound like a convergence issue. I am however a little concerned about the smell. Another thing is, after the set shuts off the Led will blink a code. For example it may flash 8 times then pause and repeat. You can Google this to find out more info on the problem. Many things can go wrong with TV's, I recommend you do as much research as you can to narrow it down. Good luck, here is the site.

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Red Flash -- TV Shuts Off

Unfortunately, you are describing the classic symptom of a bad picture tube. When the tube warms up a short developes in the neck of the tube, usually between the heater and cathode and this forces the tube to go full on, giving a bright flash of the color of the defective tube. The computer senses the extra current flowing through the flyback (high voltage) transformer when the tube is shorted and shuts the set down. The only solution is to replace the picture tube, but the Sony tubes are relatively inexpensive (about $175 for the entire tube assembly including sealed coolant) and they are very easy to replace and realign, but of course this must be handled by someone with experience.

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