I have a problem with a Sony KV-36XBR250 TV. I recently moved it and afterward, I found that I had sound but no picture. I can also change the channels. When I turn it on I get no static on the screen. The light on the bottom blinks continually. I have read that the blinking means. No reply from the jungle IC301 (data bus is busy, shorted to ground or held high), IK video path is defective. Does this mean that I should find IC301 and replace it. I think that it is on the ?B board?. (I have a service manual and schematics for the KV-36XBR 400). I left it unplugged for several hours and retried it with no luck. I have taken the back cover off and pressed down on some of the connectors hoping that something may have come loose while moving it. I had no luck with that either. The back of the tube does not turn orange when on. I really want to fix it myself. I don?t think that it is worth a large repair bill. What else can I try or replace? Which board should I look at first. I do have some electrical repair skills, a meter and a lot of patience. Help please.
Thanks, I had someone here fix the big board. It seems that when we lifted it with the hand truck we broke the board. The unit is so heavy it is hard to hand carry upstairs. The repair was just under $200.
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Check whether the filament of CRT glow or not. If not, check all the solder terminals at the CRT base card. If it glows, check all the voltages at the video output card, said above. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts.
Did you get your set fixed or did you replace it? My same set did the same thing. Turned it off for 2-3hrs after watching it and when I tried to power it up- nothing but the sound it would normally make just before the major power up, sort of a relay click sound. No picture or sound but the red light blinks non-stop.
I have seen this flashing before, this could be an indication that the picture tube is weak, what happens is that if the white balance is off there is a circuit called akb it monitors the kathode of each gun and if they are not in balance it will attempt to balance it out. if it can't the picture will begin to flash, sometimes in some models the power light will blink 5 times. On some models the power light will only flash if the tv gives up trying to compinsate for white balance and shuts off compeletely. If you see the tv shutting off with 5 blinks then you know for sure it is time for a new set.
TV Repairman came out today to look at my Sony KV-36XBR250 today with the exact same problem - he was able to adjust the settings through the service menu, but said it was a temporary fix only.
The picture tube is going and the Sony circuitry has a "video mute" that it uses when it senses the tube is not warmed up enough. The degraded state of the tube causes the blinking on and off as the signal from the tube wavers.
He ballpark estimated the tube replacement cost well above the price for replacing the set with a 37" LCD, so it's going to the dump...
Ibonne- firstly what is the reasoning for wanting a pix tube" do you have dark picture or poor color. generally when the tube is gone the screen changes to one color.the price of any pix tube is more than the set is worth generally.Please explain problem and maybe I can help you. cooltek Feb.15/08
shannonlamb- check the back of your set where the cable ect. hook up, there may be a button on the back for speaker on/off.If not then check the menu to see if there is speaker on/off in menu make sure it is on.The last is the old tap test, just tap the back and sides,if you get sound at all it is internal cold solder joints.Let me know ----- cooltek Feb.15/08
This is a common failure mode (which I now share), and has nothing to do with the picture tube or surge protection. From the forums I have searched to-date, it appears to be a failed component in the flyback circuitry, but Sony will not admit to an inherent defect.
If anyone has ACTUALLY FIXED this problem, please post a reply. Guessing won't help anyone.