The other night, the picture finally quit. There is sound but no picture. Replaced fuse F301. Still no picture. When the TV is tapped...either by the FBT or on a heat sink, get an intermittent white line across the screen for a fraction of a second. Resoldered FBT. Any ideas?
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Re: Sound but no picture
A white like across the screen means that the vertical circuit has stopped working. Look for a small fuse that looks like a resistor near the vertical output IC, replace that fuse if open and resolder the pins on the vertical output IC.
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Same problem with mine. Relays click, sound, no picture and a flashing power LED. I finally found a schematic online. I went through the high voltage circuits and found the power transistor 2SC5570 was shorted out. There is also a pico fuse in that area but my was not open. I replaced the transistor and prayed the flyback transformer was not shorted. It wasn't, I'm watching my old 36" right now. Not a bad fix (17.00) bucks. Wonder what a service tech would have charged ;)
I think you have a vertical problem. Turn up screen voltage to see if there is a tin horizontal line across screen. If so replace vertical output IC and the 100uf/35v capacitor in the vertical circuit.
This has happened to me quite frequently. I have replaced the fuse at least 8 times. You just take off the back of the t.v. and on the bottom you will see a small glass fuse. just pop it out and go to radio shack and get a pack of replacements. about 4 for 3 dollars.
You have a shorted power component. Probably either the voltage regulator or the Horiz. output transistor. Both will be mounted to a heat siink of some type. The Horiz. power circuits along with the flyback transformer power up 90% of most TV sets.
Last night i set childlock in my nikai ( NTV34010) tv set and tuned off by remote control.Then after some time later i tried to turn on tv but there is no sound and no picture.
will u please help me to solve it out.
When you see white lines at the top of the screen, it means that the pump-up capacitor next to the vertical output IC is bad and the IC is about to quit. When the output finally quits, you get a black screen with possible dim spots. The vertical output IC and its pump-up cap will have to be replaced, and the little fuse resistors next to the flyback in the + and - supplies to the vertical output IC must be checked too. If you have experience working on TV's then you can do it yourself, but if not then have the set serviced by a tech experienced in Sony sets.