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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The board that might need replacing is the T-con board but before replacing it, I would suggest to measure the voltage at F301 on the T-con board.
Replacement parts can be found by checking the link provided below:
Check the lamp.
Pull it out and look at it.
More than likely the lamp has shattered inside the set and needs replaced.
Bulb replacement is made for consumers and can easily be replaced.
Need any more information, respond to this post and I will reply.
I would Google the model number carefully for "problems" "no sound" and usually this set will display some kind of error code===it may even have a hard reset to try===service manuals are available on the net/web to allow you to see how the sound circuit is set up etc.
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.
Does anyone know where can I buy a screen for a 27" LCD Insignia TV. Model is NS-27LCD? My screen creaked. I checked out e-bay and have not found a broken TV with a good screen. Does anyone know where I can buy a screen at. Thank you all for you time. JC
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.
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.