Whenever I turn on my TV, sounding icon stay on left of sounding bar and the bar sticks on top of screen. No matter I used remoter or TV control, The icon can not be move to right, which means there is no any sounding. I went to TV repair store, They checked and said it is a problem of Memory IC to be needed replaced. Is it right?
Yes it is called an EEPROM IC chip that needs to be replaced. Very comon to fail on these types of sets. GE owned RCA back the 1990's now funai owns both along with magnavox and parts may be hard to get.
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sounds like a vertical problem, usually you'll see one white line across the screen, but one I worked on would come on and the bottom half of the picture was gone and there were lines across the top of the screen.
If you know how to solder & can find the vertical output chip then you could try resoldering the pins. If this doesn't fix it then it needs new parts.
if yo know how to solder , re solder your tv, second adjust the IF transformer by using the plastic or wood stick. IF transformer is looks like a cube made of metal with an adjustment screw at the top. try to adjust it and observe what happen.
Somehow in handling the remote control I pushed a button or combination of buttons and now have a blue screen with a lock symbol in red in the top left hand corner. I've tried turning the tv off, and unplugging it, as well as a combination of buttons on the remote, but it still is there. What do I need to do to remove the lock?
Your model has a maximum resolution of 720p. What you might want to do
is make sure that both your cable/sat box and game stations are
outputting at no more than 720 resolution. It's easy to assume that all
HDTVs may accept a higher signal, and while they might, some of the
scene changes or handshakes may make that operation cause the symptoms
It is normal for VIDEO 3 to be displayed in the upper left of the picture if there is no signal present at the INPUT 3 jacks. This is to let you know that although the picture is black and there is no sound, the TV is still on. If you have a good signal at INPUT 3 and the VIDEO 3 stays on the screen, take the Sony remote, point it at the TV and press the DISPLAY button until you see "DISPLAY OFF" on the screen. About 3 seconds later, the words should vanish.
Hope you have fixed this problem by now, if that tv is unserviced, I mean if nobody has ever opened it, it could be a problem with the positioning of your tv, just tilt the tv in different positions and find out the position in which it will show the right fit. If it is serviced, especially yoke is changed, this is rare, it could be because the position of yoke is not aligned properly.
It sounds as you desribe, the vertical output IC and or the b+ feed capacitor off the Hi voltage transformer feeding the vert. IC its required voltage. Not a really hard job to replace, but not for a handi person to do. This should be left to the professional, as there are no user serviceable parts inside this set and with the HI voltage and the safety issues its best to call somesone to assist you with this repair. Good Luck