Horizontal and Vertical Hold is malfuctioning and there is not manual adjustment
My TV looks like this one but the model # is 27R240T. I can't find this model# on this site. Initially the problem only occured when you attempted to change channels and occassionally would correct itself. Now it occurs even without chaning channels often when you first turn on the TV again sometimes correcting itself but often not. I've only had the TV about 4 years and this problem has been going on for the past 6 months. I've never had a TV have problems while it is so young. I have another TV I am using now that is 17 yrs old. Just a 20 " and the only problem I've had with it is occassionaly goes on or off by itself and that only happens in the last 2 years, but it isn't bad. If I can't get this model I writing about fixed, I don't think I'll get another RCA.
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Re: Horizontal and Vertical Hold is malfuctioning and...
The fault is most likely in the sync amp section, or in the video detector section, or the area where the sync extraction is done. It is very common that some of the electrolytic capacitors in the mentioned areas become worn down with age.
An experienced TV service tech should be able to troubleshoot the sync areas, locate the faults, and replace the defective parts.
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Vertical jumping may have a vertical hold issue, horizontal may have a horizontal hold issue. Most older tv sets will have some knobs or adjustable screws for vertical and horizontal hold. Turn your set on and check for these knobs on the back of your set and adjust until your picture is in as well as you can get it
sounds like the vertical adjustment has spanned beyond the screen, causing it to jump up and then upside down. after the cover is removed look for vertical adjustment and with a non-conductive screwdriver, adjust it a little bit either way to see if it fixes it, if it doesn't fix it, then look again for the right one.
to me its sound like your on the right track. there isnt a physical vertical hold adjustment. more than likely the vertical hold ic has failed. send me your email addy to firstname.lastname@example.org and i will be more than glad to email you a service manual
Look through your manual. Your manual will always give you the most specific directions for your particular model. Look for an "adjusting convergence" or "set manual convergence" section.
Enter the menu on your TV. Use the remote control and bring up the menu.
Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."
Select a color. You will have red, green and blue to choose from. Do each one, starting with red.
Press "Enter." A crosshair pattern will appear on your screen.
Adjust vertically. If there is a horizontal red line visible, press the up or down arrow keys (or channel up or down) to adjust the convergence until the line is superimposed on the horizontal-center line of the white crosshair.
Adjust horizontally. If there is a vertical red line visible, press left or right (or volume up or down) to adjust horizontally. Do this until the line is superimposed on the vertical line of the white crosshair.
Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.
Wow 5 months without a solution. NOT GOOD..
Well I hope I can help...
This sounds like a vertical hold problem, and is normally easy to fix....
There should be a couple of nob's on the lower back of the TV. One for vertical and one for Horizontal hold. You need to find the vertical hold nob and adjust it, until the rolling stops and stabilizes.
If however these nob's are not visible you will have to take TV to an engineer to fix it.
Hope this helps..
Vertical and horizontal adjust went out with black and white TV pretty much.I remember those days too...what would kids nowadays do???lol.Anyhow,the fact that it clears up sometimes when you slap it should mean that the screen is fine.Something on the circuit board may need repair.Unfortunately,I have searched for diagrams for TV's online many times and only authorized shops have the access required.I just checked westinghouse,not even a way to sign in if I were a reapir shop.So,needless to say, a shop will have to check it out.Sorry That's all I can suggest and good luck!
If you are using a DTV coverter box, you may have changed the aspect ratio with your remote control. look for a button marked "aspect" or "picture size" use that to change size.
If you have a cable box, you may have a similar button.
Or you may find a picture size adjustment on your TV remote.
If you do not have "aspect" button on your remote try going to set up menu and look for picture size.
Older TVs used to have a vertical size adjustment at the back. look in the manual.
If none of the above, you have a biiger problem with the TV internal parts needing attention