Question about Standard (CRT) Televisions

1 Answer

Zenith console tv model sentry 2 27 inch

The picture will start normal (full screen) and then shrink down to a small band about 1/3 the size (in height). the picture is actually sqished at this point. The screen still has good clarity and color.
If you tap the curcuit board (lightly) or even the side of the tv ( a little harder) the picture will come back for a few seconds then shrink back down. can you help me with a possible solution to my problem?
Thank you,
WJ Carlilse

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 45 Answers
Re: zenith console tv model sentry 2 27 inch

Resolder the vertical deflection section. Change pump up capacitor if it has one...100uf is a typical value. Is the vertical output some flavor of LA783x ?? May need to replace. A model # would help.

Posted on Nov 04, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

27 inch Zenith TV Vertical too big

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

Mar 03, 2010 | Zenith C27A24T 27" TV

1 Answer

I have a 26inch Console Zenith Color TV, when I turn it on, I get a full pidture and sound but after 30 seconds, about 6-10 inches of the bottom screen goes black--but the rest is ok???


Get the remote control and press the MENU key repeatedly until you see the Video menu at the bottom of the list of options you will see EZ Picture.
Use the up/down arrow keys to select EZ Picture and use the left/right arrow keys to select your preference. Set the preference to Preset not custom.
Press Enter, Quit or Menu to exit. See if resetting the TV's Picture settings resolves the problem.

If you have a bar at the top of the screen as well then it could be in letterbox viewing mode. Again just go into the Video menu and turn it off.

Please let me know how you get on.

Good luck.

Jan 14, 2010 | Zenith C27A24T 27" TV

1 Answer

After a few minutes picture shrinks to single line on screen and then powers off

Since the set works initially, there are likely poor solder connections at the vertical IC. If this is not addressed soon, the IC will fail and need to be replaced. The vertical IC is a small flat IC with about 11 pins or so that may be marked LA7837 or something similar. Try resoldering the pins first. If that fails to resolve the problem, replace teh IC. Feel free to post the marking here so I can verify you have the correct one.


Jul 30, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

GE 31

check electrolitc capacitors in horizontal circuit

May 09, 2008 | GE 31GT659 31" TV

1 Answer

Picture size is shrinking within screen

hi there, you have vertical section prob., repalce imeditely the electrolytic capacitor at the vertical section. do some test and check up. ty

Feb 18, 2008 | Philips 27MT3305 27" TV

1 Answer

Zenith TV

buy a new one its had a good life

Oct 08, 2007 | Standard (CRT) Televisions

1 Answer


Since you can bang it to heal it some, try checking for cold solder joints. Caps and IC's next. Careful TV's store up to 3000 K volts unplugged. Enuff to kill.

Sep 10, 2007 | Standard (CRT) Televisions

1 Answer

Picture Shortens, Converges, eventually the set shuts off - $50 for Correct Solution

Open the TV amd turn it on in a position you can see the picture, possibly through a mirror. Now gently tap all of the metal heat sinks on the circuit board until you find the one that is sensitive it will have a small chip mounted vertically on it, with probably like 7-10 pins. The number on the chip will most likely be an "LA****" number. Now turn the circuit board (UNPLUG FIRST) over and resolder the pins. This is your problem 99% of the time. Be very careful there is High Voltage inside this TV.

Apr 26, 2007 | Zenith IQB36B42W TV

Not finding what you are looking for?
Standard (CRT) Televisions Logo

Related Topics:

430 people viewed this question

Ask a Question

Usually answered in minutes!

Top Standard (CRT) Televisions Experts

The Knight
The Knight

Level 3 Expert

66444 Answers

matt martin
matt martin

Level 3 Expert

1187 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Standard (CRT) Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides