Question about Standard (CRT) Televisions

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33 inch Panasonic gaoo bought in 95 picture trble

When tv is powered on screen is normal except for the appearance of horizontal lines on top of screen approx. 5 inches wide when tv is warmed up lines seem to slowly dissappear.... i suspect it main be power supply related
need confirmation
Thanks for any suggestions

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Re: 33 inch Panasonic gaoo bought in 95 picture trble

Check for leaky capacitors in the vertical section of the TV or cold solder joints.
I would also check in the power supply.
Good Luck.

Posted on Jan 16, 2008

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About 2 inches of the top of my screen won't show. Sometimes it will turn into a line that runs through the center horizontally. If I hit it it will go back to normal except still missing the top 2 inches

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1 Answer

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The Panasonic Gaoo sets were top of the line in it's day, the problem you are describing is a vertical deflection issue caused by bad solder joints and a few parts. I recommend a tv technician to fix the set.

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A/V Media Guy

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1 Answer

No vertical deflection, only a thin horizontal line.

Hi and welcome to FixYa,

A few ideas you may want to consider/explore;
  • While it is true that capacitors do dry out, the values that you posted (22uF & 32uF) are relatively low for the pump/boost capacitor which is responsible for the "top of the picture was a couple of inches short". Normally this should be around 100uF connected between pin8 & pin 12 of LA7836;
  • agree that the Vertical IC LA7836 is busted hence the single line;
  • in most vertical designs, there would be a diode from pin7 that goes to pin12 that needs looking into for a leak;
  • pin7 is the Vert B+ ~ 24VDC while pin1 is secondary B+ 9 ~ 12 VDC. In some designs to accomplish this, there is a dropping resistor from pin 7 to pin 1 and sometimes a zener diode from pin1 to GND parallel with a filter capacitor;
  • pin11 is the vertical output that goes to the yoke. From the yoke some design uses another capacitor (about 1000uF) before going to the ground through a low resistor (~ 1 ohm);
  • above mentioned parts need to be checked out of ciruit preferable and special attention to possible leaks of the diode when testing in reverse bias mode.
Good luck and thank you for using FixYa.

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Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.

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Do you have to tap on the left lower side (facing the T.V) are the lines thin and white?
Has the T.V. ever turned off by itself?

This set was made in Mexico and Panasonic have HAD problems with dirty solder joints, "dry solder joints" as thay are called, expand and "open" with heat and age. Thay can "fix themself's" when the set is allowed to cool down or if you tap the joint back together. That is untill the set gets hot again and the joint expands get the picture?
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Hope this helps, sorry about the delay never been on this site untill today!
See Ya from Waterloo, Ontario CANADA.

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