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CHASSIS: PA73E

Its seem the vertical capacitor is short or beginning to fail.

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You can use a capacitance checker to test the capacitor if it was already leak.

Posted on Apr 28, 2013

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6ya6ya
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I have 5 horizontal distorted line on my screen even with no device attached is this a processor problem


Hi


Thanks for using FixYa. From what you have described it seems that the issue is with the defective capacitor in the vertical output circuit of the chassis. This is a very common occurrence in many CRT based TV's. Since the vertical deflection circuit has now failed altogether, there is a protective mode built into the TV that prevents anything from showing on the screen since a bright horizontal line can burn a permanent line into the projection CRT's. If you have electrical expertise and know how to solder/re-solder components it can be done by you if not then you’ll need to have a service technician or someone with the proper technical experience determine which electrolytic capacitor has failed and replace it.


Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks

Rylee

Dec 29, 2009 | Toshiba TheaterWide 52HM84 52" Rear...

Tip

How to discharge a microwave oven's capacitor:


Discharging a high voltage capacitor<br /><br />Discharging your microwave's capacitor is absolutely essential in preventing injury to your microwave, your tools, and yourself. A capacitor stores large amounts of electricity even when your microwave is unplugged, and it must be discharged before beginning any repair.<br /><br />A capacitor is discharged by creating a short circuit between each of the two capacitor terminals, and between each terminal and the chassis. The chassis is the metal mounting (bare metal surface) of the capacitor. Read these directions thoroughly before you proceed.<br /><br />With your microwave unit unplugged, touch the blade of a well insulated screwdriver to one terminal. Gently slide the screwdriver forward until it reaches the other terminal, holding it there for a few seconds. Be aware that this often results in a loud and startling 'POP'.<br /><br />Repeat this procedure in order to create a short circuit between each capacitor terminal and the chassis (bare metal mounting plate surface). This same method can be applied to a capacitor having three, and not two, terminals.<br /><br />I hope this helps.<br />

on Dec 02, 2010 | Microwave Ovens

1 Answer

Just a straight line instead of a picture


A straight horizontal line across the screen means you have no vertical deflection. Could be as minor as a bad solder joint, a failed capacitor, or the vertical deflection IC is bad. Or shorted diode, burnt resistor....

Jul 14, 2009 | Televison & Video

1 Answer

Vertical lines on screen of my 42" plasma


Capacitors on Y-Axis board beginning to fail.
Soon the bars will be permanent - get the tv fixed before they are burned into the screen.
Repair is under $200USD (mostly labor)

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Jun 17, 2009 | LG 42PC3D 42 in. Plasma Television

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.

Jan 30, 2009 | Panasonic CT25G7 25" TV

1 Answer

No vertical deflection,only a thin horizontal line.


Hello dede27,

I suspect you have some background in electronics so I'll ask you some questions.

First, I know that you changed the output ic and a capacitor, the capacitor caused excessive beam current, that's bad, remember that beam current is dangerous because it can produce X-Rays. Remember to use the exact value of parts for X-Ray generating areas of the TV. So replace the C555 with the rated value by the manufacture.

As far as the vertical deflection problem it sounds like you may have a shorted vertical deflection coil (part of the yoke transformer). I would suggest testing the coil to see if it is shorted (A ring test will determine this). The Sencore LC102 has a ring test feature or you can lookup how to build a simple ring tester. In any event replace the IC and test the yoke transformer for shorts on the vertical winding.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Jan 30, 2009 | Panasonic CT25G7 25" TV

1 Answer

Horizontal lines across the top of the screen


Hi and welcome to FixYa,

Your described problem is indicative of a failing or near end of life capacitor in the vertical section. The capacitor (often called pump capacitor) would be in the neighborhood of 100uF 35V and physically near the vertical IC. In some JVC models, the vertical IC would be an LA7838 or LA78041 usually a single inline package on a heat sink.

Cost wise, the capacitor is relatively cheap a dollar or less. What would be more challenging is getting access underneath the PCB to de-solder and solder in the replacement.

Pls post back result(s). Good luck and Thank you for using FixYa.

Jan 14, 2009 | JVC AV-27530 27" TV

1 Answer

My tv has this lines that bend over the front top of the screen and when an object moves through the lines the image appers from the the top of where the line begins...and the tv goes black every once and...


This sounds like a vertical deflection fault. There are some components that are failing in the vertical deflection area that are starting to fail. It is very common in many of the sets that there are electrolytic capacitors in the vertical amp section that are gong out of specifications.

When you have at the top or the bottom of the screen where the vertical axis is compressed, and the picture in the compressed area looks like it is inverted and going over on itself, this is called "vertical fold-over".

An experienced TV service technician should be able to service this for you.


Jerry G.

Apr 18, 2008 | Televison & Video

1 Answer

CS-27403


Older Mits TV's have a PIP circuit board that fails,upsetting the video....here is the solution....

1) Remove PIP PC board ..... discard

2) pull chassis... on underside of main board, locate VP plug

3) Using 22mf 50v NP capacitors, connect pin 5 to pin11
and pin 7 to pin 9......

large pix stable.....but no PIP box.....PIP PCB NLA......

.................T.

Jan 27, 2008 | Mitsubishi VS-45605 50" Rear Projection...

2 Answers

JVC AV-K21TR


The faint white lines at the top of the screen is the warning that the pump-up capacitor in the vertical output circuit is going bad and the output itself is about to short out. When the TV stops working, the vertical output IC has finally shorted out. Replacing the vertical output IC, the pump-up capacitor and possibly a small value resistor next to the flyback (B+ for the v-out) should bring the set back to life.

Jan 26, 2008 | JVC AV-27230 27" TV

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