Question about JVC AV-27230 27" TV

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Tv image horiziontal lines on top of screen, sometimes picture looks reflected from the top of screen in those horizontal lines

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Re: tv image

Hello bouloulou, Well let me tell you what you have is a loss of Vertical Linearity. This could be cause by a power supply issue or by inproper filtering of the dc voltage used to supply the vertical section of the TV. There used to be a control which allowed you to adjust this along with Vertical Size which controled the bottom of the screen. These days the signal processor chip takes care of this along with a few capacitors. I woould suggest that if you do not have a background in electronics that you take the set to a shop for repairs, If you do have a background in electronics, get a schematic for this set and the use your multimeter set to DC volts to measure the DC levels in the vertical section of the TV. Also you will need an oscilloscope to measure the ripple voltage on the DC power supply the schematic will show you how much ripple is allowed. I hope this helps. Thank you, Shuttle83

Posted on Oct 08, 2007

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White lines across tv screen

Without seeing the lines I can't be sure what your set has wrong, but here are a some possibilities:

If the lines are lines are confined to the top inch or two of the screen and the picture looks otherwise normal, the trouble is bad capacitors in the vertical output circuit. Fixable by replacing the bad parts.

If diagonal lines are across the entire face of the picture tube and the picture looks washed out, the trouble is often a bad capacitor on the 200-volt line to the picture tube. This may be on the main circuit board near the horizontal output transformer, or on the small circuit board plugged onto the end of the picture tube. Again, replacing the bad capacitor can fix this.

If your TV is actually an RCA, someone may have bumped a rear-panel adjustment. On the back of the TV near the bottom right are two small knobs. RCA left these adjustments exposed inside of putting them inside the set like other manufacturers. These sometimes get bumped if someone was behind the set cleaning, or if a pet got back there and hit them with a tail. The top knob adjusts focus, and the bottom knob adjusts something called G2 or screen voltage. If this gets turned up too high it can cause the faded picture and diagonal white lines. Turn the adjustment down until a black screen looks black instead of gray.

A bad picture tube or horizontal output transformer can also cause lines through the picture. If this is the case with your set, it's time for a new TV. The transformer is relatively inexpensive but labor costs aren't, and the repair bill may exceed $200. If the tube is bad, there's no point even considering repair. The tube cost alone exceeds the cost of new TV.

Hopefully your lines are easy and cheap to fix. Good luck, and thanks for using Fixya!

Jul 22, 2011 | RCA F35673MB 35" TV

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White horizontal lines on top of the screen otherwise picture OK.

This is a symptom of what is generally a leaky or open filter capacitor in the vertical sweep circuit. Vertical foldover, where the image actually is reflected upside down an inch or so into the top of the picture, is common in this problem. There is an IC that controls the signal and sometimes it needs to be replaced, but more often it's one of the filter capacitors nearby. Any competent technician can fix this problem and the capacitors only cost $2-3 or so if you can find the correct value at Radio Shack (that's if you pay full retail for them). A good service tech will probably have these on hand. Testing them is easiest with what's called an ESR meter (stands for Equivalent Series Resistance) and the better ones don't require you to unsolder them from the circuit board before testing. The most expensive part of this repair is going to be the technician's labor. They're good TV's, this is just a problem common to most TV's in general - mostly due to aging of the capacitors from years of heat. A higher quality replacement capacitor will solve the problem for the life of the set.

Mar 28, 2009 | Toshiba 32A14 TV

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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

Horizontal lines on top of phillips tv

bad feedback electrolytic in vertical circuit. need tech.

Nov 23, 2008 | Philips TP2797B 27" TV

1 Answer

Unstable image on television screen: Hitachi Model # 27CX3B

Check for poor soldering around Vertical Driver Ic.

Nov 11, 2008 | Standard (CRT) Televisions

1 Answer

Philips tv 27PT6441/37 horizontal lines about 3in wide on top of the screen.

I'm having the same issue with this TV! From the top of the screen to about two/three inches below there are thousands of horizontal lines with a whitish tinge which seem to be reflecting what is just below these lines! I’ve never seen this issue on any TV ever! From what I am seeing now is that many people are having this issue and more! We should put a class action lawsuit against them! If anyone knows anything, please post the info. Many tech forums are loaded with issues for these TV’s but this issue seems to be prominent!

My mom had two Phillips TV’s; one just under two years, and the other just under a year and Phillips refused to fix either without a large expenditure on her behalf. She told me never to buy Phillips and I should have listened. Phillips used to be a great company so I don’t really know what has happened? This was a TV for my Grandmother and it wasn't at a bad price not to mention the picture was great albeit severely over scanned.

As for her TV, we had it about two weeks over a year and Phillips said there was nothing they could do! They said they would pay for the cost to replace the tube if I took it to one of their dealers but they said the cost to bring it there and repair would fall on me! Also if the issue was not related to the tube I would have to pay everything OOP! The lady laughed on the phone and said even if it had been under six months or under a year they would still only pay to fix the parts and everything else would cost me! WTF?

The moral of the story is NEVER BUY PHILLPS/MAGNOVOX EVER! You might be getting the TV deal of the century but it is not worth it in the long run. I originally thought my mom was nuts, but now looking back considering the issues others are having, and realizing the **** poor way Phillips support deals with ALL problems, they’re simply not worth the money or trouble. I WILL NEVER buy another Phillips, Magnavox, or Funai product ever again, whether it is a TV, clock, DVD player, and/or ANY electronic device! If you do you HAVE BEEN WARNED and WILL BE SORRY!

Nov 07, 2008 | Standard (CRT) Televisions

1 Answer

White lines & inverted picture at top of CRT TV image

This problem is normally the Vertical filter capacitors. You need to have them changed before it burns out the Vertical Chip.

Good Luck
NC Electronic
Mills Wyoming

Jan 07, 2008 | Standard (CRT) Televisions

1 Answer

Horizontal lines

it is due to electrolytic capacitor failure in vertical output section.

just get it replaced.

it very very common & minor problem.

good luck.

Oct 17, 2007 | Toshiba 27AF43 27" TV

2 Answers

Horizontal 'pinstripe' lines on all channels

sound like the screen control on the flyback is set just a little too high. the flyback has the red wire attached to the tube. the flyback has 2 small adjustable controls. if you look close enough 1 is marked focus & on is screen. turn the screen slightly to the left & look at your picture. the screen is like a master brightness & if it's up too high you will see what is called retrace lines. good luck.

Jan 16, 2007 | Daewoo DTQ-20N3FC 20" TV

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