Question about JVC AV-27D302 27" TV

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Picture problem top 4 inches of screen looks whiter then the rest of the screen, sometimes lookes inverted

Posted by david ban on

  • Anonymous Apr 01, 2014

    When looking at the screen, about 15 inches from the left is solid black, with a defined stopping line going from the top to the bottom. The rest of the TV looks perfect.

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2 Answers

Kim Yearick

Kim Yearick

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Sounds like you are in the begining stages of vertical foldover. This is a problem where the vertical driver waveform is distorted due to a component failure causing the beam to not be driven all the way to the top of the screen. Usually there is enough overscan that you would not necessarily notice the picture being smaller than the crt. When this happens the horizontal scan lines, which have not decreased, are all displayed on top each other or as the condition worsens they invert. This causes the symptoms that you described. The solution I use is to replace all the electrolytic capacitors in the vertical drive circuit. There may only be one bad one but finding it will drive you nuts. They only cost dimes so we're not talking much money. Without a schematic you can usually be successful if you replace all the electrolytic caps around the vertical IC. If you are going to tackle this be careful. TVs are dangerous. Remember to unplug the set and discharge the crt High Voltage anode. Good luck.

Posted on Jun 23, 2006

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Posted on Jul 07, 2007

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Vizio E3d420vx. It turns on but the picture is only at the top of the screen about 1/2 in and the rest is black, sometimes it has grey bars running vertical in the center kinda like a upc bar code.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main digital board./

Apr 07, 2018 | Vizio Televison & Video

1 Answer

Regarding Samsung LCD TV LN37A550P3FXZA. On 4/9/17 picture became too dark, looking like brightness setting is way too low and color saturation too high -- I'll call this the "Too Dark Picture."
Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Apr 10, 2017 | Samsung Televison & Video

1 Answer

IH252 inc monitor bottom half darker than top.
Thin screen LCD monitor brightness controls operate several fluorescent lamps called "backlights" that are positioned behind the LCD display. Typically, they're located around the edges of the screen - sometimes just at the top and bottom, and other times at the left and right edges and others still at all 4 edges.

84fdffef-ec73-450a-8fb9-5901d3322462.jpg
Fluorescent "backlight" lamp, inverter & connection wiring.

The lamps are miniature versions of those sold in stores. They require a support circuitry called an inverter that convert & boosts the level of DC to AC voltage performing the functions of a ballast in a traditional fluorescent fixture.

The reason a part of your screen remains dark is because one or more of the components in the picture above has failed and will not allow the lamp to shine. Replacement lamps and inverters aren't expensive - but requires patience and the ability to disassemble / assemble the monitor (which is usually harder to do than it appears) and solder. They are available various lengths and color temperatures (you must get a lamp that is identical or it will be noticed). If this is a new monitor - you ought to return it for replacement. If used, consider the cost of purchasing a replacement (new or used) vs. repair.

I hope this helps & good luck!

Jul 29, 2013 | Computers & Internet

1 Answer

I have a Insignia NSL37Q10A, when you turn it on it display's
Change input device to some other like a DVD player. Look for loose contacts in RC jack, cable, sockets. Look for any jammed buttons on TV or on remote.

Switch off TV, switch off power, remove plug and wait for 48 hours and retry.
If problem persists, call in a qualified service technician.

Aug 03, 2012 | Insignia NS-L37Q-10A 37 in. HD-Ready LCD...

1 Answer

Horizontal line on screen sometimes
Generally horizontal lines are caused by the panel failing, you can try a new tcon but I don't think it will help.

Mar 01, 2018 | Philips FTR9955-17 DTV Receiver

1 Answer

Lg50pg25 - missing 4 inch of pcture near top of screen just red top 4 inch okay- then missing picture-then rest of screen okay even missing when using menu display. tv about 6 yr. when sat. reciever off...
Most likely a problem with the upper y-drive board.

Jul 17, 2011 | LG 50PG25 50 in. Plasma HDTV

1 Answer

Sometimes the tv picture doesnt come on apart from the screen going whiter and whiter its a 42 inch lcd
it sounds like a cap on the circuit board is on its way out.

Nov 28, 2010 | LG 42LC2D 42 in. LCD HDTV

1 Answer

Can't see picture
You either have bad 24vdc power supply or shorted out backlight inverter board, those are the two place to look, dead T-CON board can cause no picture on the screen, the screen will glow slightly.
Please read on:
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there are some troubleshoot you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Please post back what you find.

Jul 28, 2010 | Vizio VX42L 42 in. LCD TV

3 Answers

Sound but no picture
Now tv turn on,have a flicker of picture a few sec.than dies,have sound left only?Yes,than the 1 or 2 long LCD inverter boards are dead.Tries websites like Shopjimmy.com,Ebay.com to buy the 1 or 2 long LCD inverter boards for the replacement.

Jul 17, 2010 | Vizio L32 32 in. LCD HDTV

1 Answer

Why does picture look slooped at top and rest of
Thats call keystone. That happen when projector is not properly align with screen. Most of projectors come with digital keystone corrector in the menu settings. Ensure is setup to 0 and check lens of the projector is at the center of the screen. Also if the projector is too high or too low will cause that problem too. Just move it arround until you find the right place to mount it. Best of luck

May 06, 2010 | Sanyo PLC XU48 Multimedia Projector

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Vizio E3d420vx. It turns on but the picture is only at the top of the screen about 1/2 in and the rest is black, sometimes it has grey bars running vertical in the center kinda like a upc bar code.

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