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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

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  • 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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Anonymous

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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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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./
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Apr 07, 2018 • Vizio Televison & Video
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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."
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http://electronicshelponline.blogspot.com/
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IH252 inc monitor bottom half darker than top.
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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!
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Jul 29, 2013 • Computers & Internet
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I have a Insignia NSL37Q10A, when you turn it on it display's
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Switch off TV, switch off power, remove plug and wait for 48 hours and retry.
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Aug 03, 2012 • Insignia NS-L37Q-10A 37 in. HD-Ready LCD...
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Nov 28, 2010 • LG 42LC2D 42 in. LCD HDTV
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Can't see picture
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Please read on:
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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.
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Jul 28, 2010 • Vizio VX42L 42 in. LCD TV
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Sound but no picture
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Jul 17, 2010 • Vizio L32 32 in. LCD HDTV
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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
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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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