Question about JVC LT-42E488 LT42E488 42 inch 720p Flat Panel LCD TV

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JVC LT42E488 Color Issue

The color on the screen is very yellow. I was told it may be the color tube that went out and I may be able to fix it by replacing the main board. I need to know what I do to fix the color so that I buy the right part!

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  • JVC Master
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If you have a flat screen LCD TV then there is NO color tube. Somebody is blowing smoke. Don't deal with him. The main board in conjunction with the screen controller board are the places to look.

Posted on Jan 06, 2014


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Here is a link to a website that sells the original stand that came with the TV. : )

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SOURCE: Power supply board not the problem- need further input please

Typically if one inspects the boards in question you may find evidence of heating and damage. Sometimes with newer solder having no lead, hot spots tend to leave cracks around the joints of parts heating and cooling and once they arc they fry components. One can usually smell a burnt component altho hard to describe the smell. I would look for burnt fuses on the power board where the power first enters the back of the tv, and some fuses are covered with a plastic sheath and looks like another type of component. A tester comes in handy... I suggest that you look more at the board that gives the high voltage to the TV screen, as there are step up transformers (square blocks) that give a lot of trouble and the transistors surrounding those blocks, usually 4 transformers. I would test for continuity around these areas but the transformers should be pulled from the board for a more accurate test. Inspect transistors (black with three prongs) usually has an aluminum heat - sink attached to it for cooling, anything more than 3 prongs is probably an IC or integrated circuit chip. These are more difficult to test. A diode will allow power one way but not the other so reversing the polarity tester tips will give you a voltage or nothing in reverse. Transistors are similar to a diode in that you can test it one way but it shouldn't be a reading the other to try to keep things simple. Typically when a transistor goes it will burn a hole in the face or on top. A capacitor looks like a mini soup can and swelling on top a hole on top or liquid stain under it is an indicator that it's bad. Typically the top is swelled and the plastic coating bares most of the top of the capacitor. If one inspects other capacitors in that area you can notice the difference even though indicators are slight at times. I would at very worse put the screen part away until you found a suitable tv model with a broken screen perhaps on kijiji. Typically it is a capacitor that has blown but may only lead to a partial solution to the problem if several parts are gone which is usually the case, a capacitor or two as well as a transformer or a transistor; and one must also inspect and test other components in that same area for success and to inspect the circuits for cracking around components especially where the hot areas are and one can usually see these hot areas due to the discoloration of the board in these areas. These hot areas are usually the problem. One overall solution is to build a big fan into these tv's lol and put surge protector bars on all your expensive electronic components.

Posted on Dec 05, 2013

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