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JVC LT-37X688 37 in. LCD HDTV Questions & Answers
I a 2007 JVC LCD HDTV and when I turn it on it is
I am guessing the CCFL tube is starting to burn out. Replacing is not impossible but somewhat delicate process.
Since the TV is that old i would recommend you to buy new TV instead when it goes completely dead.
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.
No video
I just tried re-setting the digital tuner, which for the JVC LT-37x688 is as simple as powering the TV on, and holding the chanel down and volume down buttons simultaneously for about 3-5 seconds. The screen will go to black, and the TV will power off. Turn it back on, and you get the JVC logo again as everything re-sets. This solved my problem with vertical colored bar lines vice a picture, and sound.
37
Sounds like a Tab Issue,Connections are Become Bad on the Inner Connections to the Screen,The Real Fix would be to Replace The Panel
When turning on the TV,
Hello,
Al Plasma and Lcd TV have boards that control vertical and horizontal output to their respective areas. They are connected to the screen by ribbon cables. If one of these boards fails all together, has a failed chip, a bad connection, or a bad ground somewhere it will result in a black line in the area of that board. A bad ribbon cable connection on the bottom will result in a vertical black bar though the screen. Many times resetting the connection will fix it, if the ribbon cable has been nicked there could be a severed connection. They an sometimes be fixed, but it is a pain. An yes I have done it, but the bar is gone. The same will happen if the chip that outputs to that area opens. The connectors are the first place to look paying close attention to the cable, they are extremely delicate so great care must be taken if you decide to tinker with em, the usually have lift locks that release them, but it is very easy to wreck em. Good luck.
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