20 Most Recent JVC LT-37X688 37 in. LCD HDTV Questions & Answers

Sounds like a panel issue, you may need a new TV

JVC LT-37X688 37... | Answered on Mar 08, 2018

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.

JVC LT-37X688 37... | Answered on Feb 07, 2018

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

JVC LT-37X688 37... | Answered on Nov 06, 2017

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.

JVC LT-37X688 37... | Answered on Dec 05, 2013

replace the power supply...ebay sells them; the power supply has a number on it to tell you which one you need (be sure to leave the set unplugged for at least a day before you replace the power supply (to avoid a nasty shock from the charged up capacitors on the power supply board.

JVC LT-37X688 37... | Answered on Dec 03, 2013

Check the cable. If the TV has more than one HDMI input, try another one.

JVC LT-37X688 37... | Answered on Sep 11, 2013

Check for any loose connection to contacts between T'Con board, and display panel. Re-seat all the flat cables connected in between. If you wish to get more details, check this link. Pull up older posts there.

JVC LT-37X688 37... | Answered on Mar 12, 2013

If the earphone jack works the set is ok---that socket can cause this issue if dirty or worn inside.

Check also in menu internal speakers are not turned to OFF or external.

JVC LT-37X688 37... | Answered on Dec 22, 2012

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.

JVC LT-37X688 37... | Answered on Jan 12, 2012

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

JVC LT-37X688 37... | Answered on Dec 30, 2011

Press Mode button to select TV. Then press the Display button. Set the Display to Off (choices are Detailed Mode, Clock, Simple Mode and Off). Pressing Menu should turn off the Display at any time.

Support for the LT-37X688 is available from JVC at http://support.jvc.com/consumer/product.jsp?archive=true&pathId=78&modelId=MODL028191 . The direct link to the manual is http://resources.jvc.com/Resources/00/00/92/YA535ien.pdf .

I hope this helps.

Cindy Wells

JVC LT-37X688 37... | Answered on Jun 11, 2011


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.

JVC LT-37X688 37... | Answered on May 25, 2011

That can be bad T-CON board or main board itself, more likely to be the T-CON board, you can also try reseting the ribbon cables on the T-CON board first.
Parts: http://www.shopjimmy.com/catalogsearch/result/?q=JVC+LT-37X688+

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:
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

JVC LT-37X688 37... | Answered on Dec 01, 2010

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