Question about Sceptre X37sv-Naga 37 in. LCD Television

2 Answers

Power supply dead... is it fixable?

I'm mostly a computer guy myself, and I've never messed with soldering or anything that advanced, just the easy installations and stuff. Anyway, my LCD TV died a while back and just last week I found a fix:

Solution #1 here: (not my question, but the solution fit my scenario)
http://www.fixya.com/support/t2344092-sceptre_lcd_tv_power_come_but_no

It worked fine for a few days and now it stopped working. I tried using a thicker piece of plastic like it says but that didn't work either.

I decided to examine the board a little closer (keep in mind my little experience here) I had already noticed the scorch marks around about 3 or 4 pins on the bottom of the board (which led me to the above solution). I looked closer at those pins and they didn't look quite right, as if they were possibly no longer getting contact with whatever they need to. On a couple of the pins, if I hold the board up to the light, I can see through the board through small holes next to the pins (which didn't look normal to me) I also noticed the pins didn't all have the same amount of metallic substance (solder?) around them, which worried me as well.

When I power the board, I see a quick flash of electricity on one of these pins, and then the rest of the TV doesn't get power. (No standby power LED like usual)

My question is whether or not this is fixable or if the board is completely dead and in need of a replacement. I'm seriously hoping not, as the replacement would probably be $150+ and I currently have no money or job.

Here are some pics of the group of pins I'm talking about. Not the best pics, but perhaps they can give you some ideas:

http://img44.imageshack.us/img44/6640/61011685.png
http://img10.imageshack.us/img10/4076/95469746.png
http://img30.imageshack.us/img30/5230/61221001.png
http://img96.imageshack.us/img96/3318/70494395.png

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  • morphinapg Oct 02, 2009

    Yes, I just googled Dry Joint and it looks like this is most likely what I have. It looks like it wouldn't be too difficult to fix as long as I could get someone I know to do it for me relatively cheap.

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I resoldered those pins on my, but you need to clean them real well first, this is common problem for this model. Any good repair shop should be able to resolder the board for you.

Posted on Oct 24, 2009

Testimonial: "Would this be expensive? I might know a friend or two that might know how but they might not be available to do it right away."

  • Bud Martin
    Bud Martin Oct 25, 2009

    If your friend knows how to solder and has 40watt soldering iron, he should be able to do it. I bent the leads of the old parts down before soldering to the copper pads to give more area for the solder to stick to. The NTC THERMSITOR that has poor connection because it used for soft start to reduce inrush current when the set is turn on so the TV will have less stress during turning on, the bad part is that the NTC Thermister will first get hot and the resistance will go down to let full current to be supplied to the power supply section, when you turn off the TV the NTC Thermister resistance will go up as it is cooling down. This is called thermo cycle and can put al ot of stress on the solder pads, causes poor connection and heat built up at the cold joints and finally goes open. If you remove the PCB and take it to the repair shop, they should be able to resolder for you for less than $30.

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Sounds like a dry joint, or adjoining pins are being shorted, will try and have a look at your pics

Posted on Oct 02, 2009

Testimonial: "Thanks for the info, it looks like this is probably the problem. Hopefully not too difficult to fix."

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