Tuesday, April 12, 2011

Insignia NS-L42Q-10A / NS-L42X-10A does not power, bad power 715G3196-1

If your Insignia NS-L42Q-10A is completely dead upon connecting to power chances are it has bad power supply.

(come to think of it, the same is true for pretty much any electronic appliance, isn't it? :-)

Well in case of the NS-L42Q-10A and its sister NS-L42X-10A it is rather likely that it's the power board.

I've seen few of those already and they all had similar problem - lack of the standby 5V power and everything else from there on.

The power board's model is 715G3196-1 and it looks like this:


The problem was relatively easy to spot on the first of the boards and a little more obscure on the others.

It was the SMPS driver IC IC901 that was burned. On some boards it has shorted and that did burn a few other components in the circuit.

On some it was apparently burned open and although maybe a bit overheated the other components had survived the failure.

Based on those experiences we've assembled a simple repair kit containing the components that are most likely and usually burned - IC901, ZD906 and R950.

This blog is hopefully useful in confirming that this seems to be a common problem for this board and naming the components you need to pay attention to.

Granted, over time it may turn out there are other problems as well. We'll update the blog if and when we know more.

In the meantime, you can try and source the components by yourself or you can use our kit for what we consider a quite reasonable price.


If you like the idea...give it a try:

If you don't then...well, good luck sourcing :-)

And if you don't feel like doing that by yourself...you can always contact us and send the board for repair service at Coppell TV Repair!

2 comments:

Spork Schivago said...

I have this television. When I connect power to the TV and hit the on button, nothing. No LEDs are lit up, it doesn't turn on, it's dead. However, in my case, it is not the power supply board. I thought that at first and mistakenly bought a replacement board. It's getting the 5VDC standby. But when I hit the power button, there's no 12VDC or 24VDC. I've seen someone with a similar main board but it was from an Hitachi with a similar problem like mine. For his board, they thought it was a short some wheres. I'm thinking the same. I replaced a blown capacitor, thinking it'd fix the problem, C743 I believe. Also, I replaced a 1.8V voltage regulator, U702. I thought the voltage regulator was bad. I set my digital multimeter to ohms and checked the resistance of each pin on the voltage regulator and ground. For each pin, I was getting very low resistance. Pin 1 read 0.0 ohm, pin 2 read 0.4 ohm, pin 3 read 0.4 ohm. Even after replacing the voltage regulator, it still tests the same. Do you guys have any ideas as to what might be wrong with the main board? Or do you guys sell a repair kit for that board instead of the power supply board? Thank you.

Spork Schivago said...

I removed U702 and checked the resistance between the empty pads on the board and ground. They both read 0 ohm resistance. So it looks like there's a short some wheres.

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