Thursday, April 14, 2011

Web server temporarily down, missing website, blog images

We are going through the worst server failure we've had in 10 years.

Bear with us and please excuse the temporary problems associated with it - is down and most of the images at are missing.

Unfortunately email is also down..for the time being you can only reach us through phone at 972 245 1979.

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 can always contact us and send the board for repair service at Coppell TV Repair!

Wednesday, April 6, 2011

How to test STK795-518 YSUS IPM for defects

This article will tell you a few quick checks for the most common failures found in Sanyo's STK795-518 used  in YSUS board LJ92-01200A and a 50'' plasma sustain board (let me know the number if you have it!).

We at Coppell TV Repair do our best to protect ourselves and our customers from bad parts, but ultimately nobody would take care of the customer than the customer himself.
Of course by publishing such information we inevitably also continue to indicate our competitors some of which we are proud to see as subscribed followers of our blog.

For what it's worth, that's the nature of this business.

Competitors, feel free to copy this and post it on your are going to do it anyway, you might as well do it with our blessing.

Now back to the task at hand.

The tests described below are applicable with the IC on and off board. Of course we strongly recommend that you apply them before you solder any IC on the board - you'll save time and you'll also increase the odds of being able to return the IC back to the vendor with least worries.

Those tests are not complete in a sense that they do not guarantee that the IC will work properly.

But they clearly indicate if it is bad and while it's not guaranteed, we find that 99.9% of the time when an IC passes them it works good on a board.

It all boils down to detecting continuity (shorts) or low resistance (ohms) between certain pairs of pins on the module..

If you find one the STK795-518 is certainly bad.

The tests can be done with the IPM on or off the board.

Here's a picture of the pins of interest:

As you can see there are 4 points of interest - GND (Ground), Vs (supply power), SUS and ER, which are the two outputs for the sustain and energy recovery accordingly. Those two are shorted on the board, but on an actual IC are NOT connected to each other.

Here's the simple rule:



This is actually 100% correct for all other plasma IPM modules.

There are 4 inputs/outputs which result in 6 possible tests (Vs-GND, Vs-SUSout, Vs-ERout, GND-SUSout, GND-ERout, SUSout-ERout), but in reality two are the most common failures that we see in STK795-518:

1) Vs shorted to one of the two sustain outputs:

2) The other sustain output shorted to ground:

Saturday, April 2, 2011

From the mailbox - no edits and no refunds!

If that blog was more advanced I'd have that as a thread and allow others to chime in.

I'll just post some of the requests and correspondences we have (if any), without any changes.

Some will be funny, some will be angry, some may even be rude.

Date: 28 May 2011
Subject: Y-sustain LJ92-01200A / LJ41-02759A REPAIR SERVICE

 hi I have a tv using this board I bought the lower buffer off an ebayer and it was shorted and blew my y sus board. I basically destroyed the board i got from him . I have an upper buffer that is bad and 2 yus boards one is pulling the power supply down the other runs but when the upper buffer is plugged in the screen flashes every second before that lower buffer i tryed and was shorted i got lines on top half with no lower buffer installed, if i sent you the upper buffer and both logic boards how much would it cost me for a new set of y sus and both upper and lower buffer boards. this tv had a bad lower buffer and i took the ysus for another tv. I bought a replacement that worked unill i got the bad lower buffer I have 2 y sus boards and one upper buffer that is bad but not shorted. thanks Erik

CTVR: ... ?

Date: 28 Mar 2011

Dear coppelltvrepair,

LGEPDP 051124............. MODEL:42V8&X3................. BOARD:YSUS............ PART NO:6870QYH005B ......... LOC:2XXX........... BOARD SIZE:285X194..... ICAN'T SEE THOSE 'CAUSE THE STICKER? IS FOR A PLASMA TV HP. ONE MORE QUESTION, IT'S WORKING THIS ITEM? THANK YOU

- camiloherevia1983

Whatever he or she wants we decided wouldn't be able to provide it.

Date: 11 May 2011
Dear coppelltvrepair,

is i am buy this item or do send you this item

- jassnyder197979