Friday, April 28, 2017

Repair for DELTA DPS-171CP A / DPS-162KP-1 power Sharp LC-70C7450U LC-70C8470U LC-70LE847U now available

This is just a simple announcement that Coppell TV Repair LLC is now offering a repair service for power supply board DELTA DPS-171CP A and other boards based on PCB DPS-162KP-1 as shown on the image below. The following Sharp models are known to use DPS-171CP A:

There are several different problems we've seen with this board.

One is where the board is totally dead and there is no +5V standby voltage. The TV is then totally dead, of course.

Another is failure to turn on upon being told so by the main board; this results in series of two fast and two slow blinks in the TV.

There sure are failures we have not seen yet.

Monday, April 24, 2017

Which board to send for repair - original or one from eBay?

QUESTION from the mailbox:

Item: VIZIO XVT473SV REPAIR SERVICE FOR MAIN BOARD 3647-0312-0150 / 3647-0312-0395

Dear coppelltvrepair,

Have two boards, original and one purchased on line. The original has the blinking logo- will not turn on. The purchased one (got screwed) seemed to work, but no picture or audio at any port, otherwise responds to inputs.

Which card would be best for repair. No sense it repairing both of them.

(short): Send both!
(long) : A component level repair of something you have not yourself created is hardly ever a certain thing (more on that shortly) and the truth is we do not know for sure if either of the two, or however many boards you have, will end up functional. We have some statistical data, of course, and if listing is still up then this statistical data is in our (and your) favor that yes, it will be, but it's still not a sure thing.

Without knowing what is wrong with a board it is wrong to assume it can be fixed and without having seen and inspected the board it is wrong to assume its condition.

We do know for sure, however, that the more boards we receive, the higher the chances of a) us having them at least one fixed and working well; and b) us failing to service one, at least in a matter that makes is practically meaningful for both parties.

The very best guidance we can give is that we do NOT want boards that have visible signs of tampering (says so in the listing), traces of rust or other reactions resulting from nature or human impact on the board.

I can also say boards from random, small eBay sellers can easily come with invisible and possibly fatal defects; say user Joe has parted his TV and possibly a few other TVs and has made a little side business selling parts...Joe wouldn't be handling boards professionally, he's probably stacked them somewhere or threw them all in a box and when one sells he just goes hunting for it in one of the boxes and pulls it out.

Boards lay back to back, they scratch off each other and SMD capacitor or resistor or diode easily gets ripped off in the action. Good luck finding it!

Of course you aren't guaranteed against that happening with any board, but you get the point.

So to summarize, if you have one or more boards you pick the one that looks the most neat and send it if you want to send just one, or you send several if you want to increase the chances of us producing a working board.

You can have the rest back, we won't repair and charge you for more than one if you want one. You may end up paying a little extra and , worst case scenario, you may received back a board that has been worked on and it's still not functional, but that other board you'd send may as well save you another money and time for the mere cost of a combined shipping surcharge.

You can have your boards back or you can leave/sell them to us (no guarantee we'll be buying anything, but we might make you an offer if you indicate you do not need more than one back).

Thursday, April 20, 2017

How to test Sony KDL-50EX645 power supply DPS-162LP / 1-895-316-11

I just made a video for a customer on how to test the board we've sent him as well as his own Sony KDL-50EX645 power supply DPS-162LP and I thought I'll include a link to it here:

The most common failure of DPS-162LP causes the TV to be blinking 7 times, and is manifested in lack of 24V upon signaling the board as shown on the video.

Of course other failures are also possible.