The title of this article is purposefully made to match a particular listing on eBay.
I am sure it will eventually become invalid , so I am not going to post a link to it here, but I am going to post a picture of it while it's still active and explain why is it a fraud and from there, how many eBay listings in the "electronics>parts" category are fraud.
Here is the listing (click to see full screen):
This listing is definitely a fraud!
First, the specified buffer boards have been manufactured in 2006/2007 and because they go bad so often (as I've written before) at some point in 2010 pretty much all vendors here in USA exhausted all their availabilities. There was a period of time during which the boards could simply not be found and we, like some others, had to rely on repairing the original buffers.
Repairing the old buffers did not prove to be cost-effective (for reasons explained in the above referenced article) , but luckily Samsung has responded in a fast manner (for a company their size) and produced the new batch of buffer boards , which now have 4 buffer ICs (100 bits each) as opposed to the original ones that have 6 ICs with 64 bits.
Granted, this is a logical argument, not a proof that the boards listed here are old and used.
But wait, there's more!
All OEM buffer boards of this kind come with a revision model stamped on them.
The oldest ones are revision A1 and the latest ones (of the 6 - IC model) is A5; every TV sustain set we have seen here that has never been opened before (and we've seen easily hundreds) comes with buffers that have A1 to A5 on them.
Oddly enough, buffers sent to parts distributors come without revision label on them. I am talking about the ones that were in the distribution network before they got exhausted.
I don't know if that is on purpose or not, but again all the old style replacement buffers we have seen have never had revision label on them.
This, by itself, is still not a definite proof that the listing is a fraud, but you have to agree it adds up to the logical conclusion.
The final argument is probably the weakest one, but I'll present it anyway since it does have value to me.
As I've blogged before, we are not new to importing from China.
My conclusion working with various electronic components vendors is that they are not so much committing fraud on purpose as they are simply not at all understanding what are they selling.
Perhaps someone in the supply chain there is clearly aware what they are doing , but it's usually not the dealer you communicate with; those dealers are often willing to learn and provide feedback back to the chain so that they do not lose your business.
How well does that work is another story.
But my point here is that based on experience I can easily guess that the seller doesn't even know that what they describe is, well, a nonsense. They probably offer it in good faith hoping to earn some valuable American dollars.
Looking at their other sales and the listing's description only adds to that theory; oh, and referencing the boards by their pure PCB IDs instead of the assembly ID (LJ92-XXX) or the marketing component ID (BN96-xxx) is yet another strong indicator that they have no clue what are they selling.
Bottom line?
Beware what you're buying...or you'll get what you deserve :-)
Showing posts with label learning. Show all posts
Showing posts with label learning. Show all posts
Saturday, March 31, 2012
Monday, February 1, 2010
Y sustain 6870QYC004B / 6871QYH039A / 6870QYC104B for 50'' plasma burned - no image
====================
2011 UPDATE:
Related article(s):
http://blog.coppelltvrepair.com/2011/10/when-6871qyh039b-fails-should-buffers.html
http://blog.coppelltvrepair.com/2010/02/hp-pl5060n-problem-6870qzc004a.html
http://blog.coppelltvrepair.com/2010/10/vertical-or-horizontal-color-lines-in.html
Related products and services:
50'' LG YSUS BOARD REPAIR SERVICE BY COPPELL TV REPAIR
REPAIR KIT FOR LG 6871QYH039B SUSTAIN BOARD
====================
The 6870QYC004B sustain board is made by LG and used in various 50'' plasma televisions - both LG originals and branded versions like Insignia, HP, Maxent, Sony etc.
The board has several different revisions, possibly according to licensee or technology used or revision...don't know for sure.
Those boards are 6870QYC004A , 6870QYC004B, 6870QYC004C, 6871QYH039A,
6871QYH039B, 6871QYH039C, 6870QYC104A, 6870QYC104B, 6870QYC104C, 6870QYC104D and possibly others.
To the best of my knowledge each of these boards is compatible with others and can be used as a substitute.
Yesterday we got a 50'' plasma HP PL5060N in store. Customer said they heard a loud pop while watching and the screen went dark.
TV was powering on properly with no picture.
Both the dark image and especially the popping sound is a classic for burned sustain board and naturally that's what I started with.
Z sustain board was shorted (will post separately about it some time) and I replaced it (http://stores.ebay.com/coppelltvrepair/), but surprisingly that didn't fix the problem.
It is unusual for both sustain boards to burn at the same time, but apparently that's what has happened. It wasn't a short on top of that too - it didn't burn a fuse, it didn't short and I couldn't detect it by a quick resistance comparison between key IPM (intelligent power module) pins.
Eventually I decided to take out the IPM (YPPD-J015B was originally on the board) and here is what I found:
This is the sustain board with the YPPD-J015B component taken off. It usually looks much darker underneath burned IPM modules...this was surprisely clean. Pay attention of the little dusty spot at the lower end corner though:

This is an up-close screenshot of the spot:
This is the YPPD-J015B module underneath. Most of the time it is easy to see the burn, but this IPM was covered:

I took the cover off and could finally see it sure has burned. Compare the clear rectangle (this is a diode, actually) at the upper right corner with the darker rectangle in the bottom right.
The bottom has burned, and bad.
2011 UPDATE:
Related article(s):
http://blog.coppelltvrepair.com/2011/10/when-6871qyh039b-fails-should-buffers.html
http://blog.coppelltvrepair.com/2010/02/hp-pl5060n-problem-6870qzc004a.html
http://blog.coppelltvrepair.com/2010/10/vertical-or-horizontal-color-lines-in.html
Related products and services:
50'' LG YSUS BOARD REPAIR SERVICE BY COPPELL TV REPAIR
REPAIR KIT FOR LG 6871QYH039B SUSTAIN BOARD
====================
The 6870QYC004B sustain board is made by LG and used in various 50'' plasma televisions - both LG originals and branded versions like Insignia, HP, Maxent, Sony etc.
The board has several different revisions, possibly according to licensee or technology used or revision...don't know for sure.
Those boards are 6870QYC004A , 6870QYC004B, 6870QYC004C, 6871QYH039A,
6871QYH039B, 6871QYH039C, 6870QYC104A, 6870QYC104B, 6870QYC104C, 6870QYC104D and possibly others.
To the best of my knowledge each of these boards is compatible with others and can be used as a substitute.
Yesterday we got a 50'' plasma HP PL5060N in store. Customer said they heard a loud pop while watching and the screen went dark.
TV was powering on properly with no picture.
Both the dark image and especially the popping sound is a classic for burned sustain board and naturally that's what I started with.
Z sustain board was shorted (will post separately about it some time) and I replaced it (http://stores.ebay.com/coppelltvrepair/), but surprisingly that didn't fix the problem.
It is unusual for both sustain boards to burn at the same time, but apparently that's what has happened. It wasn't a short on top of that too - it didn't burn a fuse, it didn't short and I couldn't detect it by a quick resistance comparison between key IPM (intelligent power module) pins.
Eventually I decided to take out the IPM (YPPD-J015B was originally on the board) and here is what I found:
This is the sustain board with the YPPD-J015B component taken off. It usually looks much darker underneath burned IPM modules...this was surprisely clean. Pay attention of the little dusty spot at the lower end corner though:

This is an up-close screenshot of the spot:
This is the YPPD-J015B module underneath. Most of the time it is easy to see the burn, but this IPM was covered:

I took the cover off and could finally see it sure has burned. Compare the clear rectangle (this is a diode, actually) at the upper right corner with the darker rectangle in the bottom right.
The bottom has burned, and bad.
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