Vizio VO42L saga, Act 4: Got a picture, but it "stutters"!

[mikew67]

Folks,
I admit it -- I'm just stubborn. I've been working on repairing a "free" 42" Vizio my neighbor gave me for months. You can read back through the first 3 acts, starting with the last: https://www.badcaps.net/forum/showthread.php?t=22606

I'm now on my second replacement T-Con board (part #: 6870C-4200C, picture below) from ShopJimmy (which definitely works better than a used pull I got off eBay). I now get a picture, but it has two issues:

• A big one: the rightmost quarter of the picture is chopped off and replaced by a copy of the third quarter (roughly speaking, see pic below).
• A small one: There's a single pixel horizontal black line at mid-height only(!) on the right half of the screen (through the guy's nose in the pic).

Hmmm... OK, has anyone seen this before? My suspicions include:

• Did I get a bad or wrong T-Con board? My original board is labeled with the part #: 6870C-4200C. The ShopJimmy website specifies a 6871L-4200C board for my TV, the box I got was labeled with this number, too. But the board is actually labeled 6870C like the original! Is it just the 4200C1 portion of the part number that's significant? Go figure...
• Are there firmware settings in the T-Con board that need to be reset? How? (Tried using various resets in the on-screen menu to no avail.)
• Do I have a loose or faulty connector? (The one on bottom of the T-Con board seems quite fragile.)
• Some other part that's bad?

Any suggestions would be appreciated

Mike

[XmouseX]

Re: Vizio VO42L saga, Act 4: Got a picture, but it "stutters"!

I had this problem on a samsung once. It was the ribbon cables that are attached to the lCD panel itself. If you check those connections to see if they are lifted at all, you can sometime fastened them back down with tape, heat or wedge foam in there...If it is not those connections, all I can think is T-Con....

[XmouseX]

Re: Vizio VO42L saga, Act 4: Got a picture, but it "stutters"!

bad connections on the T-con can create a distorted picture also..

[budm]

Re: Vizio VO42L saga, Act 4: Got a picture, but it "stutters"!

You have to watch out on the P/N as printed on the circuits board, the White number like 6870-4200C is the P/N for the blank circuit board BEFORE it is stuffed with parts, the correct P/N for the board you want will be the ASSEMBLY P/N which how the board is stuff with certain parts for certain LCD panel. They can use the same blank board and stuff it with different parts which will become another assembly P/N.
You have to look at the P/N as stamped on that white pad.
See example here: http://www.shopjimmy.com/catalogsear...6870C-4200C%2C
For example: http://www.shopjimmy.com/lg-6871l-4200b-t-con-board.htm
this one the blank board is 6870C-4200C, the assembly P/N is EB122V 4200B1 as Shopjimmy has indicated for what to look for.

[XmouseX]

Re: Vizio VO42L saga, Act 4: Got a picture, but it "stutters"!

budm is totally correct...I have been there before. The same board is used for different applications, but the components are a little different on each...