Vizio E65x-C2 question about Gamma

[DXseekerMO]

Hello everyone, I have a shot at this TV and was wondering if anyone else thinks this is potentially a "Gamma Correction Chip" issue, or maybe something similar?

Thanks everyone!

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

Well (gulp) here it is in my living room and what the screen looks like with a picture on it.

WOW that's bright!

What do you all think?

[budm]

Re: Vizio E65x-C2 question about Gamma

How about the pictures of the T-CON board and some Gamma Voltage readings?
What is the history of the TV?
Hard to help with so little details information.

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

How about the pictures of the T-CON board and some Gamma Voltage readings?
What is the history of the TV?
Hard to help with so little details information.

I haven't opened it up yet, so I'll post this pic of the one choice of t-con from ShopJimmy and ask for instruction on test points to obtain gamma voltage readings. I'll check the voltages and post pics of the back of the TV at that time.

Image courtesy of ShopJimmy.com

[budwich]

Re: Vizio E65x-C2 question about Gamma

Hasn't this tv been posted before? If you look at the corners, there is some darkness there plus the panel appears to have "waves" (left side). It appears to have had some led work done on it and maybe some of the layers aren't right.

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

Hi Budwich, I suspect the same thing about LED work and the waviness, diffusion sheets bunched up behind the screen artifact. I searched the forum and found only one other post for this model TV and it wasn't this one.

Still hoping for the test point locations and anticipated voltages to check the gamma chip.

[budwich]

Re: Vizio E65x-C2 question about Gamma

yes I found the other post, different set... same strange wave display. But if the layers aren't back properly, can the display show up like this "white out"?

[budm]

Re: Vizio E65x-C2 question about Gamma

So what is the history of the TV? Someone worked it and took the panel apart?

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

The guy I got it from told me someone had worked on it before he got it. Apparently he wasn't sure of what repairs took place. He said him and his girlfriend were watching it when the screen went the way it looks now and has been this way since. This is all I know of its history.

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

yes I found the other post, different set... same strange wave display. But if the layers aren't back properly, can the display show up like this "white out"?

Can you post a link to this? Thanks budwich!

[budwich]

Re: Vizio E65x-C2 question about Gamma

probably won't help much as the poster didn't go much further based on responses. Its just strange that the display has similar waves.... not necessarily the "white out picture" though.

https://www.badcaps.net/forum/showth...highlight=wave

[Andrew F. Ali]

Re: Vizio E65x-C2 question about Gamma

Maybe that is just the way the Panel failures for these sets show up. To be certain, if it was my personal TV I would try a T-CON Bd to be absolutely certain

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

probably won't help much as the poster didn't go much further based on responses. Its just strange that the display has similar waves.... not necessarily the "white out picture" though.

https://www.badcaps.net/forum/showth...highlight=wave

It does look similar to how my screen appears.

Maybe that is just the way the Panel failures for these sets show up. To be certain, if it was my personal TV I would try a T-CON Bd to be absolutely certain

They are cheap for this TV. I'll be looking at this today, later. Maybe by then I'll have the info I need to check the voltage readings related to gamma. I hope this isn't a failed panel. It's all gamma'd out but the motion of the images on the screen are smooth. Like you said, maybe this is how these panels fail, or will tend to fail as time goes on.

[DXseekerMO]

Board pix

Ok now I know a little more about this TV. First off, its pretty dusty in there, so it looks like its been a while since the back has been off, or whoever worked on it beforehand didn't clean anything. There are witness marks on the main board and trim bezel screws that show it's been apart previously.

It looks like the person I got it from was telling the truth when they said "they don't want to deal with it" and "didn't touch it". None of the dust inside looked like it was recently disturbed.

There are no obvious failures I can see on any of the boards, all of the cables are seated and all the board screws are tight.

Interestingly enough the main board itself is the same board in the Vizio E55-C2 I recently did a cap bypass on. Link: https://www.badcaps.net/forum/showth...ghlight=e55-c2

I'm now ready to test the Gamma voltages.

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

Guys, I don't know how to check the gamma voltage on this board. Does anyone have any service information for this? Thanks

[budm]

Re: Vizio E65x-C2 question about Gamma

U600, U700 look to be for GAMMA BUFFER IC's.
What is the P/N as printed on top of the IC'S?
VG_A*, VG_B* test points look to be for GAMMA Voltages but we cannot tell until we verify the P/N of the IC's.

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

budm, here's the numbers:

U600:

AUO-G1422
1450 89.14
59


U700:

AUO-G1422
1501 98.15
59


Since there are two, is one for the right side of the panel one for the left?

Picture follows

[budm]

Re: Vizio E65x-C2 question about Gamma

So far no luck finding the spec sheet.

[DXseekerMO]

Re: Vizio E65x-C2 question about Gamma

Yeah me neither.

[budwich]

Re: Vizio E65x-C2 question about Gamma

Since you are "thinking gamma", you could just do some "blind measuring" with hopes of seeing some "pattern" on the pins.