kdl-40nx723 e double image help please

[wreksta]

DOES ANYONE KNOW WHAT CAUSES THE
double image problem on my 3d tv
I will get a picture

but basicly its like this

all wording and images are doubled

3d display
3d display

3d depth adjustment
3d depth adjustment

that's an example


ive tried updating firmware etc any ideas could this be hardware related

please help

[wreksta]

Re: kdl-40nx723 e double image help please

after removing left side screen ribbon my picture fades away
when I remove my right side ribbon the left side of screen is perfect

if I put both ribbons back im left with double image

[tom66]

Re: kdl-40nx723 e double image help please

That sounds like a bad LCD panel to me. If the image is OK with one ribbon out, it's usually the panel (I can't recall a case where it is not.)

[wreksta]

Re: kdl-40nx723 e double image help please

tom anything else it could be ideas please it just went like this

[budm]

Re: kdl-40nx723 e double image help please

+1 bad panel.

[tom66]

Re: kdl-40nx723 e double image help please

I think it's scrap, sorry :/. You're welcome to try fiddling with the tab bonds of course, but since it just "went" I doubt it'll be fixable.

edit: Now I'm home and I see the picture, I would definitely say panel is bad.

[wreksta]

Re: kdl-40nx723 e double image help please

tom ,bud why do you say this straight away could the connections from tcon to driver board noit be bad I aint checked this yet could be a bad ribbon etc

[kasfamily]

Re: kdl-40nx723 e double image help please

a panel name in the tv ?

[tom66]

Re: kdl-40nx723 e double image help please

tom ,bud why do you say this straight away could the connections from tcon to driver board noit be bad I aint checked this yet could be a bad ribbon etc

Because we've seen it hundreds of times and it is always a bad panel (so far I believe without a single exception.) You could rule out your ribbon problem by swapping the two ribbons over. (Do NOT connect left to right, but just swap the cables on both sides.) However, I doubt they are the fault.

When you unplugged one half, you removed whatever was faulty on one half of the panel that was loading a signal line down. (read: shorting an important signal.) I am not sure what exactly is failing, but it is probably one of the driver ICs on that part of the panel.

Modern LED-LCD TVs have shockingly high rates of panel failure. Next to open-circuit LED (a bloody difficult one to fix!), it seems to be the most common fault (...one of the reasons I prefer fixing plasmas.)

I bet this TV has Samsung (S-LCD) or AU Optronics panel.

[anmol]

Re: kdl-40nx723 e double image help please

a panel name in the tv ?

Here is panel id list.

wreksta wrote,

after removing left side screen ribbon my picture fades away

may be VGH-VGL voltage problem there.

pls. post T-con pic.

Regards

[wreksta]

Re: kdl-40nx723 e double image help please

so there could be hope

[tom66]

Re: kdl-40nx723 e double image help please

I don't know what anmol wants you to test but I'd suggest supplying the T-con picture for them.

I had a "noisy" picture issue caused by VGL fault (T-con), however it was completely different to yours, and mine was the same regardless of the ribbons (noisy picture either way.)

[wreksta]

Re: kdl-40nx723 e double image help please

tom what is this vgl fault any ideas what to test please

[tom66]

Re: kdl-40nx723 e double image help please

It's a voltage on the T-con board, marked by a test point VGL or VOFFE.

Should measure around -5V to -10V (black on chassis, red on test point)

[wreksta]

Re: kdl-40nx723 e double image help please

thanks tom will test now

[wreksta]

Re: kdl-40nx723 e double image help please

Tom vofee test point is 11.7 volts any ideas is there tab bonds down the sides mate

[wreksta]

Re: kdl-40nx723 e double image help please

Is that voltage correct

[tom66]

Re: kdl-40nx723 e double image help please

Is VOFFE negative? Does it change with the ribbons one at a time, or both in? If that is OK, then it rules out a VGL problem on the T-con board (so it probably is not a T-con problem but panel related.)

On these newer panels there usually aren't bonds down the side of the screen, they are now built into the glass (which should be more reliable, time will tell.)

[anmol]

Re: kdl-40nx723 e double image help please

here is tcon pic. and voltage.

pls. check if your tcon board is same as pic.

SM4109

VIN - 12V
HAVDD - 8.25V
VCC33 - 3.3V
VOFFE - minus 7.4V
AVDD - 16.5V
VONE - 28.6V
VCC12 - 1.2V
VCOMG3 - 7V
7V VCOMG2B
INA- - OUTA 6.6V - 6.4V
INB- - OUTB 7V - 6.6V
RST - 3.3V
OUTC - 8.6V

Regards

[wreksta]

Re: kdl-40nx723 e double image help please

hi I cant find half of those voltages
tom can you explain how to do this negatively

running tv as it all cables connected

I get these
havdd - 8.53v
vcc33 - 3.3v
voffe - 11.7v
avdd 17.1v
vone - 30v
vcc11 1.2v
ina 7.3v
outa 7.3v
inb 0.96v
outb 1.0v

from what I can work out here these don't look right to me

help me out I cant seem to find
rst
outc
7 vcomg2b
vin
vcomg3