Vizio M65-E0 No Picture, No Sound

[EazyBone]

RIP M65 Vizio

[lotas]

Hello lotas, When you say "power supply" are you referring to the main power supply or the T-CON board?

No, the power supply for the bar itself comes from the T-con.

[ggil44]

OK, Thanks Lotas. So if I understand you correctly, the T-CON board is faulty supplying the Left Ribbon cable. T-Con boards are "relativity" cheap so it would be better to replace the T-Con board than to try to chase the bad component(s) effecting the Left Ribbon cable power. EazyBone, not quite ready to RIP the M65-E0 but I might wish I had taken your advice later 😉.

[lotas]

No, there is a problem in your panel, try masking the contacts on the cable, you should not lose power from the t-con when connecting the cable, but with the native t-con, the same problem?

[ggil44]

Thanks for the reply. So you are suggesting masking off contacts on the Left Ribbon cable to try to get a picture? Do you have any idea which ones to start with? Regards

[EazyBone]

Just mask 6-10 pins at a time, generally on the left or right side not usually the middle. Yes it's RIP tv because it's panel short is what I'm saying. I don't think you'll ever get a picture.. but can't hurt to try it out. Just slice a strip, plug it in, if it don't work. Unplug tv, move tape, redo. Always make sure power is unplugged when moving the ribbons.

[lotas]

Try to orient yourself from the right, where CLK is and move to the center...

[Diah]

Had to be gone for awhile, voltages on T-CON with each ribbon cable disconnected R disconnected VGL .04v, VGH .73v VGA 0, 0, 0, 0v. L disconnected VGL -10.51v, VGH 30.2v, VGA1, 15.2v, VGA7, 8.1v, VGA8, 6.9V, VGA14, .35v

yours TV will work and have sound with out panel connected.... i wrote before forget VGH VGL or any other related to T-CON.... have sound on the TV first then yours MB PSU are fine.... if you keep suspected panel as other do you will end up to scrap it.

[ggil44]

Ahh, well, I have an update. I decided to check the left buffer strips more closely and so I pulled the left leg support off and discovered the problem. The previous owner, for some unknown reason drilled or did something with the left leg support which completely hid the damage to the far left buffer strip. EasyBone, you may be right RIP. I don't know if the buffer strip is 1 layer of multiple layers. If single layer I might try to rebuild the traces (tedious) but I did disconnect the last ribbon cable to the damaged strip and powered on the TV and got multiple red vertical lines. I am enclosing pictures of what I found. Regards,

[lotas]

Well, that's what I was talking about, that the problem is in the bar, interlayer short circuit.

[ggil44]

Hello Lotas, You are absolutely right. Is there any chance it could be repaired? Clean up, eliminate shorts, solder fine wire to bridge broken traces?

[lotas]

Hello Lotas, You are absolutely right. Is there any chance it could be repaired? Clean up, eliminate shorts, solder fine wire to bridge broken traces?

Yes, you can try, if your eyesight is good, or under a microscope, carefully go through the drimmer, restore the tracks in the opposite direction....
Here the board is multi-layered and the current paths inside the board could be damaged...

[EazyBone]

That's odd, drilled through or something. Unless your just bored, throw it away. Even IF you repaired those, remember it was dropped probably and it's probably broken within the panel also .. but I would love to see that repair if you tried.

[lotas]

No, they didn't drill here, they just drove in a long bolt, and it did its job...

[ggil44]

Thanks for the advice. I will take a long look at it and decide whether to attempt the repair. I'm retired so I have more time than money😄. What concerns me the most is your comment "Here the board is multi-layered and the current paths inside the board could be damaged..." I have magnifiers so I could probably see to solder but it would be like trying to solder a human hair. As I stated earlier, when I tried to power on the TV with the last (damaged) buffer board disconnected, the TV came on without a picture but had a lot of red vertical lines on the screen so even if I do repair the buffer board I'm not sure that would fix it. Regards

[lotas]

Rather, the story was like this: when they removed the legs and, in order not to lose the bolts, they were screwed in without the legs until the end, since the other side could have suffered, but not significantly, look at the other bar.

[ggil44]

lotas, you are right on.👍 I looked at the other end buffer board and just like you said the damage was there only not as bad. I checked voltages at the T-Con now with both ribbon cables connected and the left damaged section of the buffer board disconnected. As follows, VGA, 1= 15.25v, 7= 8.13v, 8=6.97v, 14= .36v. VSSG= -7.95, TDCOM= 8.57, VGH= 30.2, CFCOM= 6.3, AVDD= 16.1, VSSO= -9.5, VCC= 3.2, V12= 12.4. I am enclosing some other pictures, (first one confirms your scenario). Second is the picture of the screen with both ribbon cables connected to the T-Con but the damaged buffer disconnected. Your thoughts? Thanks

[lotas]

Yes, well, what do you think, I wouldn't mess with this repair.

[ggil44]

Thank you all for your help. I think lotas is right but I may mess with it just a little to kill time. If I do and have any luck, I will let you know. Thanks again

[EazyBone]

Some super long bolts. Don't even bother id say. That damage could of shorted everything out and if you got it all connected back together it's still be broken.

I would just look for another TV on marketplace and try and fix that instead!