Vizio E65-E3

[lfhlaw]

I have this nice 65" Vizio E65-E3.
I can see the images using a flashlight, but I checked the LED lights and they are all functional.

I checked voltages on the main board.
The LED volts are at 0 with power on and when I power the TV on, no voltage passes through those at all. No jump in voltage.
Pins 11-15 have the correct voltages.
pins 2-5 do not show any voltages when powering up the TV at all.
None of the Capacitors are blown.

All the other voltages are correct. Via Testing I would assume the LED Driver/ power board is bad.
The other option might be the T-con card.

I have included the main board pic

[nomoresonys]

How bout a picture of the whole back as to see how everything is connected.

[nomoresonys]

If backlights are definitley ok then powerboard is suspect, tcon is most likely fine.

[lfhlaw]

ok I included the total picture of the back of the TV with the boards connected.

[mrtek]

it looks like the main board is driving the LEDs. Could you get a closeup picture of the second connector on the main board on top of the one coming from the power supply?

[lfhlaw]

ok closeup of the main board

[mrtek]

I just noticed that there is no connection between T-CON and TV panel.
I can see the connection from Main board to T-CON but no other connection from T-CON. Is it possible that main board shuts off if that connection is not detected?

[mrtek]

this is what is missing.

[nomoresonys]

Indeed those cables are definitely missing, I didn't even notice lol.

[lfhlaw]

Yea those cables are there. but I just removed the LCD Screen. I did put it back and hooked it up. but still no voltage being passed from pins 2-5 when turning on TV.

As a secondary note. when I did power the TV, I noted that the optical sound port isn't lit. So wondering if it might be a main board fault.

[nomoresonys]

Interesting issue, I'm not familiar with this model. It does seem strange that the optical port isn't lit. The led voltage does come from the powerboard so that still makes me suspect it or a sneaky backlight led issue like one barely marginal led. Maybe one of the pros can help with a powerboard stand alone test to see if the backlights light up. Or at least if the powerboard is putting out the expected voltage.

[Diah]

disconnect the socket on PSU, just plug it in wall... measure V.DC on PIN 1 and PIN 12 only
the idea to run PSu as stand alone... any of Pins 1 or 12 have <=3V , put 1K R between it and pin 13 PS_ON.. now measure all pins with reference GND... of course keep always the socket disconnected

[lfhlaw]

ok I disconnected the socket(assuming you meant the cable between the Main and PSU) and checked pins 1 and 12.
Pin 1 has 0 voltage
pin 12 had 4.22 volts

I'm unfamiliar with what you want me to do here with the "put 1K R between it and pin 13 PS_ON.. now measure all pins with reference GND... of course keep always the socket disconnected".

[Diah]

as the socket disconnected when we feed the PS-ON via 1K R from pins 12, the PSU will turn on and it will provide +16V on other pins... stay now the LED OUT and V SNS.. i think VSNS are the BL-ON.. to turn on the V-OUT circuit.. you can follow the Pins 1 from downside of the PSU.. to see if it related to BL circuit.. if its. we can feed it too via 1KR from PS-ON this time to check if there are V on V-OUT... if this was true, then you have issue of this signal BL on didnt come to PSU... most reasons LED Vault...
lighting LED with LED tester never being enough. because some early TVs BL the LED some will have Zener diode build in in reserve way, this if shorted it the TV LED driver will discover it and will shoutdown all LED... but the tester will pass them as it cant discover the short.. so testing LED at first place should be with DM in diode mode in reserve way to see if there are Zener there or not

[lfhlaw]

well the good..... I'm not an electrician, so as much as Diah is trying to help me, it's a little over my head....but i'm always into learning.
I did purchase a power board and that fixed the back light issue. I was so happy and I didn't quite look at the screen other than to see it lit up.

The Bad, Somewhere along the way. I must have damaged the LCD screen, so now there's a vertical stripe on the left hand side. I tried to reseat the LCD cable strip, but no improvement. I think I know where I faulted the LCD though. I laid it across my dining room table perpendicular and the one side did hang slightly down. I wouldn't have thought that would do it, but I guess it did. So Live and learn.

[nomoresonys]

I don't think it's anything you did, more likely just the usual tab bond issue, check this video: https://www.youtube.com/watch?v=4xozlBulA9U

[nomoresonys]

keep in mind some tvs are harder to deal with when it comes to taking off and putting back the bezels, I don't work with tvs much anymore but some other members can let you know what's going on there. On the particular tv in the video he had to remove the bezel but in many tvs you don't have to remove bezel to access those tab bonds on the driver boards, just depends on tv design.