Vizio e65-f0 oddity

[EazyBone]

So I turn TV on. TV has no backlight but has picture. I considered LEDs, either way some oddity and I pulled it down to the LEDs and all LEDs light up and aren't dead. So I have it down to LEDs and plugged in and can hit power button (no panel connected) and I get these voltages

connector CN201
pin 1 (18vsb1) = 18v
2 (18vsb1) = 18v
3 (18vsb2) = 18v
4 (18vsb2) = 18v
5 (GND)
6 (GND)
7 (GND)
8 (GND)
9 (ps on/off) = 3.3
10 (bl on/off) = 3.3
11 (NC)
12 (NC)

CN301
1 (vsync) = .017
2 (hsync) = 3.3
3 (mosi) 0
4 (sclk) .057
5 (miso).036
6 (cs) 3.3
7 (GND)
8 (fault) = .044 and fluctuating to .8and drops immediately. Every 1 sec
9 (5v sw) = 4.975
10 (GND)


CN601
1 (v out) = 36v
2 (vout) = 36v
3 (vout) = 36v
4 (nc)
5 (nc)
6 (nc)
7 (led 1) = 5v
8 (led 2) = 5v
9 (led 3) = 5v
10 (led 4) = 5v
11 (led 5) = 5v
12 (led 6) = 5v
13 (nc)

CN602
1 (v out) = 36v
2 (vout) = 36v
3 (vout) = 36v
4 (nc)
5 (led 7) = 5v
6 (led 8) = 5v
9 (led 9) = 5v
7 (led 10) = 5v
8 (led 11) = 5v
9 (led 12) = 5v

Is the fault fluctuating telling us something? I'm using ground as negative for LED voltages, maybe that's wrong. But backlights will NOT turn on.

I need help backlights need to turn on. Any experience with this?

[nomoresonys]

Re: Vizio e65-f0 oddity

Carefully measure the capacitors sitting sideways, a probe on each leg, what do you get it in standby and when powered on.

[EazyBone]

Re: Vizio e65-f0 oddity

Carefully measure the capacitors sitting sideways, a probe on each leg, what do you get it in standby and when powered on.

I did, they read 389v both ways, for some reason I can't get the BL voltage to stay at 36 steady anymore

So I noticed when I disconnect the main board, the one with fault from PB, fault goes to 3.3 and stays steady. When I plug it back in, that's when it goes from nothing, tries to jump up to 3.3 (I assume) and just drops back down. It keeps repeating this cycle continuously.

Anyone know what this fault thing is? Maybe connected to this all?

[EazyBone]

Re: Vizio e65-f0 oddity

I can only assume something odd is coming from the main board telling it not to turn on or something. Thoughts?

[EazyBone]

Re: Vizio e65-f0 oddity

All c76,75,78,77 caps read short.

Would reflow or whatever on main chip handle this you think?

[diif]

Re: Vizio e65-f0 oddity

Short or low resistance ?

[EazyBone]

Re: Vizio e65-f0 oddity

000.1 or 000.2 all sides of each of them are short to ground also. I'm not expert here maybe that's how it's supposed to be

[EazyBone]

Re: Vizio e65-f0 oddity

Does anyone know what this fault thing is? Seems to be potential to the issue? Since it keeps fluctuating

I've tried disconnecting the main board with this pin, and the power board keeps it at 3.3v along with cs

I then pulled just that wire out the harness on pb side and plugged harness back in and it's fluctuating again. Something is sending a signal to it from MB I assume

[EazyBone]

Re: Vizio e65-f0 oddity

No one likes vizios eh lol

[nomoresonys]

Re: Vizio e65-f0 oddity

Well where does that one faulty wire lead to on the mainboard, can you trace it and see what component/s it leads to/thru.

[EazyBone]

Re: Vizio e65-f0 oddity

Well where does that one faulty wire lead to on the mainboard, can you trace it and see what component/s it leads to/thru.

You ask the tough questions lol. I don't know yet lol I'll look and try take pictures. Do those short caps indicate something maybe?

Also Sony, you have 10,000 posts since 2013. That's 3 posts a day, off topic are you a TV repair person or what do you do. I'm a stay at home dad that is just fixing/selling and saving all cash for investment properties. Something to do since I can't go anywhere really

[nomoresonys]

Re: Vizio e65-f0 oddity

Repair or trying to repair all things electronic or mechanical has been a long time hobby for me, not a career, good thing too because I'm too slow to fix things to make much money from it. Specially since prices plunged, I spend about an hour or so per day on it, should prolly switch to music, music is fun, a lot of times this is not.

[EazyBone]

Re: Vizio e65-f0 oddity

Coo coo, ya I love fixing anything no matter what it is. I started with a OLED addition and telling wife I'm buying OLED for every room, bought first OLED for $50 broken. Fixed and started from there. Decided people giving away free "black tvs" and I flip them. I'm probably around 30 fixed so far. Probably 6-10 helped from here. I'm having fun. This Vizio is pissing me off though. Main board or PSU is what I see and I'm thinking main. I'd like to be a little more sure tho. Lights definitely work. Still need problem to find though

[nomoresonys]

Re: Vizio e65-f0 oddity

On those caps reading short, how are you measuring, if you have your neg. probe on ground prolly only one side should show continuity/test as short.

[nomoresonys]

Re: Vizio e65-f0 oddity

Lots of times when several read short it can be the ic closest to it that's the problem.

[EazyBone]

Re: Vizio e65-f0 oddity

On those caps reading short, how are you measuring, if you have your neg. probe on ground prolly only one side should show continuity/test as short.

I measured one side neg one side red. Then I stuck new on a ground screw hole and measure each side. All 4 caps read grounded on both sides

[nomoresonys]

Re: Vizio e65-f0 oddity

Sure seems like a short.

[EazyBone]

Re: Vizio e65-f0 oddity

Sure seems like a short.

I'll have to bust out my short killer, never got it to help yet. We will see soon!

The thing is though, I turn TV on and I get a picture. So I'm skeptical lol, but no BL won't turn on

[nomoresonys]

Re: Vizio e65-f0 oddity

Ok, no backlights then, take the cable CN201 off from powerboard to mainboard on powerboard side and measure those connector
pins again on the powerboard.

[EazyBone]

Re: Vizio e65-f0 oddity

Ok, no backlights then, take the cable CN201 off from powerboard to mainboard on powerboard side and measure those connector
pins again on the powerboard.

Tried that, they all become 3.3v lower. So 14.7, 14.7, none for bl on or PSON. I did check that, all voltages look normal. I'll still look through this motherboard here tonight.