Vizio e601i has no backlight

[fixerupper75]

Hello guys,
I have this vizio e601i-a3 it has sound and a faint picture. I assume no backlight. Does the t-con control the backlight or is there a inverter board.

[tom66]

Re: Vizio e601i has no backlight

On modern LED-backlit TVs the backlight driver is on the power supply board or on a separate LED driver board. Usually you can trace wires going into the panel somewhere.

[budm]

Re: Vizio e601i has no backlight

Can we see the pictures of the whole back side of the TV?
If it has one of those HIGH CONTRAST RATIO spec, then the backlights may be also controlled by the T-CON to give the fake HIGH DYNAMIC CONTRAST spec.
But just like other TV with LED backlights, I will not be surprised if the LED has failed.

[fixerupper75]

Re: Vizio e601i has no backlight

I have attach some pic. I am not getting any voltage on led BR. And nothing on the upper left side of the power board.

[budm]

Re: Vizio e601i has no backlight

BR = Brightness Control.
What are the Voltage readings you are getting on ALL 15 pins?
Please list pin number, pin name, then follow by the Voltage reading.
How about the pictures that will show the whole back of the TV?
What DCV do you get at the two legs of the four gray rectangular caps next to the LED string connector?
Check each reading when the TV is first turn on, check one at a time when the TV is first turned on (you will have to turn the TV on 4 times).

[fixerupper75]

Re: Vizio e601i has no backlight

Pin 1 3.3v 3.3v

2. ac det 3.4v

3. ps-on 3.3
4. 12v-au 12.3v
5. gnd
6. gnd
7. gnd
8. 12v reg 12v
9. 12v reg 12v
10 BL-ERR 3.3V
11 LED ON 3.2
12 LED BR 0
13 NC 0
14 12V T-CON 12
15 T-CON ON 3.1

AS for the four grey boxes. The two on the right spike to 24v then 0. and the 2 on the left nothing.

[budm]

Re: Vizio e601i has no backlight

"10 BL-ERR 3.3V" I need to find out some how if normal should be HIGH (3.3V) or LO.
"12 LED BR 0" I expect something there.
"AS for the four grey boxes. The two on the right spike to 24v then 0. and the 2 on the left nothing." I will have to look at the bottom side of the board to see how those caps and the LED strings are connected.
BTW, there are 7 Grey wires attached to the LED connector? The connector has 8 pins but it only has 7 wires, so please tell me which pin is not used.

[budm]

Re: Vizio e601i has no backlight

Please verify that this board matches your board for me.
http://www.shopjimmy.com/vizio-09-60...led-board.htm#

[fixerupper75]

Re: Vizio e601i has no backlight

Yep, it's the same board.

[budm]

Re: Vizio e601i has no backlight

Please verify which pin on the LED connector not used for me. it has 7 wires (I think) but the connector has 8 pins.

[fixerupper75]

Re: Vizio e601i has no backlight

Cn301 is an 8 pin connector and each one is being used

[budm]

Re: Vizio e601i has no backlight

All 8 wires are used? Just want to make sure before I start tracing the board.
I can only see 7 wires in this picture:
https://www.badcaps.net/forum/attach...8&d=1426007696

[fixerupper75]

Re: Vizio e601i has no backlight

Yes there are 8. One far right blends into the background but it's there.

[budm]

Re: Vizio e601i has no backlight

OK, please give me the resistance readings between:
A & B =
C & D =
A & D =
B & C =
B & E =
B & F =
D & E =
D & F =
Please make sure to tell me if the readings show up in OHM, K OHM, or M OHM.

There is also a faster way to find out if the LED string has open LED by using AMP meter in series with the LED string.
Photos provided by ShopJimmy.

[fixerupper75]

Re: Vizio e601i has no backlight

A-B=.385
C-D=.445
A-D=142k
B-C= 142k
B-E=.815
B-F= 142k
D-E=142k
D-F= 70k

[budm]

Re: Vizio e601i has no backlight

OK, that is starting to make sense.
Can you please verify D & F? It should have the same reading as B & E.

[fixerupper75]

Re: Vizio e601i has no backlight

Ok my bad d-f=.865

[budm]

Re: Vizio e601i has no backlight

If I am right, this may explain why you are not getting any Voltages on two of the 4 caps.
D & F is bad.
Ypu may want to re-soder all those pins and test again.

[fixerupper75]

Re: Vizio e601i has no backlight

Re-soder all the pins I tested or just D & F.

[budm]

Re: Vizio e601i has no backlight

OK, no need to, it is OK.
There are 2 grey caps one is connected to pin E another one is connected to pin F, you need to test the capacitance of those two caps.