Vizio e601i-a3e - No Backlight

[6of1]

I have a Vizio e601i-a3e everything works but the backlight. I have sound and picture (visible with flashlight).

I have watched a pile of videos and tested everything. Now I'm wondering if its the LEDs or the power to the LEDs. I just cant find a video that tells me how to test the LED power section of the PowerBoard before I order a new one..

[6of1]

Re: Vizio e601i-a3e - No Backlight

Power board readings:

POWER OFF
1. 3.36
2. 3.43
3. 0.08
4. 0.04
5. -
6. -
7. -
8. 0.08
9. 0.08
10. -
11. -
12. -
13. -
14. -
15. -

POWER ON
1. 3.35
2. 3.41
3. 3.31
4. 12.21
5. -
6. -
7. -
8. 12.20
9. 12.20
10. 3.32
11. 3.27
12. 0.47
13. -
14. 12.21
15. 3.19

[dick_barton]

Re: Vizio e601i-a3e - No Backlight

Can you post a photo of the connector and legend alongside since pins 1 - 15 don't mean an awful lot without it.

[6of1]

Re: Vizio e601i-a3e - No Backlight

[dick_barton]

Re: Vizio e601i-a3e - No Backlight

All the voltages appear to be correct.
BL_ERR appears to be showing a backlight error with the voltage being at 3.32V.
What voltage do you have at the led outputs when you first switch on. It may go high but drop very quickly.

A photo of the led connections and legend would also be useful

Test leds
https://www.youtube.com/watch?v=ihBE...8TwwMjA1MjAxNg

[6of1]

Re: Vizio e601i-a3e - No Backlight

- Attached LED connector pic
- Watched video (dont know how I missed that one)

When I first turn on the tv I get a reading at (VLED1-1+) of 15v - 16v and then it drops to 0 like you said.

I watched the video and tested the pins like shown
LED connector, Connected
all pins = 0.0's

LED connector, NOT Connected
all pins = 0.0's

Is there anything else to try before buying a new power board?

[dick_barton]

Re: Vizio e601i-a3e - No Backlight

Post a sharp picture of the underside of your board so that the IC's can be clearly seen. If you add it as an attachment it makes it easier to zoom in.

[6of1]

Re: Vizio e601i-a3e - No Backlight

[dick_barton]

Re: Vizio e601i-a3e - No Backlight

What is written on top of U302?

Edit
I think the led driver IC of interest may be under the white blob close to U302.

[6of1]

Re: Vizio e601i-a3e - No Backlight

picked the white blob off..

[dick_barton]

Re: Vizio e601i-a3e - No Backlight

That is the LED controller chip. Can you carefully measure the DC voltages at the following pins of the LX27901IC
Pin 1 = VCC
Pin 2 = Enable
Pin 7 = Fault
Pin 16 = VDD

Can you also check D303, D304, D307 & D308 with your meter in diode mode.

[kamlesh1011@yahoo.com]

Re: Vizio e601i-a3e - No Backlight

I've everything same issue, So, How did you fix it?

[dick_barton]

Re: Vizio e601i-a3e - No Backlight

Unfortunately it's not that unusual that the OP never closed the thread with working / not working / replaced?

Post your voltages as per post 6 giving pin number, name and voltage read on pins 1 to 15

[kamlesh1011@yahoo.com]

Re: Vizio e601i-a3e - No Backlight

Thanks,
Power on
1. 3.3
2. 3.41
3. 3.26
4. 12.3
5. 0
6. 0
7. 0
8. 12.3
9. 12.30
10. 3.28
11. 3.26
12. 0.49
13. 0
14. 12.32
15. 3.19

Power off
0.01
0.09
0
0.59
0
0
0
0.55
0.53
0
0
0
0
0.51
0

[kamlesh1011@yahoo.com]

Re: Vizio e601i-a3e - No Backlight

Thanks, I just noticed when I was getting voltage, Red light on Main board was keep getting off, and I have to keep pressing power button to get voltage.
Power on
1. 3.3
2. 3.41
3.3.26
4.12.3
5.0
6.0
7.0
8.12.30
9.12.30
10.3.28
11.3.26
12.0.49
13.0
14.12.32
15.3.19

power off
1.0.0
2.0.09
3.0
4.0.59
5.0
6.0
7.0
8.0.55
9.0.53
10.0
11.0
12.0
13.0
14.51
15.0

[kamlesh1011@yahoo.com]

Re: Vizio e601i-a3e - No Backlight

I did it again , this time red light on main board stayed On. I also checked Diod
d304. 485
d303. 482
d307. 480
d305. 484

[dick_barton]

Re: Vizio e601i-a3e - No Backlight

Pin 1.   3.3V     3.3V
Pin 2    AC_Det    3.41V
Pin 3.   PS_ON     3.26V
Pin 4    12V_AU    12.3V
Pin 5.   GND
Pin 6    GND
Pin 7    GND
Pin 8    12V_REG   12.3V
Pin 9    12V_REG   12.3V
Pin 10   BL_ERR    3.28V
Pin 11   Led_On    3.26V
Pin 12   Led_BR    0.49V
Pin 13   NC
Pin 14   12V T_Con   12.32V
Pin 15   T Con_On   3.19V

The voltages appear to be OK. I'm not sure about BL_ERR (3.28V)

Using a bright light can you see an image on the screen. You may have to angle the light and press the menu button on the remote so as to have an image.

I would next check the voltages at the connector shown in post #6. Put you meter on each terminal and chassis then power up and see how high the voltage rises and report. Repeat for each terminal pin.

[kamlesh1011@yahoo.com]

Re: Vizio e601i-a3e - No Backlight

Using bright light I can see image. I checked voltage at the connector
vled1+ 8.2
0.02
0.0
9.3
8.3
0.01
0.01
7.6

[dick_barton]

Re: Vizio e601i-a3e - No Backlight

Can you check the voltages at LX27901IC as per post #11
And do you have a well focused photo of the power supply board

[kamlesh1011@yahoo.com]

Re: Vizio e601i-a3e - No Backlight

I will take it tonight and post it, I will check voltage as well.