VIZIO E550VL No Backlight

[CraigR]

I have a old Vizio E550VL with no backlight. I do have a picture when I use a light up to the screen. The fuses on the inverter boards are ok and I have 24volts at those fuses when turned on. Not sure on the next step.

[budm]

Re: VIZIO E550VL No Backlight

Next step is to check and find out if you have 24VDC at both ends of the SMD fuse on the inverter boards with ref to the chassis GND or not.
If you do, the you will need to find out if you have BL-ON signal to the inverter board or not.

[CraigR]

Re: VIZIO E550VL No Backlight

I do have 24v. However not seeing anyplace marked bl_on or I'm blind. I did see one marked ON/OFF on inverter and that only has .5v

[budm]

Re: VIZIO E550VL No Backlight

I do have 24v. However not seeing anyplace marked bl_on or I'm blind. I did see one marked ON/OFF on inverter and that only has .5v

ON/OFF on the inverter board is the same as BL-ON or INVR-ON.
IF all you get is 0.50VDC when the TV is turned on then the main board is not sending the ON/OFF (BL-ON) to turn on the Backlights circuit.

[CraigR]

Re: VIZIO E550VL No Backlight

Well ordered and tried a kit from Shopjimmy. http://www.shopjimmy.com/vizio-3655-...for-e550vl.htm
But did not help at all.

[dick_barton]

Re: VIZIO E550VL No Backlight

Well ordered and tried a kit from Shopjimmy. http://www.shopjimmy.com/vizio-3655-...for-e550vl.htm
But did not help at all.

But were you getting the backlight on voltage as Budm advised because as he said it is provided by the main board?

[CraigR]

Re: VIZIO E550VL No Backlight

Still only .5v after chips change.

[CraigR]

Re: VIZIO E550VL No Backlight

Replaced the main board and is working again.