Vizio E550i-a0 no turning on

[budm]

Re: Vizio E550i-a0 no turning on

So, I have this same type of TV from my father in law.

It has the same symptoms. Will not turn on, no LED light in the bottom right.

I have replaced the power supply (Have not check voltages).

I have just ordered a main board. Has this been known to fix this problem???

I hope so.

You need to at least check the Voltages at the connector of the power supply that goes to the main board to see what is missing first.

[jdmorgan]

Re: Vizio E550i-a0 no turning on

Thanks!

The voltage readings are as follows:

1-2 (5.2vsb) :5v
3,4,5: gnd
6-7 (12v): 0v.
8(remote on/off): 0v
9(backlight on/off):0v
10(pwm1):0v
11(pwm2):0v
12(pwm3)0v
13(pwm4)0v
14(pwm5):0v

Side 4 pin Connector:
1-4: 0

[CapLeaker]

Re: Vizio E550i-a0 no turning on

If your main board does not send PSon to the PSU, the TV will stay off.

[jdmorgan]

Re: Vizio E550i-a0 no turning on

So, hold off ordering another power supply until my replacement main board arrives?

Sorry, EE, but not sure of the order of operational voltage on this TV.

[budm]

Re: Vizio E550i-a0 no turning on

'8(remote on/off): 0v' The main board is not sending the ON (PS-ON same as remote on/off) command to turn on the rest of the power supply.

[jdmorgan]

Re: Vizio E550i-a0 no turning on

Thanks for the explanation.

I'll post back after Friday when the main board gets here.

[jdmorgan]

Re: Vizio E550i-a0 no turning on

The new main board fixed it.

[CapLeaker]

Re: Vizio E550i-a0 no turning on

sweet!

[Demetric]

Re: Vizio E550i-a0 no turning on

I started with no power.I have replace the power board,and main board.Steel no power.What next????

[budm]

Re: Vizio E550i-a0 no turning on

I started with no power.I have replace the power board,and main board.Steel no power.What next????

Show us good clear pictures of YOUR boards.
Did you do any DCV readings on the connector of the power supply board that goes to the main board to see if it at least has the standby Voltage to run the main board?

[Demetric]

Re: Vizio E550i-a0 no turning on

No. I just replace both boards.

[CapLeaker]

Re: Vizio E550i-a0 no turning on

well, without your pictures and not having any pin outs with corresponding voltages, I don't think we are getting very far.

[gfbjr52]

Re: Vizio E550i-a0 no turning on

I have this same model tv e550i-a0, with what sounds to be a similar issue. I turned on my tv after I got home from work. The backlight lit and I could hear the show that was on. Before purchasing anything, I thought I should ask on here first. I read through this thread and took the requested measurements. All of the voltages on the power supply checked out. I am curious as to what/where I should try to test from here.

[budm]

Re: Vizio E550i-a0 no turning on

I have this same model tv e550i-a0, with what sounds to be a similar issue. I turned on my tv after I got home from work. The backlight lit and I could hear the show that was on. Before purchasing anything, I thought I should ask on here first. I read through this thread and took the requested measurements. All of the voltages on the power supply checked out. I am curious as to what/where I should try to test from here.

Please give us the list of your Voltage readings, so far in this thread we are not getting the correct Voltages of the command signals or the power supply Voltage readings.

[gfbjr52]

Re: Vizio E550i-a0 no turning on

1-2: 5.2v
3,4,5: gnd
6-7 (12v): 11.8v
8(remote on/off): 3.3v
9(backlight on/off): 3.2v
10(pwm1): 3.0v
11(pwm2): 3.0v
12(pwm3): 3.0v
13(pwm4): 3.0v
14(pwm5): 3.0v

all 5 of the led circuits are at 27.5v with leds connected and 37.6v with the cable removed

4 pin
1-2: 0v
3-4: 18.2v

[gfbjr52]

Re: Vizio E550i-a0 no turning on

I also checked the 2 big caps, and they read at 404v. I also have a different board than previously discussed. http://assets.shopjimmy.com/media/ca...0320-top_1.jpg

[jetadm123]

Re: Vizio E550i-a0 no turning on

Since you have a lit backlight, then try checking the mainboard for fuses (if any). Also, check the voltage regulators on the mainboard for proper output.

[gfbjr52]

Re: Vizio E550i-a0 no turning on

So just by chance as I was getting ready to check voltage regulators, I turned it on to see if the screen was doing the same thing. It was not. The left side of the screen booted as normal, the right side was mostly white, but you could see part of the vizio emblem and once it was finished you could see what channel it was on. After it was to the screen that showed there was no input the left side started pulsing from white to a perfect no input screen. The right side never changed.

[gfbjr52]

Re: Vizio E550i-a0 no turning on

Ok. I finally found a burned board. I don't know what the board is called, but it located at the bottom of the tv. It is one of the boards that the ribbon cables run to from the main board.

[CapLeaker]

Re: Vizio E550i-a0 no turning on

pictures???