Vizio E550i-a0 no turning on

[Louis82]

Hello. I have a Vizio TV model E550i-A0 that went off and is not turning back on. White light at corner responds when pushing power button and stays on for 2 seconds then blinks once and stays for another 2 sec and goes off and basically it continues doing that.

There is not backlight, no sound. Testing voltages on power supply I get:
1-2 :5v
3,4,5: gnd
6-7: 0v. Board indicates 12v but there is none.
8: 3.2v
9:0v
10:1.6v
11,12,13,14: 0v

Replaced the main board as they are well known for having eprom issues but I still have same exact problem.

At this point I would like to get your input on if you guys think I have a bad power supply board or a bad screen.

On the power supply/ led connector I get 0v on all pins

Thank you.

[Louis82]

Re: Vizio E550i-a0 no turning on

Picture of power board

[Louis82]

Re: Vizio E550i-a0 no turning on

Any suggestions?

[budm]

Re: Vizio E550i-a0 no turning on

Please put the pin names for each pin to make it easier to know what signals are missing.
Right now there is no Backlights ON/OFF (BL-ON) pin 9 signal from the main board to turn on the backlights. PS-ON pin 8 is fine.
The switched 12V is not working.
Is this the same exact board as yours? I need to know for sure before I start tracing the bottom side of the board. FSP196-3PSZ01
http://www.shopjimmy.com/vizio-0500-...pply-unit.htm#

Pictures are provided by Shopjimmy.
BTW, what country are you in?

[Louis82]

Re: Vizio E550i-a0 no turning on

Thank you for responding budm. I live in USA.
That is the exact same board.

Here pin names:
1-2 (5.2vsb) :5v
3,4,5: gnd
6-7 (12v): 0v. Board indicates 12v but there is none.
8(remote on/off): 3.2v
9(backlight on/off):goes up to 3.2v when push power button then drops to 0v
10(pwm1):1.6v
11(pwm2):0v
12(pwm3)0v
13(pwm4)0v
14(pwm5): 0v

[budm]

Re: Vizio E550i-a0 no turning on

OK good, I will have to trace the board to see why the 12V is not present, other signals/Voltages are fine.

[budm]

Re: Vizio E550i-a0 no turning on

Please measure the DCV between the two legs of the main filter cap (big 450VDC cap laying on its side) to make sure we do have >360VDC when TV is turned on, be careful not to touch anything with your hands since we are working in the Hot deadly side of the circuit.
The boosted Voltage is generated by the PFC Voltage booster circuit, the LED backlights & switched 12V need the boosted Voltage to work.
MOSFET Q150, 151 drive the power transformer T150, one of the winding is for generating the 12VDC using diodes D215, 215, the other transformer winding is used for the LED backlghts driver circuit.

[Louis82]

Re: Vizio E550i-a0 no turning on

The big cap measures 170v

[budm]

Re: Vizio E550i-a0 no turning on

It should jump up to >360VDC when the power switch is activated and the main board sends out the PS-ON to turn on the power supply. If you only see 170V when the TV is turned on, then we will need to find out why the PFC Voltage booster is not working next.

[Louis82]

Re: Vizio E550i-a0 no turning on

Using the limited skills i have, i still can't figure what the problem could be. I found a power board for $15 free shipping on paylesscomponents. Would you recommend any other test to be sure that problem is not main board or panel ?
Thank you

[budm]

Re: Vizio E550i-a0 no turning on

If your Voltage reporting is correct which indicating that you do have PS-on but no boosted Voltage, then we know you have bad power supply board. Main board I am not sure until you have good power supply board first.
You may have bad PFC diodes, you need to check D120A, D120B, D121A, and D121B. It can also be bad PFC Controller IC, bad cap the VCC for the PFC IC,etc.

[Louis82]

Re: Vizio E550i-a0 no turning on

UPDATE: Received and installed new power supply board and tv is forking fine. Thank you budm for your time and sugestions.

[budm]

Re: Vizio E550i-a0 no turning on

Great, thanks for the follow-up.
What are you going to do with the old board?

[Louis82]

Re: Vizio E550i-a0 no turning on

Nothing really. I still have it. If you want it, message me. I can ship it to you.

[budm]

Re: Vizio E550i-a0 no turning on

That will be great for sending me the old board.
I will start requesting the old boards so I do not have to rely on the pictures to troubleshoot the problem, it will be so much easier for me to trace out the board when I have the real board in front of me. This will be a great help for other people at BADCAPS.NET.
I sent you PM.

[lpollock]

Re: Vizio E550i-a0 no turning on

I also have a Vizio E550i-A0 that will not power on. I obtained the same test meter readings as louis in the previous posts. I ordered a new power board and installed it today. TV does not power on at all.

Any suggestions on what to check next?

I don't really want to keep throwing parts at it until its fixed.

Is there anywhere to obtain Vizio test information for this specific model? ie pin 1= x V, etc. I have thoroughly examined both sides of all boards for any evident popped caps, etc and find nothing.

[budm]

Re: Vizio E550i-a0 no turning on

Where did you get the power supply board from?
https://www.badcaps.net/forum/showpo...14&postcount=5
Do you get EXACT same readings of all the pins?

[newtothis]

Re: Vizio E550i-a0 no turning on

If you had exactly the same reading including no >360VDC at the PFC cap then you have another defective PSU

[Louis82]

Re: Vizio E550i-a0 no turning on

@Ipollock Message me if you think you need the main board. I have one, part number 3655-0642-0150(3). I bought it thinking that it would fix my problem. It works. I tested using the tv that I got fixed here with Budm help.

Just make sure that the main board is what you need. Follow the thread and the suggestions from everyone here at Badcaps.

[jdmorgan]

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.