Vizio E550VL

[geraposi]

Hello all, I need some help. My Vizio E550VL Has sound and I beleive a picture dimmly in the background. I need to know the first things to do to check the voltage that fires up the Back light invertor board, The switched Vdc (VBL) and then if it proves to be there what to try next. I have read all of the sticky in the trouble shooting tips on LCD TV's. It helped me a lot but with no diagram for this TV I still need help. Thanks for any help you can give me, geraposi

[budm]

Re: Vizio E550VL

Pictures of the board?

[geraposi]

Re: Vizio E550VL

Hi budm, I just looked at the screen in the dark and with a flashlight shining on the screen there is some movement in the background. I saw the how to, reading a previous post on putting pictures into the forums posts but can't find it. Also which board or boards do I need to put up?

[budm]

Re: Vizio E550VL

So the backlights are not on right now, you can post the pictures of the inverter board and the power supply board.
There are more than one versions of the boards used in this model as you can see here:
http://www.shopjimmy.com/catalogsear...q=Vizio+E550VL
Need to find out what you have at BL_ON (INV_ON) pin and at the 24Vdc output pin.

[geraposi]

Re: Vizio E550VL

Hi budm, I can't see these on the forum yet so if they are inadequate. I will gladly redo with better results. Just say so and I will redo them....geraposi

[geraposi]

Re: Vizio E550VL

Here are better pic's of power board. I see some v pins on the plugs going towar the master and slave boards. Is that the v you were refering to? I am going to look this board over before I reinstall it.

[geraposi]

Re: Vizio E550VL

I reinstalled board and it has the 24vdc, 18vdc, and the 5vdc. I need help finding the BL_on pin (Inv_on pin)... I see 5vsb, on pins 1,2,and 3 of the cn201 connector plug. Could that be it?

[budm]

Re: Vizio E550VL

OK, on the connector of the power supply where you can see the PS_ON pin, there are 3 more pins next to it with label "A", "B" (not used), and "C". So check the DC voltage of those 2 pins when TV is off and when TV is on. I am not sure which one of these 2 pin is the BL_ON, and Dimming, but we just need to find out if the voltage on those 2 pins will toggle or not.

[geraposi]

Re: Vizio E550VL

C pin-off, .1vdc
c p[n- on goes to 2.5vdc untill sound comes on and then drops to .7vdc and holds there.

A pin-off, .1vdc
A pin- on, .2vdc

[geraposi]

Re: Vizio E550VL

Hi budm, did you mean the voltge between the two pins or the voltage to ground? I gave you thr voltage measurment to ground...

[geraposi]

Re: Vizio E550VL

Hi budm, Did I say something to upset you? If so I am sorry. If we are done please let me know. Thanks, geraposi

[budm]

Re: Vizio E550VL

OK, I expect A to be higher than 0.2V, so lets try this: First you need to cut (cut it long enough to be able to splice the wire back together, or if you remove the pin) that wire that feeds the 'A', then use 1K resistor between A and 5V, power up the TV and see what happen.

[geraposi]

Re: Vizio E550VL

I may have goofed up. I turned the tv on with (A) wire cut and no resistor in circuit just the open brown wire to (A).. I had backlight pix and sound but lost remote control function. with 1000 ohm resistor between 5v and (A) remote will no longer turn set on but button on side of tv will and we have pix backlight and sound. The buttons on side of tv seem to be functional.

[budm]

Re: Vizio E550VL

OK, all we care right now is that the power supply and the backlights inverter circuit are working, since you are getting backlights OK, that means the problem is in the main board.
I am not sure at this point if this one of those E series with EEPROM problem or not.

[geraposi]

Re: Vizio E550VL

After further testing with the thousand ohm resistor in the circuit the tv will turn on and off using manual buttons. It has picture and sound using ant./cable input and componet input. All three HDMI inputs are dead. This was the original problem along with picture fading? OR going out? I do think I probably damaged the remote section in some manner when I fired the set up with the (A) wire cut/open. That voltage goes high with no load. I was measuring that the first time I turned the set back on after cutting the (A) wire and I can't be sure but it may have gone to 300v, could that be possible?

[budm]

Re: Vizio E550VL

Cutting that wire does not cause any damge, the highest voltage it can go up to will be only 5V, the max voltage on the main board is 12V (for sound).

[geraposi]

Re: Vizio E550VL

Thanks budm, Well good we have pix and sound no HDMI and no remote. What's the next step?

[geraposi]

Re: Vizio E550VL

Good things happen... We moved the tv so we could see it better and the remote control system started working again. That leaves only what ever is wrong that's causing the problem with the backlight turn on and the three HDMI inputs that are dead...Will it damage the tv to run it with the (A) wire cut and jumped through the 1000 ohm resistor to the 5.0 vdc feed? geraposi

[budm]

Re: Vizio E550VL

You can run with the wire cut if the backlights will stay on, but your main board will more likely to die completely since the HDMI sections already went out, be ready to buy new main board for it, use outlet strip to kill the power to the TV when not in used.

[geraposi]

Re: Vizio E550VL

OK, all we care right now is that the power supply and the backlights inverter circuit are working, since you are getting backlights OK, that means the problem is in the main board.
I am not sure at this point if this one of those E series with EEPROM problem or not.

I think this may be one of the problematic E Series with EEPROM trouble.
our main board is Part # 3655-0162-0150 (3C) The replacement board I see on differant sites is Part # 3655-0162-0395R

I read at www.elektrotanya.com about a repair kit for the main board part # 0171-2272-3253/54 for $18.95 or so. I have no idea what it is but it may be an EEPROM.