Vizio E500AR No Power

[Kildar]

Got a Vizio E500AR from the curb (could have been hit by lightning, idk). TV had no power/standby lights illuminating when plugged in. This TV has very few component boards so I feel like it shouldn't be too difficult to fix. I'd like to use this TV as a D&D map supplement.

I ordered this kit:
https://www.ebay.com/itm/VIZIO-E500A...72.m2749.l2649

Replaced both the mainboard + PS board and the respective cabling but to no avail.

I do not get any response (auditory or visual) from the TV when plugging in/attempting to power on.


Readings off PS are all NULL:
1.Ps on-------- 0v
2.GND
3. 3.3VSTB---- 0V
4.GND
5.GND
6.GND
7.12VA ---------0V
8.12VA ---------0V
9.12.VA ---------0V
10.GND
11.LINE OFF ---0V
12.BL_DIM ------0V
13 BL_ON -------0V
14.NC

I have ~120V AC @ the power cable terminal. I also have continuity between all of the ground pins.


At this point I decided to tear the TV down all the way and visually inspect everything. The backlight inverter is pictured here. Each of the lamps has a darkened spot on the end (with the dark spot alternating sides each lamp).


My uneducated guess is that either I received a bad PS board (I doubt), or something besides the MB and PS are causing the issue. I could use a professional's advice/assistance on this one.

Apologies if the pictures aren't linked correctly. First time posting here.

[captainKKK]

Re: Vizio E500AR No Power

Did you check the Power supply fuse. I wouldn't think you have to do a complete tear down until you get the correct voltages on the power supply pins, at least #3.

[DXseekerMO]

Re: Vizio E500AR No Power

Unhook main board from power supply on that connector and re-test the voltages if the fuse tests good.

[Kildar]

Re: Vizio E500AR No Power

They appear fine, yes? How would I test them?

[Kildar]

Re: Vizio E500AR No Power

Unhook main board from power supply on that connector and re-test the voltages.

Will do. I'll report back shortly.

Just to make sure I'm doing this correctly, my MM is set up like this.

[budm]

Re: Vizio E500AR No Power

They appear fine, yes? How would I test them?

What do mean 'They appear fine'?

[DXseekerMO]

Re: Vizio E500AR No Power

Please post clear, focused pictures of the board layout and the individual boards installed in the TV. I don't follow outside links due to the risk.

Check power fuse first before testing any more voltages

EDIT/ADD: You must use the DC scale on the meter, 20V scale will work and you MUST reference chassis ground to take the measurements.

MAKE SURE TV IS UNPLUGGED before testing the power fuse with the meter in ohms resistance mode, across the fuse.

[Kildar]

Re: Vizio E500AR No Power

What do mean 'They appear fine'?

What I mean is I don't know what I'm doing. Testing for continuity between the ends I get continuity on one of the fuses. The same fuse gives a very low resistance reading. I'm assuming the one with no cont is blown. Going to try to get everything put back together and report back with readings (no MB attached).

Thank you for your patience, all.

[DXseekerMO]

Re: Vizio E500AR No Power

What all did you remove from the board, or did you just remove the boards from the TV?

[Kildar]

Re: Vizio E500AR No Power

You know, I have this bad habit of taking things apart that don't need to be. I stripped the TV down to basically every component. Took me longer than I'd like to admit to realize that the lamp connectors butterfly open. I'm putting the LCD back in place right now and then will report back with what I find from the PS readouts.

[Kildar]

Re: Vizio E500AR No Power

Okay, so fuse tested good. (Correct me if I'm wrong that cont + low ohms = serviceable)


With nothing but power connected to PS:
Readouts are still all 0. Continuity is present with all ground pins.

[DXseekerMO]

Re: Vizio E500AR No Power

Test the voltage at the two large brown capacitors near the middle of the board, with the meter in DC mode, range needs to be set to 1000V. Each needs to be tested individually. Positive probe on the plus, negative probe on the minus. What voltage reading do you get?

DO NOT touch anything on the board with your hands, high voltage that can kill you is present. Be very deliberate about the placement of the probes and do not short any of the pins together. The board is marked + and - at the base of the caps. The side of the caps with the gray stripe is negative.

Send a picture of the meter with the range you are using clearly visible

[Kildar]

Re: Vizio E500AR No Power

My meter peaks @ 600V, will that suffice?

They both read 162V

[DXseekerMO]

Re: Vizio E500AR No Power

Post a pic of your meter please

[DXseekerMO]

Re: Vizio E500AR No Power

My meter peaks @ 600V, will that suffice?

They both read 162V

When testing the voltages at the connector are you sure you were using the right setting and ranging on the meter?

[Kildar]

Re: Vizio E500AR No Power

Here you go, you tell me, haha

At the connector, I'm using 20V DC

[DXseekerMO]

Re: Vizio E500AR No Power

lol knew you had the appropriate range setting on the caps because of the voltage reading you supplied.

I meant did you use a lower scale (like 20V) when testing voltage at the connector going to the main board

[Kildar]

Re: Vizio E500AR No Power

Yes, figured 20V was appropriate for those pins.

[budm]

Re: Vizio E500AR No Power

So you do have 162VDC on the hot side to run the always on 3.3V Standby power supply.
What do Voltage do you get now between the 3.3VSTBY pin and GND pin? If you get nothing then that supposedly 'New' power supply board is bad.

[DXseekerMO]

Re: Vizio E500AR No Power

Voltage at the main caps proves the fuse is good and the rectifier diode is working, therefore power should be present to run the stand-by circuit. If you have no stand-by voltage then you will have a TV that appears dead.

Stand-by runs the minimum functions of the TV so commands from the user can be recognized and processed. No stand-by volts = no happy