Vizio E320AR Power Supply Board Overheats

[JunkmanJimbo]

Does anyone have any idea why the power supply board keeps overheating to the point that it actually discolors the board and eventually fails on a Vizio E320AR? The power board part number is 56.04119.071. I have replaced the board with a used one that's beginning to do the same thing. The original board was completely dead. The second board worked for awhile but now shows the Vizio logo and then goes into standby and will not respond to anything. I have since moved the board slightly while powering it on and it seems to stay on now, but of course this is temporary. Any help is greatly appreciated.

[budm]

Re: Vizio E320AR Power Supply Board Overheats

We need pictures of the whole backside of the TV showing all the boards so we can see how they are connected together, and good clear straight shot pictures of the top and the bottom side of YOUR power supply board; that will be a starting point.

[JunkmanJimbo]

Re: Vizio E320AR Power Supply Board Overheats

Thanks budm. The pictures I've taken of the power supply board are of the original board. It has swollen caps but the replacement board I installed does not have swollen caps, if that even matters. You can see where it's getting so hot that it has discolored the board. Also notice where the burnt place is between the board and tv. Thanks for your help.

[dick_barton]

Re: Vizio E320AR Power Supply Board Overheats

It appears to be a common problem with power supply boards which have inductors wound on a ferrite core. I think it's caused when the capacitors are failing causing the ripple current to increase.

Make sure the inductor solder joints have not cracked are securely soldered.

[JunkmanJimbo]

Re: Vizio E320AR Power Supply Board Overheats

Thanks for your help dick barton. Do you think a little higher voltage capacitors would do any good?

[dick_barton]

Re: Vizio E320AR Power Supply Board Overheats

I think the problem begins when the capacitors start to fail and not their capacity.
Replace with high temperature, good quality, low ESR capacitors.

[budm]

Re: Vizio E320AR Power Supply Board Overheats

It can due to bad caps on the Backlights driver board which is inside the LCD panel.

[JunkmanJimbo]

Re: Vizio E320AR Power Supply Board Overheats

Thanks budm. The tv has an excellent picture when it's on. In this case, do you feel like those capacitors could still be the issue? Is there anything else you can think of I can check also?

[budm]

Re: Vizio E320AR Power Supply Board Overheats

Yes, if the caps on the backlights driver board are bad then the output caps on the power supply boards will not be able to handle the ripple current for too long. There was a thead at BC regarding to this symptom, the OP keep changing the caps on the power supply board because they keep going bad until I pointed out to him to check or replace the caps on the inverter board to solve the problem.
https://www.badcaps.net/forum/showth...026#post543026

[JunkmanJimbo]

Re: Vizio E320AR Power Supply Board Overheats

Thanks bud, I will definitely check those caps. I will let you know what I find. Thanks again.

[budm]

Re: Vizio E320AR Power Supply Board Overheats

I would at least replace the originals caps in the power supply board with good quality low ESR caps first.

[vizioe320ar]

Re: Vizio E320AR Power Supply Board Overheats

Thanks bud, I will definitely check those caps. I will let you know what I find. Thanks again.

Just checking in to see if you replaced the capacitors? I have the same tv with the same problem. My power supply looks just like yours with dark spots besides the capacitors on the upper left. Those caps are bulging as well. Hope to hear from you!

[JunkmanJimbo]

Re: Vizio E320AR Power Supply Board Overheats

Replacing these capacitors will sometimes fix the problem it seems, but only temporarily. The heat appears to be coming from the transistors on the bottom side of the board opposite the capacitors. I couldn't find a number on these transistors that I could cross to a replacement. So, I just replaced the whole board.

[TVDIYguy]

Re: Vizio E320AR Power Supply Board Overheats

Vizio TV suck in boot up screen when turned on.


Need a little help here... i've been looking for a similar thread but can't find anything.....

I have a Vizio , model number E3DB420VX, and the mother board number is 3642-1462-0150(7b).

After looking and researching on the internet for the last two days it seems that all arrows point to the EEPROM CHIP.. however i can't find the location of the chip and nowhere on the internet is it listed.... question is, IS it on this motherboard or is it integrated like the emachine computers of old.... yes i'm that old. If someone can point out what the location number might be that would be awesome. The only station numbers i have seen that remotely look like eeproms are U2,6,8,10. All others look like something else. I've contacted shopjimmy and anybody else listed and they told me to come here. So here i am. I appreciate all suggestions...

Not trying to hijack but need some helps

[JunkmanJimbo]

Re: Vizio E320AR Power Supply Board Overheats

Can you post pictures of the chips you believe might be the eeprom chips. U2 could be the chip you are looking for. What are the numbers on that chip? I might have one that I can program for you if you can send me the old one.

[TVDIYguy]

Re: Vizio E320AR Power Supply Board Overheats

From what I have seen the EPROMs for this tv are 8 pin and there are a total of like 5... I want to say it's location U2,6,8,10, and maybe 4. I'll look tonight when I get home post some pics with the numbers on the actual chips to see if one of those is the culprit. Is it common for vizios it all tvs to have these issues ? This tv is only three years old. I have a hitachi plasma I bout in 2008 still kickin no problems. On the vizio I've had to replace the ir sensor and this is the second time I've had to open it .

Go panthers .... Get Mcaffrey the ball!!

[TVDIYguy]

Re: Vizio E320AR Power Supply Board Overheats

Ok here are all the 8 prong EPROMs on the motherboard

[TVDIYguy]

Re: Vizio E320AR Power Supply Board Overheats

Ok let's try again

[TVDIYguy]

Re: Vizio E320AR Power Supply Board Overheats

Another

[TVDIYguy]

Re: Vizio E320AR Power Supply Board Overheats

Another