VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Yea my screw up, glad it didnt damage anything. Still wondering what is stoppinv voltage from gettin all the way to the connector

[budm]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

OK, it is fine and not damaged when the output filter cap was installed backward.

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Sorry, I gave you the wrong designator for the Source pin resistor, it is way under the heatsink, it is R13 which is connected between Source pin of the MOSFET and HOT side circuit ground.
That R12 snubber resistor is fine.

Yes in Circuit R13 is reading 0.3 ohms

[budm]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Sorry, I gave you the wrong designator for the Source pin resistor, it is way under the heatsink, it is R13 which is connected between Source pin of the MOSFET and HOT side circuit ground.
That R12 snubber resistor is fine.

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Is R12 still tested out at < 1 Ohm?
I have a feeling that standby power supply was working but may be measurement error in the beginning.

Here is what R12 reads and the resistor so you can check value. I think its good if I am calculating right.

[budm]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Is R12 still tested out at < 1 Ohm?
I have a feeling that standby power supply was working but may be measurement error in the beginning.

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

So what is the current state of the power supply after the capacitors being replaced. Are any of the dc output voltages correct?

I have new caps in but I am still not getting voltage at the pins of the output connector

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

The reason C205 blew was because it was in backwards. And there WAS voltage (wrong polarity) across that cap for it to blow up.

It was the wrong cap for that spot and it was in backwards too. My rookie mistake, i may have had a beer or four by the time I was soldering it back in. At any rate I put new Nichion caps in.
Double checked them to make sure they were in the right spots and right way. Still no voltage at the pins yet but you are right I must have gotten voltage at least up to that cap for it to blow.

[dick_barton]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

So what is the current state of the power supply after the capacitors being replaced. Are any of the dc output voltages correct?

[R_J]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

The reason C205 blew was because it was in backwards. And there WAS voltage (wrong polarity) across that cap for it to blow up.

[dick_barton]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

C205 appears to go to U201 which may have been damaged when the capacitor vented.
Edit
Ignore since it looks like it's the 0V leg that goes to U201.
I would trace the 16V from the connector CN201 back to the rectifying diodes and see if they were damaged.

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

I found the reason the cap blew, dumb mistake on my part, there are 2 different value caps right in that area and when i took them out to test I accidentally swapped spots, so the cap that blew was in the wrong spot and got damaged. My mistake.

I had to order a new cap so I just spent 5 bucks and got new nichion caps for the C9 and C111 spots and ALL the caps down the connector side of the board. With those in and the Transformers resoldered I am still getting 0V on all the pins. No Standby or anything.

[dick_barton]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

I just soldered in the C9 and C111 caps that I took out and tested with the ESR and I plugged in the board without the load to test the pins and the C205 Cap Failed and popped. For what reason I dont know but here is a photo.

Check that the white line running along the capacitor has its nearest pin connected to the negative pad "-"

[R_J]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Yes I thought the same thing. Was wondering if there was maybe a cold solder joint there and it reconnected when I soldered c9 and c111 back in. But I am not sure why 205 popped. I thought of just recapping all these but not sure if I have another problem or short happening here?

Resolder all the connections on that transformer, you don't need to start replacing a bunch of parts for nothing, this circuit needs to function first, It must be close to working if it blew the cap. They don't blow like this unless there is a voltage on them. If you look at the board you will see that all 3 caps are in parallel , so how did just one blow?

It could be that C9 & C111 are NFG. and the heat from soldering cause them to work, Replace them or re-heat the two caps with the tip of the soldering iron, then try the power supply again.

[nomoresonys]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Probably not but make sure you didn't accidentally put one of the re-soldered caps in backwards.

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Yes I thought the same thing. Was wondering if there was maybe a cold solder joint there and it reconnected when I soldered c9 and c111 back in. But I am not sure why 205 popped. I thought of just recapping all these but not sure if I have another problem or short happening here?

[budm]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

It is strange that you removed and re-installed C9 and C111 which at that point the power supply starts running again but then C205 blew up.

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

Damn, still not getting voltage on any of the pins at CN201 with C205 removed

[R_J]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

I suspect that C205 was bad, as in shorted and that is what was killing the voltage, If it was caused by anything else I suspect C203 & C204 would also have blown. Remove C205 from the circuit and monitor the +16VS voltage on CN201, I suspect the voltage will now be there. The board will operate without C205 installed for testing

The fact the cap blew would suggest there is voltage now getting to it and I bet the power supply is working.

[rebelkustoms]

Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

I just soldered in the C9 and C111 caps that I took out and tested with the ESR and I plugged in the board without the load to test the pins and the C205 Cap Failed and popped. For what reason I dont know but here is a photo.