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

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.

[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

[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

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

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

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

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

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

[dick_barton]

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

Have you checked the components in the red box

[budm]

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

I am curious, what DCV do you get on c205 if you measure the Voltage right between the two legs of the cap?

[rebelkustoms]

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

I am curious, what DCV do you get on c205 if you measure the Voltage right between the two legs of the cap?

I am not getting any voltage between those legs. Little jumpiness in the MV range but never gets to 1volt.

[budm]

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

D201 still tested OK?
BTW, still no luck trying to read the P/N of the SMPS IC?

[rebelkustoms]

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

D201 still tested OK?
BTW, still no luck trying to read the P/N of the SMPS IC?

D201 is good I believe. D and S pins read 0.259 . D and G pins read the same.

I was finally able to melt the glue or resin or whatever off the U1 IC. Here is a pic of the number and I will post a datasheet that I think belongs to it.

[rebelkustoms]

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

Datasheet



https://cdn.badcaps-static.com/pdfs/...8c3268d871.pdf

[budm]

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

TEA18363 spec.
Use negative leg of the main filter cap (450450VDC rated cap) as the ground ref. for the Hot side circuit, then report the VDC reading of each pin of the IC.
Be real careful since you are working in the hot deadly side of the circuit so do not touch anything with your body or your hands, at least plug this power supply board by itself into the GFCI outlet, no need to have any other boards connected to this power supply board, also do not let the meter probe slip on you.

[rebelkustoms]

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

TEA18363 spec.
Use negative leg of the main filter cap (450450VDC rated cap) as the ground ref. for the Hot side circuit, then report the VDC reading of each pin of the IC.
Be real careful since you are working in the hot deadly side of the circuit so do not touch anything with your body or your hands, at least plug this power supply board by itself into the GFCI outlet, no need to have any other boards connected to this power supply board, also do not let the meter probe slip on you.

Tested a few times here is what I got.

[rebelkustoms]

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

Have you checked the components in the red box

pretty sure I checked that schottky diode and have checked the resistors but I will check again. I am not sure how to test those tiny capacitors?

[budm]

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

Tested a few times here is what I got.

That is strange that you do have more than enough VCC (14V, per spec sheet the Vstart is between 13.4 ~ 16.4V) for the IC to run, and once it is running the Vcc is supplied by the Aux winding of the transformer to keep it running.

But I also do not expect HV pin to be 0V since it is fed through resistor network so it should have Voltage at that pin.
Right now the IC is dead bu that VCC of 14V is coming from some where.
Normally at startup the HV provide the Vcc to startup the IC and once it is running the Vcc is provided by the Aux winding. Something is not making sense right now.
I would check the resistors connected to HV pin 1 to see if they are OK or not, also check the resistance between hot side circuit ground and IC pins.

[rebelkustoms]

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

That is strange that you do have more than enough VCC (14V, per spec sheet the Vstart is between 13.4 ~ 16.4V) for the IC to run, and once it is running the Vcc is supplied by the Aux winding of the transformer to keep it running.

But I also do not expect HV pin to be 0V since it is fed through resistor network so it should have Voltage at that pin.
Right now the IC is dead bu that VCC of 14V is coming from some where.
Normally at startup the HV provide the Vcc to startup the IC and once it is running the Vcc is provided by the Aux winding. Something is not making sense right now.
I would check the resistors connected to HV pin 1 to see if they are OK or not, also check the resistance between hot side circuit ground and IC pins.

Ok you were correct, it didnt make sense. I put the IC back under a microscope and scraped a bunch of that coating off that was originally on the top of the IC and it was on all the pins too so it was insulating the HV pin from reading. It was like liquid resin or hot glue. At any rate I am reading 103V at HV now that it reads.

[rebelkustoms]

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

Just getting back to looking at this one today. Does the presence of voltage at HV pin help in any way here?