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

I took out the C111 cap and the other one, put them on my ESR Meter. they are 22uf 50v and they are reading 0.6. SO I assume they are good.

[rebelkustoms]

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

When you say both ways I suspect you mean both diodes, not the reading across on diode and then reversing the probes.
You could try replacing C111 and the cap near D3, without the ic's number it's hard to know if the voltages on it are ok. The vcc seems to be ok and the ic should be pulsing the Q1 mosfet which drives the transformer.
You could check if R13 is ok, it is likely a low ohm resistor, .3Ω ~ 1Ω

As far as testing that Diode. I am keeping the Black lead on the center pin and testing each other leg. each leg is reading.277 with the black lead on the center.

R13 is reading .3 I will see if I can get this thick resin off of the IC and try to get a #

[R_J]

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

Yea it is reading .273 both ways

When you say both ways I suspect you mean both diodes, not the reading across on diode and then reversing the probes.
You could try replacing C111 and the cap near D3, without the ic's number it's hard to know if the voltages on it are ok. The vcc seems to be ok and the ic should be pulsing the Q1 mosfet which drives the transformer.
You could check if R13 is ok, it is likely a low ohm resistor, .3Ω ~ 1Ω

[rebelkustoms]

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

Yea it is reading .273 both ways

[R_J]

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

The diode is just two diodes with common anode. just use diode test on the meter. On the top of the board it is marked like a fet but it isn't, so G & S are the anode and the D is the cathode. and it is likely a schottky diode so will read around 0.2xx or 0.3xx
As for the IC, you can use some alcohol to remove the resin, that sometimes works.

[rebelkustoms]

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

Whats the best way to test D201 for a short. Im sorry I dont think I have ever tested one of these. Great time to learn I guess.

[rebelkustoms]

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

sorry I repeated reply

[rebelkustoms]

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

Damn I cant. I took like 10 pictures of it cant make it out. The poured resin over all the ICs and I think it absorbs some of the printing on there.

[R_J]

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

U1 is on the trace side, it is the standby ic. on the other side of D3. Check that D201 dual diode is not shorted

[rebelkustoms]

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

Are you getting any voltage on the +16VS on plug CN201? What about the voltage on D3?
Can you read the number on U1?
The voltage on D106 is jumping around because the ic is likely operating in burst mode.

I am getting jumpy voltage all <1v on bith +16 pins. So No voltage on that.

D3 is 14v

I dont see a U1. is it one of the 3 U2, U102, and U402?

[R_J]

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

Are you getting any voltage on the +16VS on plug CN201? What about the voltage on D3?
Can you read the number on U1?
The voltage on D106 is jumping around because the ic is likely operating in burst mode.

[rebelkustoms]

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

Have you checked the 4 diodes under the heatsink. D1, D2, D7 & D8. They appear to supply power to the set along with the bridge rectifier DB1

I checked these last night, I didnt take them out of circuit but they all are testing around .5.

[rebelkustoms]

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

You have 170vdc across the main cap, now with negative meter probe on cap negative (M10), Check for voltage on R12, on the end sticking out from under the heatsink. If you have 170vdc on R12, (leave negative probe on M10) check the voltage on D106 cathode (white mark on diode)
Also check the voltage on D3 cathode

I have 173V between M10 and R12. M10 to D106 Cathode I get voltage jumping all over, like 3,5,8,9,etc. it never stabilizes.

[R_J]

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

You have 170vdc across the main cap, now with negative meter probe on cap negative (M10), Check for voltage on R12, on the end sticking out from under the heatsink. If you have 170vdc on R12, (leave negative probe on M10) check the voltage on D106 cathode (white mark on diode)
Also check the voltage on D3 cathode

[dick_barton]

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

Have you checked the 4 diodes under the heatsink. D1, D2, D7 & D8. They appear to supply power to the set along with the bridge rectifier DB1

[rebelkustoms]

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

The first thing I would do is remove the power supply from the tv and inspect or resolder the connections on the transformers, they like to develop poor connections and go intermittent.
Also check the solder connections on any of the components mounted to the heat sinks .

I resoldered all 3 transformers, and all the mosfets with heat sinks on the board. still no luck on any of these fixes. i'm getting no stand by light or power to the main set of pins.

[rebelkustoms]

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

You probably already did, maybe check those 2 diodes D102, D106, D103, maybe heat up your electrolytic caps with a hairdryer and see if it wants to start up if it does, you probably have a bad cap or 2 or more, test power cord for continuity. Seems like the caps should be ok tho, they've only been out for 2 years.

checked the diodes, they are all reading within range. just for fun i desoldered that line of caps on the low volt side and tested them with my esr meter and they seem to be ok.

[rebelkustoms]

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

There seems to be a residue of some sort around the large transformer in post #8 poking through the circuit board. Can you see where it has come from?

The residue just seems to be glue residue that seems to be all over the board. not specific to that area.

[dick_barton]

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

There seems to be a residue of some sort around the large transformer in post #8 poking through the circuit board. Can you see where it has come from?

[nomoresonys]

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

You probably already did, maybe check those 2 diodes D102, D106, D103, maybe heat up your electrolytic caps with a hairdryer and see if it wants to start up if it does, you probably have a bad cap or 2 or more, test power cord for continuity. Seems like the caps should be ok tho, they've only been out for 2 years.