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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

in Troubleshooting TVs and Video Sources

06-01-2016, 04:35 PM
Re: Westinghouse VR-4085DF wont power on & no lights

Hello everyone !
Thanks for all your help !
I found a power supply board for like $42 w/ shipping.
It came today and after installing it I now have a working TV again.
I may look around for the power mosfet and replace it and the fuse to see if it fixes the bad one or I may just hang onto it for parts.
Thanks again everyone for your help !

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-29-2016, 05:53 PM
Re: Westinghouse VR-4085DF wont power on & no lights

I think the Mosfet circled in Blue was the bad one....

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-29-2016, 05:32 PM
Re: Westinghouse VR-4085DF wont power on & no lights

I realized after I removed them to test I mixed them up so I wasn't sure which was actually bad but I think it was the one closer to the diode....

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-29-2016, 04:00 PM
Re: Westinghouse VR-4085DF wont power on & no lights

I did scrape it but I don't have a strong enough magnifying glass.
It looks like L6562a...

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-29-2016, 03:33 PM
Re: Westinghouse VR-4085DF wont power on & no lights

ok this is the best photo I can get of that chip
There is shellac or something on it so its hard to get a clear shot.
I think its upside down, I am not sure

OK it looks like L6562A 7/EZ012...

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Last edited by hackerjoe; 05-29-2016, 03:46 PM.
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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

in Troubleshooting TVs and Video Sources

05-28-2016, 02:42 PM
Re: Westinghouse VR-4085DF wont power on & no lights

Ok the bridge rectifier passes that test you sent me on youtube
So it looks like definitely a bad mosfets so far
Now to find a cheap one and try it along with a fuse....

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-28-2016, 02:35 PM
Re: Westinghouse VR-4085DF wont power on & no lights

Of the board mosfet
a) black on pin 1- red on pin 2 - 120
b) black on pin 1- red on pin 3 - 120
c) black on pin 2- red on pin 3 - 002
Mosfet I think is good on board test
all 3 test are open no readings - off the board I passed quick and dirty YouTube Test...

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Last edited by hackerjoe; 05-28-2016, 02:36 PM.
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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-28-2016, 02:20 PM
Re: Westinghouse VR-4085DF wont power on & no lights

No I haven't I have to google how to test one.
That's the last one on the heatsink correct ?
Removing it from the board to test it and will post results....

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Last edited by hackerjoe; 05-28-2016, 02:26 PM.
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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-28-2016, 02:11 PM
Re: Westinghouse VR-4085DF wont power on & no lights

You're correct !
I removed the diode from the board and the diode tested ok.
Nothing one way and continuity the other.
I removed the 2 mosfets Q4, Q1 and one of them is bad it didn't pass the test I found a quick and dirty mosfets test on YouTube.
Could 1 bad mosfets be causing the fuse to blow ?...

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-28-2016, 09:25 AM
Re: Westinghouse VR-4085DF wont power on & no lights

When I first checked the Power supply for input power I did find it and even went as far as cutting of the heat shrink off it.
I didn't know what it was and therefore I didn't know to test for continuity across it.
I don't have much experience with electronic components other than say resistors and some capacitors.
I do my best to figure stuff out then turn to YouTube then forums if I cant find any info on YouTube.
I greatly appreciate everyone's help here.
I did google testing mosfets...

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Last edited by hackerjoe; 05-28-2016, 10:53 AM.
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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-27-2016, 09:40 PM
Re: Westinghouse VR-4085DF wont power on & no lights

I found some 5amp 250volt glass fuses in my toolbox and swapped out the bad fuse and it popped instantly.
The power supply board had nothing connected to it just power in.
So like you said there is definitely something shorted...
I suspect mosfets are the cause.....
Q4, Q1 and is D3 one as well?

Do the power mosfets have to be removed from the board to test them ?
Also at this point is just easier to try and find a power supply ?
I hate to dump $50 or more in a tv...

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Last edited by hackerjoe; 05-27-2016, 10:07 PM.
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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

in Troubleshooting TVs and Video Sources

05-27-2016, 06:21 PM
Re: Westinghouse VR-4085DF wont power on & no lights

ok if its just a fuse could I use one of these to see if the power supply comes back to life ????
Would you keep it 5amp or go a bit higher ?

RadioShack 5.0A 250V Fast-Acting 1¼x¼" Glass Fuse (4-Pack) or this
RadioShack 5.0A 250V 5x20mm Slow-Blow Glass Fuse

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Last edited by hackerjoe; 05-27-2016, 06:26 PM.
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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

in Troubleshooting TVs and Video Sources

05-27-2016, 05:57 PM
Re: Westinghouse VR-4085DF wont power on & no lights

Ok yup that's the one with no continuity.
Ebay has 5 of them for like $5.50 Est Delivery is June 7
Is there something I can use to jump it to test ????
Thank you for helping with this

The million dollar question is what could have caused it to blow ?

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

in Troubleshooting TVs and Video Sources

05-27-2016, 05:23 PM
Re: Westinghouse VR-4085DF wont power on & no lights

If its short redish/brown I have no continuity ( L side of white Connector )
If its Green and stands up I have continuity ( N side of white connector )

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-27-2016, 05:03 PM
Re: Westinghouse VR-4085DF wont power on & no lights

No Voltage at C7 across the big Cap.

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-27-2016, 04:47 PM
Re: Westinghouse VR-4085DF wont power on & no lights

Ok I'm not getting any Voltage to pin side of the board.
No 5V, and I'm guessing its 5v DC...

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

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05-27-2016, 12:04 PM
Re: Westinghouse VR-4085DF wont power on & no lights

I saw that but it's not in stock anyway, just my luck.
I will check the voltage later on thank you

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

in Troubleshooting TVs and Video Sources

05-27-2016, 10:57 AM
Re: Westinghouse VR-4085DF wont power on & no lights

I will have to test it when I get home sorry I am at work at the moment.
Is there a way to jump the 5volt circuit if there is none even just to test?

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

in Troubleshooting TVs and Video Sources

05-27-2016, 10:35 AM
Re: Westinghouse VR-4085DF wont power on & no lights

Ok I just noticed something in the photo of the back of the power supply with the bigger of the 2, I guess transistors or rectifier or whatever they are.
The bigger of the 2 look blown if you zoom all the way in it looks to be cracked.
It looks to be the 5 volt circuit ( the chip is right below QS1 )
If that is blown how do I test it and what must I get to replace it.
I looks to be glued to the board as well

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hackerjoe replied to Westinghouse VR-4085DF wont power on & no lights

in Troubleshooting TVs and Video Sources

05-27-2016, 09:54 AM
Re: Westinghouse VR-4085DF wont power on & no lights

I posted pics of the tv and boards on it.
I looked around for a Power Supply board but can't seem to find any inexpensive ones.
Is there anyone that could refurb mine assuming its bad ?
Thanks,

Joe...

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