Vizio VW42L hdtv10a No Picture

[pfgallo]

Re: Vizio VW42L hdtv10a No Picture

Hi

Already checked DCV and they are the same as before. Have the 5 Vdc - Pson on 3.1 vdc and no 12 or 24 vdc.

Wondering what I am missing here.

Got both boards on Ebay -one is from Coppell TV Repair LLC and other Topboardsale.

Both had Good Feedback and Purchase from Coppell before with no issues.

At a loss right now on what to try next.

Any ideas? or know anyone here that may have a New Idea?

Thanks for the help

[budm]

Re: Vizio VW42L hdtv10a No Picture

Disconnect the 24V power cable between the power supply board and the inverter board to see if you will get 12V and 24V.

[pfgallo]

Re: Vizio VW42L hdtv10a No Picture

Yes have 24 Vdc and 12 Vdc to ground

[budm]

Re: Vizio VW42L hdtv10a No Picture

Lets see the pictures of the inverter board.

[pfgallo]

Re: Vizio VW42L hdtv10a No Picture

Think found issues - three of four caps look bulged up.

Can I just replace these or need to look further on these boards.

[budm]

Re: Vizio VW42L hdtv10a No Picture

You have Master/Slave CCFL Lamps drivers setup.
Check those 4 power MOSFETs to see if any one of them has low resistance between S and D pin, if they are OK then you can try new set of caps.

[pfgallo]

Re: Vizio VW42L hdtv10a No Picture

Please give me more details on what I need to test. Can you show me on a picture.

What points. Thanks

[budm]

Re: Vizio VW42L hdtv10a No Picture

See picture. Looking for less than 100 Ohms.

[pfgallo]

Re: Vizio VW42L hdtv10a No Picture

measure all of them

with the board with caps look not so bad - all S to D are in the M ohms range

With the board with the top cap that looks bad I have two that read M ohms and other two - 10.2 ohms and 2. 1 ohms

Issue maybe ?? With why these two read higher??

[budm]

Re: Vizio VW42L hdtv10a No Picture

The four MOSFETs a re setup as the bridge drive configuration, half of the Bridge has two shorted out MOSFETs, you need to remove those two with the low readings and test them off the board.

[pfgallo]

Re: Vizio VW42L hdtv10a No Picture

Ok remove the 2 and 10 ohms ones correct? and test the same way?

Let me know = then will continue tomorrow

thank you for all the help