Vizio VX37L HDTV10A no picture

[SdlewisSr]

Hello,
I was given a Vizio VX37L HDTV10A that has no picture (not sure about sound - they do not remember if the sound was working when it went bad). When plugged in the VISIO LED on the front lights up orange. When the power button is pushed the VISIO LED turns white. The screen backlight does not come on. Before the power button is pushed, the voltages on connection J1 (Main Board to Power Board) on the Main Board are as follows:
Pin 1 = 0v ("POWRSW")
Pin 2 = 0v ("+12V")
Pin 3 = 0v ("+12V")
Pin 4 = 0v ("+12V")
Pin 5 = 0v ("+12V")
Pin 6 = 0v ("GND")
Pin 7 = 0v ("GND")
Pin 8 = 0v ("GND")
Pin 9 = +5v ("+5V")
Pin 10 = +5v ("+5V")
Pin 11 = +5v ("+5V")
Pin 12 = 0v ("PWM")
Pin 13 = 0v ("BL ON/OFF")

After the power button is pushed, the voltages on connection J1 (Main Board to Power Board) on the Main Board are as follows:
Pin 1 = +3.6v ("POWRSW")
Pin 2 = +12v ("+12V")
Pin 3 = +12v ("+12V")
Pin 4 = +12v ("+12V")
Pin 5 = +12v ("+12V")
Pin 6 = 0v ("GND")
Pin 7 = 0v ("GND")
Pin 8 = 0v ("GND")
Pin 9 = +5v ("+5V")
Pin 10 = +5v ("+5V")
Pin 11 = +5v ("+5V")
Pin 12 = +3.6v ("PWM")
Pin 13 = 0v ("BL ON/OFF")

All the voltages are what they should be, except for Pin 13 ("BL ON/OFF"). I was wondering if anyone had any suggestions as to where to check next.
Thanks in advance for your help.

[budm]

Re: Vizio VX37L HDTV10A no picture

'Pin 13 = 0v ("BL ON/OFF")' The main board is not sending the command ON signal to turn on the backlights circuit.
Start searching Badcaps thread for 'Vizio VX37L HDTV10A'.
Read how to test Voltage regulators on the main board.

[SdlewisSr]

Re: Vizio VX37L HDTV10A no picture

Thanks budm

[cliff_hootarski]

Re: Vizio VX37L HDTV10A no picture

Check the two fuses on the main board. (top right center)
If they are good, check voltages on the fuses with TV "on".
Then on to the voltage regulators.

[SdlewisSr]

Re: Vizio VX37L HDTV10A no picture

Thanks cliff_hootarski
Will check them.

[SdlewisSr]

Re: Vizio VX37L HDTV10A no picture

F1 & F2 are good

U3 12.4v 0v 5.2v

U4 5.2v 3.3v 2v

U2 5.2v 3.3v 2v

U8 5.2v 3.3v 2v

U33 5.2v 3.3v 2v

U7 3.3v 1.1v 0v

U9 3.3v 1.5v 0v

[budm]

Re: Vizio VX37L HDTV10A no picture

'U7 3.3v 1.1v 0v' That is bad, min output of 1117 is 1.25V, it cannot be less than the Reference Voltage which is 1.25V.
Numbers as printed on the U7?

[SdlewisSr]

Re: Vizio VX37L HDTV10A no picture

That's what I was thinking, but was not sure.
Thanks for your quick help.
Have a blessed day

[dick_barton]

Re: Vizio VX37L HDTV10A no picture

Vizio
ftp://helpedia.com/pub/temp/datashee...DTV10A_extra2_[SM].pdf

[SdlewisSr]

Re: Vizio VX37L HDTV10A no picture

Thanks dick_barton,
I was able to view the Voltages.JPG but not the pdf. I got the following error when I clicked on it.
550 CWD failed. "/pub/temp/datashee...DTV10A_extra2_[SM].pdf": directory not found

[dick_barton]

Re: Vizio VX37L HDTV10A no picture

Hopefully this is a link.
ftp://helpedia.com/pub/temp/datasheets/monitors/Vizio/

[SdlewisSr]

Re: Vizio VX37L HDTV10A no picture

Thanks dick_barton
That link worked.
Have a blessed day

[SdlewisSr]

Re: Vizio VX37L HDTV10A no picture

Thanks for the links dick_barton.
However, that jpg and pdf are not for my VX37L HDTV10A.
My main board does not have a J7 connection.

[budm]

Re: Vizio VX37L HDTV10A no picture

There are more than one version of that model you have.
http://www.shopjimmy.com/catalogsear...?q=Vizio+VX37L

[dick_barton]

Re: Vizio VX37L HDTV10A no picture

There are several references to the VX37LHDTV10A on the website so you may have to look through them to see if one matches your set.

[SdlewisSr]

Re: Vizio VX37L HDTV10A no picture

I just want to thank everyone for your input/help. I replaced U7 and it fixed the problem. The TV is working great
Have a very blessed day/evening/night

[budm]

Re: Vizio VX37L HDTV10A no picture

Thanks for the follow-up.