Vizio VX42L No video and no Sound

[bob333]

The TV will not turn on(No picture or sound). Checked the voltages : +5V OK, No 24 or 12volts. At power plug in, the relays click on , the 24v goes to only 15 v and then falls back to zero. I have no power schematics for this tv.

[Mr Bill]

Re: Vizio VX42L No video and no Sound

The TV will not turn on(No picture or sound). Checked the voltages : +5V OK, No 24 or 12volts. At power plug in, the relays click on , the 24v goes to only 15 v and then falls back to zero. I have no power schematics for this tv.

Does the "vizio" logo go from orange to white and then cannot be turned off unless you pull the plug? If yes then it would indicate the main board. More likely a LDO voltage regulator has failed. I repaired a vizio GV42L that would physically turn on but didn't have sound, picture, or even back lights. 1 adjustable voltage regulators was not outputting 1.8v as needed. Your gonna need to start checking the regulators and see if they are outputting what they should. Post a few pictures of your main board if your unsure what the voltage regulators look like and we can assist you.

[selldoor]

Re: Vizio VX42L No video and no Sound

This set features often on here - have you tried typing VX42L into the search facility and trying any of the stuff in there.
Welcome to the forum-
We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed
https://www.badcaps.net/forum/attach...1&d=1290283049

https://www.badcaps.net/forum/attach...7&d=1280167246

It will be useful if you can say a bit about yourself - skills tools etc.

[tibimakai]

Re: Vizio VX42L No video and no Sound

The two I had it was the inverter chip on the slave board(right).
Check out the chip if it has a blown pin.

[bob333]

Re: Vizio VX42L No video and no Sound

On the main board I found several regulators with no power output. I cannot find a data sheet for U1 the number is 4953GM. Anybody now were I could find one ?