Re: Vizio VW42L HDTV10A no picture or sound

Ok i installed a new main board and it works great now.

I took voltage readings again. the only change is the o/f pin.

5.35 o/f
3.65
11.47
11.47
0
0
0
23.3
23.3
5
5
5

After removing the board i noticed some other fuses that i did not check on the back side. i plan on checking those as well

Thanks for your help.

Re: Vizio VW42L HDTV10A no picture or sound

Ok i will remeasure voltage after i install a new board.

thanks for the help

Re: Vizio VW42L HDTV10A no picture or sound

Ok so i should replace the main board?

Re: Vizio VW42L HDTV10A no picture or sound

After i was done testing the the regulators, i turn the power off via switch. I noticed a very faint ringing noise in the area of the power board. I dont know if this i normal or not.

I however can not detect witch component it is comming from though. sounds like the upper right corner near the transformer

Re: Vizio VW42L HDTV10A no picture or sound

Ok i took the readings of those two regulators.

The first one the yellow circle measured (from left to right)

5.11 3.28 0

the part # is L071 903T63

The second regulator orange circle(left to right) only has two pins

11.45 9.04

part # 17809, This also has other markings at the pin outs. 92 on the left, and 46 on the right.

I checked all the fuses and they all seem to be good in that blue circle as well

Re: Vizio VW42L HDTV10A no picture or sound

The t.v. vizio light comes on as soon as you plug it in (dim white). When pressing the power button it does get brighter, and slowly dims. After pressing the power button again it does go back to the dim light again.

It does seem (from the vizio light) that the t.v. is working normal. but no backlight and no sound.



Ok so i remeasured all readings from the power suppy. I will start from top to bottom.
T.V. off
.543
.4
0
0
0
0
0
...

Re: Vizio VW42L HDTV10A no picture or sound

Ok i was mistaken about the 1st pin. it says o/f. no voltage reading. i attached some pictures. I have got to say i have been searching for a fourm like this for a long time, lots of useful info....

Re: Vizio VW42L HDTV10A no picture or sound

I have a vt420m vizio tv that does not turn on. the vizio light comes on then fades when the power button is pressed. no back light no sound. so i have just read all of this post and i can not seem to find u33 anywhere. my tv is about 1 1/2 years old. i tried testing all power from the power supply, they all had power correct to what it said next to them. exept there is one that says o/f and it does not have power or ground. its the very first pin on the connector (top to bottom) i was wondering if anyone had any idea what could be wrong....