VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no picture

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

so it seems like all my regulators check out...so what should i check next?

[johnboy1313]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

Can you post a clear pic of the T-CON board?

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

yes why didnt i think of that. coming right up! i just took off the cover and had a look. lots of little ... transistors? i have no idea u tell me what they are please!

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

ok heres the TCON ... what am i looking at here? it takes the RMVB signal and changes it into a TFT or something like that signal for the screen?

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

well im stuck...what can i do to at least determine if its the TCON board or the MAINBOARD?

[johnboy1313]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

Check the fuse circled in the pic.

[budm]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

Check the voltage of that 3-pin regulator, also voltage at the test points, you can see many of them with labels, such as 12VIN, etc.
Try having the white ribbon cables connected one at a time to see what you get.

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

i did the switching of the ribbon cables (turned off and unplugged between) and it made no difference still just the backlit black screen...lemme try those other things. just a minute

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

ok i tested the fuse and it was 0 volts on both sides. powered down, i tested it for continuity and the fuse is good. so its just not getting power flowing through it for some reason. the 3 pin regulator actually is only a 2 pin, the middle pin is not connected to anything and there isnt even a solder trace under it (i still dont understand how those other ones (0851PL) worked even though they werent connected tho)
but measuring the volts on pin 1 i get .09 and pin2 i get zero and on pin 3 i get zero..
what do we know now?

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

i cant seem to locate these "test points" i dont see any markings saying 12vin anywhere...
i could be wrong though...

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

i tested the voltages from the cable connecting the main board to the tcon board .. some were 0 volts and some were around 1.2v to 1.25v both on the connector leaving the mainboard and the connector entering the TCON board. of course, i dont know if these are correct voltages but the TCON board is getting some volts, and then apparently they dont even make it to the front side of the fuse? gotta be a bad TCON board, right?? well...if i knew what those voltages were supposed to be....

[budm]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

OK, if the fuse on the T-CON is not getting 12VDC feeding it, then it means the main board is not sending 12VDC to the fuse.

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

yeah i tested the cable feeding the tcon board and its only putting 1.2 or 1.25 volts on any of the lines. and 0 on some of them (ground?) ... what do i look for on the mainboard that could be causing this?

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

how can i find a schematic or diagram for my board to tell me what volts to expect on each of the 30 pins of that connector? the service manual i found is worthless...

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

ugh ive googled everything i can think of...how can i get this information???

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

markings on the board:

VO32L VO37L Main BD

0171-2272-2634

3637-0492-0150(4A)

11M34594L01244A

CSD 3637-0492-0395

V037 AUO
VB_1016

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

wow this is pretty cheap for the mainboard, if that is what it ends up being... http://www.shopjimmy.com/vizio-3637-...main-board.htm

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

ok ive hit a wall...i cant figure anything else out on my own without just guessing..apparently...ive googled everywhere and i cant seem to find a sure fire way to tell whether its the TCON or the MAINBOARD... or accepting that it is the mainboard, i cant seem to find any in depth information about my board or what voltages to expect on what pins to try to track down whats going wrong on it exactly...
im not giving up just yet but if no one has any ideas of what to test, i might just bite the bullet and order the mainboard replacement.... i really want to FIX something though not just replace it..not just because of the money issue... but because of the learning issue!

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

what about the caps on the mainboard. none of them look bad but ive seen all kinds of people say that they dont have to look bad to actually be bad... is there any useful test i can do with just my multimeter to verify my caps, or do i need to get an ESR meter...or ..what is the most cost effective way to measure capacitance?

[triplefour]

Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

im scared to even poke around cause when the probe slipped trying to measure the voltage regulator, i blew a fuse! can this happen again when im measuring one of the connectors or the pins on a small chip that are so close together?
i have the black probe to a ground... does it matter which ground i use? a screw holding in the power board is the same as a screw holding in the motherboard? or what about the main ground that comes from the middle plug and grounds to the chassi with a screw? is that a good ground to use for everything or does it not matter? see im still foggy on some basic stuff here so i dont wanna mess it up further. i hate to be a bother so ill just um... be patient from now. i think ive thrown out all my questions and if someone can be so kind as to light a torch for me, i can accomplish a lot with a little help! thanks!