VIZIO TV (Model:VL370M) Display not working

[nomoresonys]

Re: VIZIO TV (Model:VL370M) Display not working

can check the caps meter in diode mode, probe on each end, shorted if continues to beep or reading close to 000, if one reads short remove and check off board, if it's ok off board then something else was making t read short.

[dskall]

Re: VIZIO TV (Model:VL370M) Display not working

C are capacitors. D are the diodes

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Hm I see so it's one of those little metal pieces like C25, C76, C61 or that area around it that's shorted?

[dskall]

Re: VIZIO TV (Model:VL370M) Display not working

I think vgh is created by a voltage doubler circuit. Maybe a shorted diode. I can't read the chip that generates the t-con voltages.

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Yeah I've noticed that too looks like VGH is half of what it should be for a working TCON board. It's interesting to see what you guys do to troubleshoot. I'm curious how come VGH is a problem why is the voltage lower than it should be?

[nomoresonys]

Re: VIZIO TV (Model:VL370M) Display not working

maybe check all the test points and see if there's any differences if you havent already.

Oops my bad, dont know what I was thinking, I must have just wrote down what I read in your post.

[dskall]

Re: VIZIO TV (Model:VL370M) Display not working

Looks like VGH is the problem. Should be 20- 30v.

[nomoresonys]

Re: VIZIO TV (Model:VL370M) Display not working

maybe check all the test points and see if there's any differences if you havent already.

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Hey everyone, So I have good news I've bought a new tcon board and replaced the broken one and now my TV works again! Yay! for educational purposes I'd like to know why the tcon board is broken. I still took down the voltages of broken and working tcon board in the attached pictures. Also another question is the differences in the tcon boards (top is broken and bottom is working) I've noticed is some of the test points are soldered in the working one as opposed to the broken one, would've me possibly soldering made it work? Just some questions I have as I'd like to get more knowledgeable in this. Thank you for the feedback by the way!

[nomoresonys]

Re: VIZIO TV (Model:VL370M) Display not working

Good video there, just be careful what you touch there's DEADLY voltage on the hot side of the powerboard and the inverter, he's checking the voltages in the first part of the video, He is a good teacher, works at a steady pace that even beginners can grasp, consider subscribing and donating: https://www.youtube.com/watch?v=gRDZ...teY5Gw&index=2

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Hi there! Just let me know how we proceed using the multimeter, thank you!

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Yeah I actually have a multimeter

[dskall]

Re: VIZIO TV (Model:VL370M) Display not working

I hope you have a multimeter.

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Um yeah I don’t have a heat gun and don’t know how to do soldering. Sorry if I didn’t mention that before. I was thinking is it possible to replace one of the boards to fix it?

[dskall]

Re: VIZIO TV (Model:VL370M) Display not working

Next I would suggest heating up your mainboard processor. If nothing changes there. It's down to checking voltages. I would start at t-con, first picture. There is VGH,VGL, VCC, VCOM that I see

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

As per instructions , So I reseated the cable between the board and the main board. After that I unplugged both cables at the bottom. Then I unplugged each bottom cable one at a time and turned on the TV. This is what I got. 1st picture is left cable unplugged and 2nd picture is right cable unplugged.

[dskall]

Re: VIZIO TV (Model:VL370M) Display not working

On first picture. Remove and check, reseat cable between that board and mainboard. Unhook two cables on bottom of picture one at a time and check tv picture. Turn off tv each time before you disconnect cable.

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Here's more

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Hi all I'm back and I got some pictures of the circuit boards on the back of the TV. Let me know if you need more pictures

[L3git]

Re: VIZIO TV (Model:VL370M) Display not working

Ah okay, don’t know where to find that cable but I’ll see if I can open up the TV and then I’ll take pictures of the inside. Also that’s good to hear that the panel might be still good, I was afraid the panel is bad.