VIZIO VO37LFHDTV10A no backlight

[high-tech]

Hi Guys, this inverter has all the necessary voltages required to turn on. The blue led on the board flashes briefly and no backlight. The fets never get biased and yes the 12 amp 24v fuse is good and I got 24volts on both sides of the fuse. The 5v and the dim adj I think 1.8 or 2.8 I don't remember. So I replaced the fets and the bd9897 control chip and the same thing blue led flashes and no backlight

[budm]

Re: VIZIO VO37LFHDTV10A no backlight

What is the voltage for the BL_ON (ON/OFF, INV_ON)?

[high-tech]

Re: VIZIO VO37LFHDTV10A no backlight

5volts steady the whole time the power is on. there is a little blue surface mount led on the inverter that comes on and shuts off a second later.

[high-tech]

Re: VIZIO VO37LFHDTV10A no backlight

I think Something on the inverter board besides the commonly sold repair kit of 4 fets and a control chip. I just don't know hot to trouble shoot the control circuit on the inverter.

[budm]

Re: VIZIO VO37LFHDTV10A no backlight

It might be cheaper and easier to just get the new board instead of trying to fix the old one down to component level.

[high-tech]

Re: VIZIO VO37LFHDTV10A no backlight

I really want the knowledge, as you say "NEVER STOP LEARNING"

I hate buying boards online ya never know what yer gonna get...

[budm]

Re: VIZIO VO37LFHDTV10A no backlight

To do component level will need diagram. you can first get the spec of the ICs, the pinout of the transformer so you can at least check the high voltage winding resistance of the transformer, the voltages on the ICs. After that is done, then you can trace out the copper traces on the board to see how all the components are connected together and then you can see how it works, I have done it many times and very time consuming.

[retiredcaps]

Re: VIZIO VO37LFHDTV10A no backlight

I really want the knowledge, as you say "NEVER STOP LEARNING"

If you are absolutely 100% genuine about the above, read post #78 carefully and don't waste budm's time.

https://www.badcaps.net/forum/showth...t=25196&page=4

If you are not prepared to follow his instructions exactly, stop now and buy the board.

[budm]

Re: VIZIO VO37LFHDTV10A no backlight

And this one after 181 posts:
https://www.badcaps.net/forum/showth...t=25139&page=8
https://www.badcaps.net/forum/showth...t=25139&page=9

This is how it ended:
https://www.badcaps.net/forum/showth...=25139&page=10

I must gone through more than 10 pages of papers to get it as correct as I can from the pictures. Scale the pictures of both side of the board and print them out and tape the two page on opposite side as if I have the board in front of me, now you understand what I have to do to get the info people need.

[retiredcaps]

Re: VIZIO VO37LFHDTV10A no backlight

And this one after 181 posts:
https://www.badcaps.net/forum/showth...t=25139&page=9

Yeah, that one too, I watched it from afar and got a feeling early on that it would not end well.

I have done my fair share of 100+ even 200+ posts in one thread to help someone. Now, if the OP doesn't even bother to read those posts before asking for help, I move to the next thread.

[budm]

Re: VIZIO VO37LFHDTV10A no backlight

This one is the top of the list:
https://www.badcaps.net/forum/showth...444#post295444

[retiredcaps]

Re: VIZIO VO37LFHDTV10A no backlight

This one is the top of the list:
https://www.badcaps.net/forum/showth...444#post295444

I won't derail this thread anymore so this will be my last post on this, but at one point I wanted to jump in and the OP for a number of reasons.

I still can't believe that an auto tech can't use a multimeter to measure DC V or ohms properly. I mean those two things are the most often used features in car troubleshooting.

I did "lose it" in this thread. It only took 25 posts. Irconically, I got a lot of PMs "supporting" me after post #25. Read it if you want to.

https://www.badcaps.net/forum/showthread.php?t=10968

PS. I miss PlainBill.

[retiredcaps]

Re: VIZIO VO37LFHDTV10A no backlight

I must gone through more than 10 pages of papers to get it as correct as I can from the pictures. Scale the pictures of both side of the board and print them out and tape the two page on opposite side as if I have the board in front of me, now you understand what I have to do to get the info people need.

I hope someone else in the future stumbles upon your work and it helps them out.

[high-tech]

Re: VIZIO VO37LFHDTV10A no backlight

I wish I could get better search results, and I know its my input that sucks. Thanks for the input guys!

HAVE A GREAT DAY

[high-tech]

Re: VIZIO VO37LFHDTV10A no backlight

Where did plainbill go?

[high-tech]

Re: VIZIO VO37LFHDTV10A no backlight

I hope someone else in the future stumbles upon your work and it helps them out.

Where did plain bill go or what happened?

[high-tech]

Re: VIZIO VO37LFHDTV10A no backlight

If you are absolutely 100% genuine about the above, read post #78 carefully and don't waste budm's time.

https://www.badcaps.net/forum/showth...t=25196&page=4

If you are not prepared to follow his instructions exactly, stop now and buy the board.

I see what you mean and you're right. I'm not able to invest the time to follow through, to many other things. I run a small tv repair out of my home and you guys have helped me so much. And when I read other threads I get tremendous amounts of knowledge and it gets problems solved.

If I figure it out I'll postup and document, its all worth its weight in gold this knowledge we seek

[mijatovic86]

Re: VIZIO VO37LFHDTV10A no backlight

So did you ever manage to fix that board ? I have similar problem with similar inverter... replaced 2 mosfets and BD9897FS, still no back light .... The led blinks and nothing.
I have 24V supply...
Mine inverter is 6632l-0506a

[high-tech]

Re: VIZIO VO37LFHDTV10A no backlight

I bought a brand new Inverter and this tv still has no back light. I looked for the service manual and I can't find one to go through voltage readings on the LDO regulators on the main board... Please help