Vizio M370NV Powers on for 2 seconds then shuts down

[Diah]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

this is the mistake you are falling in.
1- i will not go further to explain how script work at cpu or eeprom when it programmed on exact level of currents or Temperature.. you are talking now like they are dummy to make this TV even if there are short contact and got fire. or you may think like i cant see any sensor or parameter to read cpu temperature
2- 3 -- in EU all house hold includeTV should categorized with energy saving.... i don't know about your land.
the last. let see how its end over here and your shopjimmy

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

I will not go further to explain top you eigher since THERE IS NO FEED BACK FROM Power supply/LED driver circuit to communicate with the CPU on the main board, NONE! I am not the only that saying it either.
What reading CPU temperature has to do with the backlights circuit when there is NO feed back from power supply/backlights board to tell the condition of the backlights, may be that is the mistake you are falling in.
Look at the board and tell us with pin on the power supply board is the feedback pin that communicate the condition of the backlights/backlights circuit/ power supply circuit.

"you are talking now like they are dummy to make this TV even if there are short contact and got fire." Yes, they have done that before then and now and in the future. Going through CE, UL, or what ever the safety compliance do not really mean much.
https://www.badcaps.net/forum/showth...ht=LG+47LN5790

[Diah]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

I will not go further to explain top you eigher since THERE IS NO FEED BACK FROM Power supply/LED driver circuit to communicate with the CPU on the main board, NONE! I am not the only that saying it either.
What reading CPU temperature has to do with the backlights circuit when there is NO feed back from power supply/backlights board to tell the condition of the backlights, may be that is the mistake you are falling in.
Look at the board and tell us with pin on the power supply board is the feedback pin that communicate the condition of the backlights/backlights circuit/ power supply circuit.

when you talk on signal goes from PSU to MB mean HW level and here we don't have because the size of the TV maybe or there but blind

but any short of edge LED will effect by increase or dis crease currents on other 12V etc. or whatever.. here the SW level play roll. cpu temperature are an example how this temp read and act .. this is again SW level. and there no NO set TV or other with out SW protection level.. other wise it will not be on market at all. if other join yours idea or not. even the whole user of this forum i will keep explain to correct somethings wrong especially if it related of SW

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

"when you talk on signal goes from PSU to MB mean HW level and here we don't have because the size of the TV maybe or there but blind" Well, finally!This the TV model we are trying to fix, it has NO FEEDBACK to the CPU on the main board to tell the condition of the power supply/LED driver circuit, so no SW protection for the LED circuits for this TV, it saves the company money.

"but any short of edge LED will effect by increase or dis crease currents on other 12V etc. or whatever" Do you really understand what constant current circuit is? BTW, the 12V is used by the main board only, not used by the LED driver circuits, it is generated by rectifier CR120 if you bother to look at the board layout.

BTW, do the experiment on constant current test, get two 100 Ohms resistors and connect them in series then connect them to 100 mA constant current source, you will see that Vdops on each 100 Ohms resistor will 10V (100 Ohms x 0.100A, now short out one of the resistor, you will see that the Vdrops on the non-shorted resistor is still showing 10V, which means the current of 100 mA is still flowing even though one of the resistor is shorted out, simple test to learn about CC.

"and there no NO set TV or other with out SW protection level.. other wise it will not be on market at all. " That is the BEST BS I ever heard. And the SW never fail or get corrupted, right?
Have you ever gone through the product safety compliance test, well, I have many many times. One of the test is to disable ALL the protection, hardware (I.E. bypassing the fuse), or SW monitoring and then introduce the failure such as dead short circuit and the DUT must not catch on fire or explode that can cause injury. I can't tell you how much money we spend on pre-test before we submit the unit to be tested by compliance testing companies, we spend over a million dollars every year on compliance alone.

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

Funny thing is that when I say it is LED issue, you say it is not, we just do not agree on troubleshooting the issue. Live and learn that is why I do not put 'Professional' on my icon, never stop learning.
https://www.badcaps.net/forum/showth...t=77457&page=2

[Diah]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

we spend on pre-test before we submit the unit to be tested by compliance testing companies, we spend over a million dollars every year on compliance alone.

thanks to let me know..this is other subject could be mistake from yours manufacturing side or the department of compliance testing. or could be political influence too.

i wrote before i had never looked on this TV service manual, and will not too.. as you said i do agree with the greed and make money. but land allowed to do this happen in general ..woww .. don't blame or cause other who are never used to face this whom from other region.

back to our fight..lol if Vizio want or not... SW level are present. as its part of CPU infrastructure . i would appreciated if some one had firmware or dump of this set to upload

[CapLeaker]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

Another piss match over a Vizio!

[Diah]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

Funny thing is that when I say it is LED issue, you say it is not, we just do not agree on troubleshooting the issue. Live and learn that is why I do not put 'Professional' on my icon, never stop learning.

are you happy to find professional got wrong ??
professional are kinda of degree and experiences and both i had over 25 years over eu and china include JP, HK and KR. my first name diah as it is and proud of it.

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

"are you happy to find professional got wrong ??" LOL, it is just to show how we go about troubleshooting the problem and come out with difference conclusion. I have over 40 years of professional experience if that is what you want to brag about, and I am still learning every day.

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

Another piss match over a Vizio!

The point is, opening up the panel is the last thing you would want to do, if you crack the screen it then there is no going back if the problem is not in the panel.

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

don't try to touch my personally

answer to geniuses questioner ...

EDGE LED are different from Direct LED... his LED EDGE you want to know more ask i will answer you how they are different

You should have removed this, it is not professional, or make it LOUDER!

[nomoresonys]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

The point is, opening up the panel is the last thing you would want to do, if you crack the screen it then there is no going back if the problem is not in the panel.

EXactly, a good troubleshooter does not jump to conclusions or make extra or unnecessary, sometimes time wasting work, the guy is the first one to say a simple heating of the powerboard is foolish BUT before you check anything else he says strip it down to the backlights. That's very narrow minded and risky for the panel.

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

BTW, Some one did not tell Samsung that they cannot test edge lit LED using forced on method, Samsung needs a good lesson on how to test the TV they design and build, and first thing to do is to open up the panel without making ANY measurement first. If you use LED tester, it will at least show the Vf of each LED string to compare the readings.
Samsung, if you reading BC forum, you may learn something: Post #28, no measurement needed.

Man, resistor test for BL doesn't mean your backlight okay if you see lighting on. take the screen apart and inspect visually you will find the issue.

Post #66:
"I wrote before i had never looked on this TV service manual, and will not too." or even looking at the board to see what are on the connectors.
And how the hell you can have SW protection if it does not have any HW connection to monitor the situation, I and the software guys I work with must have been doing it all wrong.

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

BTW, MisterD, sorry that the thread gets to be this long.
I like to troubleshoot the problem using data from measurement, opening up the panel is the last thing I would do, it does not matter how big or small the screen is because accident will happen then there is no going back, board can be replaced/returned, but new screen is almost impossible and at high price if you can get one.
Would anyone let the doctor opening up your skull without any testing?

[CapLeaker]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

The point is, opening up the panel is the last thing you would want to do, if you crack the screen it then there is no going back if the problem is not in the panel.

I am well aware of that risk budm, been there done that. I was about to write more in my previous post, but then changed my mind. So I am just replying to your last comment to my post. Had a similar run in already a while back and I am just tired of it. Sometimes one can explain all one wants, but on some folks it just doesn't sink in. Anyway... lets just say, I just don't agree with Diah in this thread. Pretty bold statement's... A real professional doesn't act like that. That kinda crap doesn't help the owner of this thread either.

[budm]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

I am well aware of that risk budm, been there done that. I was about to write more in my previous post, but then changed my mind. So I am just replying to your last comment to my post. Had a similar run in already a while back and I am just tired of it. Sometimes one can explain all one wants, but on some folks it just doesn't sink in. Anyway... lets just say, I just don't agree with Diah in this thread. Pretty bold statement's... A real professional doesn't act like that. That kinda crap doesn't help the owner of this thread either.

No problem at all.

[MisterD]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

BTW, MisterD, sorry that the thread gets to be this long.
I like to troubleshoot the problem using data from measurement, opening up the panel is the last thing I would do, it does not matter how big or small the screen is because accident will happen then there is no going back, board can be replaced/returned, but new screen is almost impossible and at high price if you can get one.
Would anyone let the doctor opening up your skull without any testing?

Thanks Bud, I am just reading all of these posts. I have ordered a non tested main board that didn't cost much, as i don't want to put much money into this vizio. I have no intentions of opening up the panel and taking a chance on possible damage. like you said that is the last thing i will do. I will post on here how it went. will be a few days before the main board arrives. as always I appreciate your help with this TV and several others that you have helped me with in the past.

[Diah]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

I sprayed the eeprom U53 with cold spray, waited a few seconds but still had the same problem. the TV Powers on with backlights,has the on screen vizio logo for 2 seconds, then blank white screen for 1 more second, then tv turns itself off

i took back my early statement about BL issue.. blank white screen issue with MB and exact at communication between CPU and NAND. much like BGA or corrupted sectors

[MisterD]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

I was cheap and bought a non tested Main Board. this one does show the Vizio Logo and will not power on the TV. I don't want to put much money into this tv, so now I am debating on buying a replacement eeprom and trying that for this board or not fixing it at all.

[nomoresonys]

Re: Vizio M370NV Powers on for 2 seconds then shuts down

Eeprom n mainboard there, the mainboard does have a make offer option, 45 seems a little high, took a quick look at a few other places and they want even more: https://www.ebay.com/sch/i.html?_fro...acat=0&_sop=15