E500i-b1 piece of **** backlight problem

[freakaftr8]

Okay this one's actually throwing me for a loop. Dual Channel LED strips one on the right one on the left all of them are lighting up no shorts. The mainboard does the processing for the back lights including voltage to the lights and balancing. The power supply provides 24 volt which is actually 15 volt I believe the 24 volt is mislabeled due to other threads on this forum. I have seen other people notice that there's only 15 volts on a good working TV. However back lights come on for a brief second exposing the V for Vizio and then shuts down the backlighting. screen still working and so is audio. Check ed solder connections and all sorts of other circuits. What I found is if I disconnect either side of the LED strips upon power up one side will come on and stay lit at that point I can connect the other side. This is intermittent period sometimes both sides come up no problem in the TV will run all day like this. Almost sounds like a low current condition or a ramp up condition. I'm stumped if this could be a power supply or a main board failure. The power supply seems to providing all voltages upon startup. The dim pin holds steady 1.65 volts DC. Grounding the pin or disconnecting the pin makes no difference. Any ideas?

[freakaftr8]

Re: E500i-b1 piece of **** backlight problem

Okay now I am completely lost the TV's working fine I'm starting to think capacitor issue on a pull-up?

[heavymachines]

Re: E500i-b1 piece of **** backlight problem

Try heat on caps with hairdryer when it don't want to to run? Or freeze on any ic seemingly warm?

[budm]

Re: E500i-b1 piece of **** backlight problem

So now it is working, is it really 15V or 24V?

[freakaftr8]

Re: E500i-b1 piece of **** backlight problem

It's 15v

[budm]

Re: E500i-b1 piece of **** backlight problem

Thanks.

[freakaftr8]

Re: E500i-b1 piece of **** backlight problem

So I thought it was a balancer error but now upon power up the leds turn on and off every .5 seconds. 15v 12v and 5v.hold steady. Thinking of shotgunning caps.

[CapLeaker]

Re: E500i-b1 piece of **** backlight problem

if it is caps, the oscilloscope or a DMM set to AC, should be revealing the bad capacitor.

[ReeceyBurger123]

Re: E500i-b1 piece of **** backlight problem

Ive had Led fail intermittently on some Led Tvs when they wear out. Doubt its caps though too new could probably be a control Ic issue or Led issue as I said.

[capwizard]

Re: E500i-b1 piece of **** backlight problem

Tengo el mismo problema which drive me loco. Hope this might help you.
Sometimes it happens, sometimes it doesn't. Finally, I did fix it by first change IC9301 then IC9101. Estoy muy feliz ahora.
https://www.badcaps.net/forum/showthread.php?t=59376

PS: I hope you guy can understand that I am learning Spanish to make a living.

PS: pic1 That IC fix my problem.

[freakaftr8]

Re: E500i-b1 piece of **** backlight problem

Ok so essentially what you are saying is that from your post this was a problem with your TV? Intermittent LED backlighting? Definitely power supply related huh?

Tengo el mismo problema which drive me loco. Hope this might help you.
Sometimes it happens, sometimes it doesn't. Finally, I did fix it by first change IC9301 then IC9101. Estoy muy feliz ahora.
https://www.badcaps.net/forum/showthread.php?t=59376

PS: I hope you guy can understand that I am learning Spanish to make a living.

PS: pic1 That IC fix my problem.

[capwizard]

Re: E500i-b1 piece of **** backlight problem

I did not have this (Intermittent LED backlighting?) problem because I use LED tester 100% isolated this problem. The TV has intermittent power start up problem. Sometimes TV power does turn on , sometimes it doesn't turn on.

When customer bought me this dog TV, it was cool down so when I tested TV it did work, but after next day the TV warm up is not work. Finally I used hair dryer to point-out the problem and fixed by change FSFR 1700XS PWM IC. I hope this will help you.

"if I disconnect either side of the LED strips upon power up one side will come on and stay lit at that point I can connect the other side. " It caused by the insufficient power current supply (IC9101FSFR 1700XS ). You can try that IC with hair dryer see if TV will work.

[freakaftr8]

Re: E500i-b1 piece of **** backlight problem

Okay so I got into this little deeper and you are right I was getting some strange DC Ripple upon startup. The problem is definitely ic9101 however heat doesn't change this symptom on this TV however extreme freezing of that ic regulator does change it. it Powers up immediately. so as I already had and IC9303 standby regulator I replaced that first. Needless to say I have that regulator on order and we'll see how it works when I get it.

Long story short the excessive DC Ripple current through the 15 volt line is enough to cause the main board to shut down the power supply. This represents itself into different scenarios. The first scenario where the LEDs go out however the TV still works just no backlight. The second scenario is when it fails even further than the 15 volt line comes up and then slowly drops off causing the TV to go into a shutdown state. You have to look real close for the flashlight to see if the screen is still working or not. In my case and Screen did work half the time and then the other half the time it would not.

Thanks guys for your help with this one

[freakaftr8]

Re: E500i-b1 piece of **** backlight problem

Just so you guys know IC9101 fixed the problem

[ReeceyBurger123]

Re: E500i-b1 piece of **** backlight problem

Good job ehy.

[johnboy1313]

Re: E500i-b1 piece of **** backlight problem

Attaboy capwizard. Good job freak.

[freakaftr8]

Re: E500i-b1 piece of **** backlight problem

Not enough thermal paste contact with the heatsink from the factory plus a very small heat sink with an IC that needs to dissipate quite a bit more heat than the sink will allow especially with a very small amount of thermal paste is most likely the cause to this problem

[freakaftr8]

Re: E500i-b1 piece of **** backlight problem

Well I guess I jumped the gun on this one a little bit. It's back in my possession same problem back lights sometimes don't even come on however it does have LCD action plus sound. Sometimes back lights flicker upon startup. Sometimes back lights will come on.

[dick_barton]

Re: E500i-b1 piece of **** backlight problem

Resolder the led driver chip / mosfets and any other component around it and see if that helps. That was the solution to a problem with backlights in a current post on this Forum.

[capwizard]

Re: E500i-b1 piece of **** backlight problem

"Sometimes back lights flicker upon startup. Sometimes back lights will come on."

Thats 2nd problem, Open the screen, U need to change flick LEDS. Now I am working on A E420i-a0, 7 LEDs need to be changed.

PS: E500i-b1 i means VIZIO Internet Apps Plus

Quicker & Smarter; A revamped user interface lets you access the apps you love quicker and more easily.

Built-In Wi-Fi: Ultra-fast Wi-Fi provides an easy clutter-free Internet connection.

Premium App Collection: A newly expanded apps library adds to an already unrivaled selection.

Full-Screen App Launcher: A full-screen app launcher makes finding and organizing your apps a breeze.

PS: This TV use 16G NAND Flash to store all this APP junks and firmware together. (Too big for me try to Dump it. If you have 3rd problem will be this). But this TV is A WiFi Smart TV.