While watching my Vizio VO420E last week, the screen went black on me. I still have Audio, and the Vizio logo goes from Amber to White when turned on, but the screen is pitch black. I was originally told it was the Power Supply over the phone by Vizio. I purchased a new Power Supply (Model # 0500-0412-0750) and put it in yesterday. When I turned the TV back on, I had a picture for about 5 seconds before the screen went black again, so I'm assuming the Power Supply was not the problem. I have done some research and a few people have told me it is the Backlight Inverter, but upon further inspection I've read that this Model does not have a Backlight Inverter, so I'm at a loss. I have a Dish Network Receiver & Playstation 3 hooked up via HDMI cables. Thanks in advance for any help, I'm clueless right now...
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Re: Vizio VO420E Black Screen, HELP!
Just wanted to give an update. I just took the cover back off and tried again, it did the same thing as noted in my original post. I did notice that after turning the power on, I heard a click from the Power Supply, followed by a bright blue LED that only stayed on for 3-4 seconds before going off. -
Re: Vizio VO420E Black Screen, HELP!
Can you post some pictures of inside of your TV?
It is possible you had bad CCFL (fluorescent) tube if this does not use discrete inverter and drives all the tubes from the power supply. Would be rare for a Vizio though.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Vizio VO420E Black Screen, HELP!
Sorry if the picture isn't great, had to use my phone. The board on the left is the one I replaced Friday to no avail.Attached FilesComment
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Re: Vizio VO420E Black Screen, HELP!
You have power supply-inverter combo board, so, like TOM said, you may have lamps problem.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Vizio VO420E Black Screen, HELP!
Thanks guys. Where exactly are the lamps located? And how could I check to see if they've gone bad? I called the only local repair place we have around here after putting the new board in, they gave me a flat rate of $ 328 to fix the TV so I'm really hoping to get this thing fixed myself, otherwise I'd be better off just purchasing a new TV.Comment
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Re: Vizio VO420E Black Screen, HELP!
The lamps are physically inside the LCD panel. This video shows the replacement inside a Sony, but the procedure is similar for any TV.
https://www.youtube.com/watch?v=8oZn...=results_videoPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Vizio VO420E Black Screen, HELP!
I found this picture while searching on here earlier. This looks identical to my old Power Supply, it had burn marks in the same spot, so I replaced the Power Supply but the new one is doing the same thing, but it isn't burnt up. This is a picture I stole from another thread on here, but as I said, the Power Supply I removed from my TV Friday looks identical to this one, burn marks and all. This poster said he had the same problem as I am having, so he just replaced the caps for the CCFL and his worked perfectly, I replaced the entire board so why isn't mine working?Attached FilesComment
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Re: Vizio VO420E Black Screen, HELP!
That bad ballast blue cap burnt up can make 2-second to black, bad lamp can also cause 2-second to black. You can have the same symptom caused by more than one type of component failure.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Vizio VO420E Black Screen, HELP!
Did you check the CCFLs?Comment
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Re: Vizio VO420E Black Screen, HELP!
I haven't been able to check the CCFL's yet, I'm currently at work. I will check them in the morning. It sounds like thats what it is considering I changed the board and it's still doing the same thing. Will I be able to tell immediatly which ones are burnt out or is there a certain way to check them? If it does end up being the CCFL's, where would one go about getting replacements as I haven't been able to find them through the minimal research I've done on them tonight.Comment
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Re: Vizio VO420E Black Screen, HELP!
http://www.ccflwarehouse.com/ this where most people here get them. Just be real careful when you remove that LCD panel from the frame assembly, VERY easy to break it.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Have had two Acer K272HUL monitors die with the same symptoms:
- Blue power light is illuminated while the monitor is plugged in
- Black screen (no splash screen, etc.)
- Power button doesn't do anything
Opened it up and checked for bad caps and components, evidence of burns, etc. - everything looks fine.
Power supply voltages are fine.
There are some signal lines on the power supply harness that goes from the power supply to the logic board, not sure what these should be at.
Anyone have any ideas?...12-09-2023, 10:22 PM -
Hello everyone !
My name is Chris, I am a 30 years old embedded software developer working in the automotive industry. I am really passionate about learning new skills and repairing/crafting stuff. I came around this forum last week with the goal of repairing my faulty gaming laptop, indeed, I was video editing on it when suddenly a black screen popped and never disappeared
I bought some stuff to try to repair it and learn as many things as possible about computer repairs but nothing worked so far. When the black screen appeared, my legion 5 pro was connected to my external monitor...
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Hi everyone,
I have this strange behaviour with Acer Aspire E5-574-52RH, i5 6200U, intel graphics, DA0ZRWMB6G0 Rev G, model ZRW.
Laptop came in for a SSD upgrade, took everything apart to install the SSD.
Everything started after modifying BIOS settings to boot UEFI instead of Legacy.
Laptop works fine, i installed windows 10 and drivers/updates, everything works ok(when it works)
The black screen problem is random, maybe 5 out 10 times, laptop remains with the black screen, no image
Symptoms are:
- random black screen after displaying Acer logo...
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