Re: Insignia NS-55D420NA16 Backlight Problem
I would indeed use suction cups.
I would indeed use suction cups.
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Re: Insignia NS-55D420NA16 Backlight Problem
Using LED backlight tester to apply voltage to my Insigna NS-55d420NA16, I get 331 volts on the tester. The power supply was disconnected. None of the LED's light. Is the wire between the power supply connector and the first LED strip open?Comment
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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: Insignia NS-55D420NA16 Backlight Problem
I fixed mine. It had two failed LEDs, one of them burned in a way it damaged the traces on the led strip so it had open circuit.Comment
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Re: Insignia NS-55D420NA16 Backlight Problem
Glad to hear it, nice save.
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Re: Insignia NS-55D420NA16 Backlight Problem
I found one the LED's was open. When I tried to remove the bad led with a hot plate. The LED broke into parts. The part that was soldered to the smaller pad did not want to unsolder because the connection to board foil are via a plated thru hole and trace. Only 3 of the 11 strips were without bad LEDs. I replaced all of the strips with new ones. When I put everything back together without the back, I got a great picture. I next installed the back and base. When I set the TV on a stand, I powered the TV back on I had a crack in the screen. I don't know if the crack happened after installing the back or after setting the TV on the stand.
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Re: Insignia NS-55D420NA16 Backlight Problem
Did you use suction cups?
I did as recommended above and everything went well.
I also watched shopjimmy's video and identified the suction cup model they use:
https://www.homedepot.com/p/QEP-4-7-...000Q/100119050Comment
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Re: Insignia NS-55D420NA16 Backlight Problem
I have the same TV with a bad LED strip. I was able to isolate the one bad LED, and I have removed the LED from the PCB. Anyone know where I can find the correct LED for my LED strip so I can fix this strip and get this thing back up and running? LED strip PN: 4C-LB550t-GY2Comment
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Re: Insignia NS-55D420NA16 Backlight Problem
If you need the set, you can get from here:
https://www.shopjimmy.com/hisense-in...5d420na16-new/Comment
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Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
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.... -
Hello, I came here after finding some similar questions asked on other monitors and hope someone here can help me get an ancient Viewsonic VP230mp (23" 4:3 LCD) back to working condition.
First a little background, I have a background in computer and electrical engineering, and I'm smart enough to know I know nothing about LCD displays and how they work. For this topic I'm as green as they come.
When the display is turned on the viewsonic logo displays in the uppper left for 2 seconds then the screen goes black, the power LED is green (on) and when a computer is connected... -
TCL 75S421
PSU BOARD: 40-L402H8-PWD1CG
it shows not even a flash of backlight when powering up.
but the tv appeas to turn on and i can hear the sound of the menus moving and clicking. i can power down the tv with the button.
testing the backlights with my tester all 4 strings lit up and showed similar voltage drops. around 110 or so.
unplug mb and leave only psu plugged into backlights (PSU + BL SELF TEST MODE?) does not light the backlights.
i do see 24v but 0v on PSON and BLON (i didnt write this down tho so cant be sure)
with mb connected, PSON...
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