Insignia NS-55D420NA16 Backlight Problem

[nomoresonys]

Re: Insignia NS-55D420NA16 Backlight Problem

I would indeed use suction cups.

[letienne]

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?

[budm]

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?

You have open circuit, I.E. broken wire/s, LED, connector/s between LED strips.

[zape]

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.

[nomoresonys]

Re: Insignia NS-55D420NA16 Backlight Problem

Glad to hear it, nice save.

[letienne]

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.

[zape]

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/100119050

[Toocheap]

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-GY2

[hoangmai]

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-GY2

If you need the set, you can get from here:
https://www.shopjimmy.com/hisense-in...5d420na16-new/