Insignia NS-55E480A13A. Backlogs flicker, then black screen.

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

To Main Board:
1.DET 0
2. 5V 5.3
3. 5V 5.3
4. PS_ON 2.62
5. 24V 23.6
6. 24V 23.6
7-9 GRD
10. 12V 23.6
11. 12V 23.6
12. DIM 2.1
13. ON/OFF 2.8

To LED Driver Board (the original one)
1. ON/OFF 2.8
2. DIM 2.1
3. DET 0
4. 12V 11.6
5-9 GRD
10. 24V 23.9
11. 24V 23.9
12. 24V 23.9
13. 24V 23.9
14. 24V 0 reads -23.9 on the Driver Boards matching pin

n/a

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

https://www.youtube.com/watch?v=xUzCLgoSPGM Did you try the flashlight test?

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

LED Board
1. 2.1
2. 0
3. 2.8
4. 0
10. 23.9
11. 23.9
12. 23.9
13. 23.9
14. 23.9

So there is voltage in 14 on LED but not on power board
on 1. power board is 2.8 but 2.1 on Led board
on 2. DIM is 2.1 on power board but 0 on Led Board
on 3. DET is 0 on power board but 2.8 on Led board
on 10-14 all are 23.6 on led board but number 14 on the power board is 0

I unplugged the led board wires and tested them with power on and all were 0


nomoresonys, you are correct I had them reversed. There is audio but the flashlight test...I didn't seem to see anything, even hitting menu. There is nothing plugged into tv though(cable)

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

Also:
On top of the led board there are wires that go into the back of the tv and disappear. I read them,
1. red wire 23.4
2. NO wire 23.4 ?
3-10 0 could be grounds
11. 23.4
12. 23.4

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

OK, just redid the flashlight test....YES it does show 'no signal' on the screen when the flashlight is on it.

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

So according to this video, it is usually the led driver, which I did switch out and it still didn't work. I've looked around for a power board to buy, but no luck yet. I still have the tcon board...thinking I'm just going to try it out just in case. Otherwise, I guess I'm going to have to learn how to test and replace components on the power board itself. I don't wanna give up!

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

I inserted carefully with plastic gloves as instructed with video. No luck with the t-con board.

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

Could try a firmware update/reapply, had a quick look at insignia site but didn't see an update for this model or I missed it?

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

If you could see the menu with a flashlight well enough and the menu responded to remote, you could try a factory reset, not sure if there's an alternative way to factory reset.

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

BUT those things won't work if it's a led backlight problem, if one of the led backlights burn or shorts out, all the backlights shut down, kind of like the old Christmas lights, remember the "fun" of trying to find the one burnt bulb?

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

So according to this video, it is usually the led driver, which I did switch out and it still didn't work. I've looked around for a power board to buy, but no luck yet. I still have the tcon board...thinking I'm just going to try it out just in case. Otherwise, I guess I'm going to have to learn how to test and replace components on the power board itself. I don't wanna give up!

Your powersupply board looks to be ok to me.

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

You have audio and display, that usually means the tcon and mainboard are ok, powersupply looks ok, if you got a good driver board, the only thing I can think of is a burnt or shorted out led or backlight circuit, one of the supertechs could probably figure this out right away.

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

Ya, I hooked cable up, flashlight picture and sound are there. How do I locate one if those supertechs?? Again thank you!!!!

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

https://elektrotanya.com/?q=keres see if you can get a service manual there.

[nomoresonys]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

I think the key would be to know EXACTLY how to and what voltages to expect during the LED driverboard and backlight tests.

[budm]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

So at this moment, do the backlights still come on for seconds then go black?

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

yes, it was one of the first things I downloaded. It was foreign to me, although when I just looked at it again, at least I can identify the different boards.

[budm]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

BTW, there are three fuses on that LED driver board, are they all good?

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

budm, Yes, they pop on for one sec once I put it in standby, and again when I turn it on.

[sameoldsam]

Re: Insignia NS-55E480A13A. Backlogs flicker, then black screen.

budm, haven't checked the fuses, have tried both the original and a new(old) one with the same result though. I will try to locate the fuses now. thanks!