Insignia NS-32E400na14 TV Repair - Page 1
Forum section: electronics / repair

author: CommWiz
author_rank: Newbie
timestamp: March 16, 2017, 06:59:47 am
content: Hey all,I have an Insignia NS-32E400na14 TV that when plugged in, the power LED comes on, but it will not turn on (power light turns blue when working). Has anyone had any experience repairing this model, schematics, suggestions?. This is a three board system, Power Supply, Control/Video/Sound, Display Driver (TCON). This TV started having this issue and could be resurrected by unplugging/plugging it back in, so I suspect the power supply. I will be posting some pictures of the PS as soon as I get a chance to take the pictures. The TV doesn't respond to the power switch nor the remote, and yes I have checked the batteries. The power supply is marked well, but cannot find any schematics online. A visual inspection of the PS doesn't show any hot spots or bulging caps or burned components, no noise(wining). I checked voltages and it seems like most of the marked voltages are there, a couple are missing, but I'm not sure if this is due to the mode the TV is in (off). One suspicious voltage is PS_ON and is measuring about 4.7 volts and is noisy. There is a zener diode in this circuit a 5v6 and may be folding, hince the 4.7 with noise. I haven't done a comprehensive suite of tests on it yet and hoped to find some more documentation (schematics) before going much further.Any help would be greatly appreciated, thanks in advance.

author: Rasz
author_rank: Super Contributor
timestamp: March 16, 2017, 07:43:18 am
content: sounds like boring capacitors

author: kingtutt
author_rank: Newbie
timestamp: January 19, 2020, 04:38:11 pm
content: Did you ever find the issue with your TV?I have an Insignia ns-32d511na15 and like you, cannot find a schematic. The TV will not turn on at all. Checked hot side of the Switch Mode Power Supply (PS) and all looks fine. All caps look fine. One problem I have is the power supply and main board are combined. Would be much easier if they were 2 sep boards....then all you have to do is check the output plug on the PS to verify its operation. Can't fine a schematic which makes it difficult.

author: Rasz
author_rank: Super Contributor
timestamp: January 19, 2020, 10:01:03 pm
content: Quote from: kingtutt on January 19, 2020, 04:38:11 pmdoesnt matter how they look

author: GreyWoolfe
author_rank: Unknown
timestamp: January 19, 2020, 10:57:38 pm
content: Quote from: Rasz on January 19, 2020, 10:01:03 pmI agree, I look fine but you wouldn't want to look on the inside. Still need to check the electros.

author: CommWiz
author_rank: Newbie
timestamp: December 21, 2024, 03:19:49 am
content: Sorry for not responding, until now. The answer to your question is no. I never have completed the repair and the TV has been patiently waiting for me to get a round-tu-it. At the time, I saw a couple posts that mentioned that it's the EEPROM on the board. I guess they become corrupted, or fail in some way. I saw "ShopJimmy" had them for sale, so I was going to get it from him. I never did, maybe I'll resurrect this project. Thanks for the inquiry and let me know if you were able to repair your TV.CW

author: Bud
author_rank: Super Contributor
timestamp: December 21, 2024, 10:24:02 pm
content: Insignia NS-32D20SNA here was fixed by replacing PS capacitors.Shine a flashlight on the screen, turn the TV on and check if you see faint image behind the screen glass, before the TV turns itself off. If you see that then this is backlight failure, typically caused by dried caps on PS board.

author: CommWiz
author_rank: Newbie
timestamp: December 27, 2024, 03:33:41 am
content: Thanks for the response. I'll start checking the output caps to see what they read. in the failure mode, the TV will not turn on, the power standby remains in stand by. There is now a secondary issue, the button panel circuit board was broken in half a couple of years back when moving the the disassembled TV. It looks like just a analog switch matrix so it should be pretty easy to replicate, but I would like the schematics to confirm that the resistors are all the same values. I have the first resistor, the rest were lost over time on the other half of the PCB. Also, during some research I found this issue listed on shop jimmy, and they said it was an issue with the eeprom on the board. It has the expected voltage values for each of the buttons. If this becomes corrupted, then the TV will not turn on.Thanks again.

author: CommWiz
author_rank: Newbie
timestamp: March 27, 2025, 06:30:11 pm
content: It turns out the issue is with the EEPROM on the main board. I ordered a replacement main board, but it wasn't the exact model I needed. The panel it supports is different, though otherwise, it's the same. I swapped the EEPROM, and the TV now works in that it turns on and off. The only problem is that the display is stretched and somewhat garbled. So, I still need the correct EEPROM. In my previous search for issues with this TV model, I came across the Shop Jimmy website, which offered the EEPROM. I didn't order it then, as I didn't know the root cause of the problem. But now that I do, I'll order one, and that should resolve the issue. I'll provide an update when I receive it.