Insignia NS-LCD42HD-09 / no screen

[happy seal]

First off,
My name is Paul and thanks for having me on and for what you guys do! Christmas morning we tried to plug a Wii U into the hdmi port on the tv and it went blank. Blue light on LED and that's it. Turned it off and unpluged tv for a couple minutes. Plug back in and red light blinks three times and then stays solid red until power button is pushed and then turns blue with nothing happening with screen or sound.
I called customer service and they led me through a rebbot and then said tv would need to be looked at.
I having some electronic experience so I pulled the cover and looked for burn spots, loose connectors, melted solder joints, swollen caps. I blew off all the boards but dont see anything wrong. I retried a bunch of times but don't see any fuses or voltage test points. I really don't have money for a new tv so we are borrowing a 19" pos.
Thanks in advance!

[Mr Bill]

Re: Insignia NS-LCD42HD-09 / no screen

Have you tried shining a very bright flashlight through the panel in a dark room to see if am image can be seen?

[happy seal]

Re: Insignia NS-LCD42HD-09 / no screen

No but give me 10 minutes and I will!

[happy seal]

Re: Insignia NS-LCD42HD-09 / no screen

No change at all. Screen is black as can be!

[Mr Bill]

Re: Insignia NS-LCD42HD-09 / no screen

Do you have a multimeter? If so, check the voltages from the power supply with the tv on. Post you results like

5v - 5.12
12v - 12.34
24v - 24.43
PSon - 3.2v

ect ect.

I drew a square around the legend on your power supply.

[happy seal]

Re: Insignia NS-LCD42HD-09 / no screen

Very sorry for the delay. Gotta a boat load goin on here!

starting at the single 12 pin connector closest to power in cord
are as follows. Tested in AC with ground probe on ground stud on board

5V - 4.98
5V - 4.98
PSON - 3.43
24V - 24.36
24V - 24.36
GND - 0
GND - 0
GND - 0
12V - 11.88
12V - 11.88
DIM - 0
ON/OFF - 0

Next 13 pin connector closest to the edge of board

Blank
Blank
Blank
GND - 0
GND - 0
GND - 0
GND - 0
GND - 0
24V - 24.36
24V - 24.36
24V - 24.36
24V - 24.36
24V - 24.36
Next 13 pin connector closest to the inside of board

DIM - 0
ON/OFF - 0
ENABLE - 0
next 5 are GND and are all 0 Volts
next 5 are all 24 V and are all 24.36 V

This was with power cord plugged in and LED Blue / TV on!
Hope this gets us somewhere.

Thanks guys!

[budm]

Re: Insignia NS-LCD42HD-09 / no screen

"DIM - 0
ON/OFF - 0
ENABLE - 0"
The main board is not working, it is not sending any Dim control signal or the Backlights ON to turn on the backlights.

[happy seal]

Re: Insignia NS-LCD42HD-09 / no screen

Main board = NO GOOD!

I guess I can replace these boards? Where might I pick one up and is it worth the price?

Thanks!

[kevinm34232]

Re: Insignia NS-LCD42HD-09 / no screen

Cant see the sticker # on the main board but look up the white sticker # on ebay and shopjimmy.com

[happy seal]

Re: Insignia NS-LCD42HD-09 / no screen

Is this board fused?

[happy seal]

Re: Insignia NS-LCD42HD-09 / no screen

Cant see the sticker # on the main board but look up the white sticker # on ebay and shopjimmy.com

$74.00 - woo hoo! Now I need to wait till payday for 74.00!


Your pretty sure that's it heh? Awe never mind. You guys know what your doing!

[darthfaderz]

Re: Insignia NS-LCD42HD-09 / no screen

I have this same TV..same Issue.

and there was no follow up.

I replaced the power board...so I assume by main board you mean the one with the inputs on it correct?...I have a multi-meter but am not so good on the electronics side and am afraid I will put it on wrong setting and blow its fuses.

[darthfaderz]

Re: Insignia NS-LCD42HD-09 / no screen

Furthermore, mines backstory is as such

dad bought this thing from best buy brand new. but no extended warranties..etc..

Worked fine for over 1.5 years...then during electrical storm, was not on surge protector..screen went black and never came back.

Recently moved and I offered to take it under the guise that a repair person he knew said that it was likely a fuse on the board that went bad, he also took it to a repair shop which said same thing but he didnt want to pay labor+parts which were going to be more than the TV was new when he got it to fix so he replaced it and shoved it in the closet until I got it.

Skip ahead...I have it...pop back off..can't find said fuse to replace, but find a cheap power board to swap with on ebay. Get it...tv does same thing. Light comes on, turns blue and holds with no sound or image. when i shut it off the LED blinks 14 or 15 times; which I have later learned is a hardware failure.

So, its sat in the other room for close to 3 months now. I am uncertain if its the main board but posts like this and others lead me to believe it is so...or the backlight panels..or TCON, and I pulled the pin connectors off to test voltage going to main board, then realized I was uncertain which points I should look at to determine if this issue is same as the OP of this thread...

any help is appreciated.