My THIRD Insignia NS-32LCD!!

[Paul678]

I was hoping this was going to be yet another simple power supply
issue like the last two, but it was not to be.

This time I used my oscilloscope to check the +24DCV and +5V,
to make sure they were stable, and they were.

The backlight was not working, even with the +24V there, but the
"BLON" (back light on) pin was at zero volts, so I jumpered
this pin to +5V using a 1k ohm resistor, and the lamps turned
on, working just fine, but the screen was a blank black screen,
because the main board wasn't displaying anything, no menu
or anything.

So it's pretty clear it's a main board issue:



"BLON" (back light on) pin is on the white connector on the right most, bottom
corner. I measured some of the resistors in the lower right corner at +3.3V, but there
were also some areas that measured a weird +16V. WTF??????

But most of the advice here is for SMPS, inverters,
fuses, and caps, but not so much advice for fixing
main boards, so I ain't holding my breath, but just
in case someone knows something about this board,
I'm naturally all ears......

But it looks like it's Ebay time, yet again!

[tom66]

Re: My THIRD Insignia NS-32LCD!!

There are several DC-DC converters and voltage regulators. I have had the DC-DC converter fail on a similar Harwa chassis, which caused the TV to lock up then not power on after being turned off.