Insignia NS-LCD32-09 doesn't usually power up.

[Jidis]

Hi,

I hoped I might be able to fix this for my sister, but I'd like to try to narrow it down as much as I can before ordering anything.

It was supposedly taking multiple power button hits (remote or panel) to get it to boot, then eventually stopped coming on at all. The front LED will go from red to blue with no other sign of life. I've now verified that, by sitting there turning it on and off a bunch of times and have seen it boot maybe three, so it's not totally dead yet.

Does this behavior for that model sound familiar to anyone or does anyone know which components or board might be responsible for it? The supply caps still look to be in good shape and the couple I poked at didn't seem terribly high on ESR, but I can pull a board and get some more thorough checks if it would help. The main supply voltages seemed OK, even while in the "dead" state, with the 24V maybe being a volt or so higher.

Much thanks!

[budm]

Re: Insignia NS-LCD32-09 doesn't usually power up.

You will get a lot more help if you upload good clear pictures of the whole backside of the TV showing all the boards so we can see what we are dealing with.

[Jidis]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Bud- I'm guessing you mean close-ups not the overall layout. I'll go get some.

Thanks

[Jidis]

Re: Insignia NS-LCD32-09 doesn't usually power up.

These aren't great, so let me know if you need better ones (not the best lighting where it is).

Thanks

[nomoresonys]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Try heating those round electrolytic capacitors on the mainboard with a hairdryer, then see if it starts right up, there's a bunch of them. maybe one or such are faulty.

[budm]

Re: Insignia NS-LCD32-09 doesn't usually power up.

You need to report the Voltage reading on the power supply connector that goes to the main board, the pins for the connector are label so you MUST put down the pin name and follow by the Voltage reading for each pin when TV is OFF and when power switch is activated so we can easily see if any of the output Voltages and Control Voltages are missing or not.
There are two vesrion of the power supply board, I am not sure which version you have: https://www.shopjimmy.com/vizio-insi...wer-supply.htm

[Jidis]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Sorry it took me a bit to get these new checks. Here are the voltages I got:

Off State:

on/off - 0
dim - 0.02
12V - 0
12V - 0
GND - 0
GND - 0
GND - 0
24V - 0
24V - 0
PS - 0.06
5V - 5.0
5V - 5.0

Dead On State:

on/off - 0
dim - 0.56
12V - 12.2
12V - 12.2
GND - 0
GND - 0
GND - 0
24V - 25.2
24V - 25.2
PS - 4.17
5V - 5.0
5V - 5.0

On State:

on/off - 3.22
dim - 3.35
12V - 12.6
12V - 12.6
GND - 0
GND - 0
GND - 0
24V - 25.7
24V - 25.7
PS - 4.12
5V - 4.98
5V - 4.98

The on/off and dim lines evidently aren't enabled when it turns on dead. I also noticed that when you turn it off from the "dead" on state, the panel light flashes red about 14 times before going solid. If you can get the set to actually boot, then turn it off, it only flashes a few. I still haven't found a formula to get it to fully boot. You just have to keep hitting power after the light goes blue, and after a while it might come on, but most times it just turns it off again.

Re: the Heat- I tried the hair dryer on both the mainboard caps and the PS. It didn't seem much easier to boot, though I'm not sure I brought them up very high in temperature.

Thanks Again!

PS- This does appear to be the same PS board pictured at Budm's shopjimmy link (with plug-in wiring).

[nomoresonys]

Re: Insignia NS-LCD32-09 doesn't usually power up.

You mean the front led goes from red to green, correct?

[Jidis]

Re: Insignia NS-LCD32-09 doesn't usually power up.

You mean the front led goes from red to green, correct?

It's actually red to blue on this one, but it'll go blue even when it doesn't properly turn on.

[nomoresonys]

Re: Insignia NS-LCD32-09 doesn't usually power up.

With tv plugged in but off which is standby, check the voltage of the main filter cap C907, then turn tv on and check it, set meter to 200 vdc or next one up, positive probe on + positive leg of capacitor, negative probe on - negative leg, report both voltages here, BE VERY CAREFUL not to touch anything with your hands, this is the HOT/DEADLY side of the board.

[nomoresonys]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Could also heat up the inverter board with hairdryer, third picture, see if it reacts any better.

[budm]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Dead On State:

on/off - 0
dim - 0.56
Main board issue, exact cause I do not know.

[Jidis]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Thanks guys!

At standby, that main cap is giving me 175VDC. It rises to 396V in that "dead on" state. I tried to check it at fully on, but I couldn't even manage to get it to fully boot this time after a zillion attempts for some reason. <EDIT> Got it on once now and it went to 387V, so I guess that dead on state is around normal.

Hitting the inverter parts with the hair dryer didn't do it either.

Bud- Are you pretty sure about the main board being the culprit? I may look for one just in case. I'll also try to get it out later tonight and examine the bottom and maybe check some caps on that one.

Thanks Again

[budm]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Main board controls those two signals for the backights inverter board, so no ON/OFF, no DIM = no backlights. Something is causing the micro controller on the main board not to send those two signals to the inverter board.
You should read Basic LCD TV troubleshooting guide to understand how LCD TV works.
You can also force on the inverter board by disconnecting the ON/OFF and DIM wire going to the inverter board then use two pull-up resistors to simulate ON/OFF and Dim control signals, if everything else are OK then you should have backlights and all other functions of the TV.

[Jidis]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Hey Bud,

I just tried with a couple 1k pullups to 5V on those two lines. It gets the backlight to come on when the set is turned on, but I don't get an image unless the set gets into the fully on state. If it's in that dead on state, I just get a glowing black screen.

Take Care

[budm]

Re: Insignia NS-LCD32-09 doesn't usually power up.

That means when in failed mode you just do not just lose the Backlights control signals, you also lose other function as well, so it is time for a replacement main board.

[Jidis]

Re: Insignia NS-LCD32-09 doesn't usually power up.

time for a replacement main board.

Got that on the way now from Electroparts, though it probably won't get here until after Christmas. Hope it fixes it (and lasts a while afterward).

Thanks All!

PS at Anybody- From the stuff I read, it sounded like the Insignias are a BestBuy house brand that goes by different names. Just curious, but what other brands are clones of it?

[nomoresonys]

Re: Insignia NS-LCD32-09 doesn't usually power up.

Yep, best buy house brand, not sure but don't think it goes by any other name, I do know if you compare them at best buy the insignia has the much dimmer picture compared to most name brands.

[budm]

Re: Insignia NS-LCD32-09 doesn't usually power up.

https://www.shopjimmy.com/catalogsea...ia+NS-LCD32-09
You can see that the TV boards, LCD panel from many manufacturers, then put them together and slap the Insignia brand on it.

[Jidis]

Re: Insignia NS-LCD32-09 doesn't usually power up.

TV is up and running!

Main board showed up a few days early, so it's in and looks fine. I did have the bottom of the cable box image a little off the screen when I connected to that, but I think it's just in the wrong screen mode (I didn't get the remote with it). I'll get them to bring the remote when they come get the set to make sure.

Much thanks to Budm and Nomoresonys for the help!

BTW- You guys here helped me diagnose a 46" Samsung years back (needed a new power supply). It's been doing great ever since. That's my main personal TV for my bedroom.

Merry Christmas