Insignia NS-LCD32-09 with power on/off issues

[waitery]

Re: Insignia NS-LCD32-09 with power on/off issues

Still working?

Hi Bud,

Yes, it worked. I added solder to all the legs of the various FET's on the main board and it's working again. The shotgun approach worked! Thank you for all your help!!

[budm]

Re: Insignia NS-LCD32-09 with power on/off issues

That is great to know, good job fixng it..

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

So I'm having this exact same issue with my Insignia NS_LCD32-09 tv. Should I start a new thread or just post here?

jcg

[waitery]

Re: Insignia NS-LCD32-09 with power on/off issues

I would do the same thing that Bud advised me to do. Add solder to all the FETs on that power board. Let us know what happens. Good luck!

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

So your talking about the board that you posted a picture of in post #14 on this thread, right? Mine looks the same as that pic. When I look at the board it's looks like there are 9 FETs total, that sound right? There are 4 on the big huge heat sinks and then there are 5 more standalone ones with smaller heat sinks on them. I'll wait for confirmation and then go resolder them all.

jcg

I would do the same thing that Bud advised me to do. Add solder to all the FETs on that power board. Let us know what happens. Good luck!

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

OK, I touched up each of the 3 pads on all the heat sink parts and still have the issue. When the TV turns off I still have 5 volts on the connector going to the main TV board, PS_ON goes from 5V down to ~0V, and both 24V and 12V go away. Any ideas what to try next?

jcg

[CapLeaker]

Re: Insignia NS-LCD32-09 with power on/off issues

post a high res pic of the backside of your board.

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

I installed the board back into the TV so here is a picture of it. If you need the other side of the board I'll have to remove it from the TV again and take a pic. It's pretty much the same board photo as post #14.

jcg

[CapLeaker]

Re: Insignia NS-LCD32-09 with power on/off issues

the other side.... and high res... so we can maybe identify with some sharp eyes any bad solder joints. Usually bad solder joints are there were things get really hot. So look at the fets, diodes and transformers. You may need magnifiers.

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

The website lowers the resolution of images you upload (I believe) to make things faster, so not sure I can get a good enough picture. I'll look over the board with a magnifying glass, and I've done enough soldering I should be able to spot a bad solder joint if that's it.

Besides that if someone can point me at some things to take voltage measurements on that may help debug this please let me know. I looked at all the caps and they look fine, but sometimes they don't bulge out even when they go bad. I'm pretty sure it's the power supply board so hopefully we can figure this out.

jcg

the other side.... and high res... so we can maybe identify with some sharp eyes any bad solder joints. Usually bad solder joints are there were things get really hot. So look at the fets, diodes and transformers. You may need magnifiers.

[CapLeaker]

Re: Insignia NS-LCD32-09 with power on/off issues

Try heating the board to see if you can speed up or slow down the turn off?

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

OK, I just took the power supply board off again and looked at all the solder joints on the back side with a magnifying glass. Thought I found something but then looked at the schematic and U951 pin 13 is a NC (it didn't have any solder on it). Anyways I touched up C941 as it was the only part I found that MAYBE could have had an issue, so just turned the TV back on and will report if it fixed the problem.

Besides that any places I can take voltage measurements to see where the fault is? I can try heating things up, but would like to know if there is a certain part that is a likely culprit vs just randomly heating things up.

jcg

[CapLeaker]

Re: Insignia NS-LCD32-09 with power on/off issues

Could be the power supply, could be the main board. Your TV turns off to standby after 5 to 7 mins? So something has to get warm or hot.

To verify the power supply you can try to force it on manually with a 1k resistor and load up each rail and wait until something quits. It still could be caps too, but for that you would need a proper ESR tester.

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

When I freeze spray the 100uF 470V large black capacitor that is right above the AC cord connector it seems to fix the problem (at least temporarily). It's hard to tell because I might be cooling off some other parts that are near by. If that cap was going bad would it cause this problem?

jcg

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

So anyone have any ideas what I can try for a next step? Some voltage measurement that would point at the fault when the TV turns off?

jcg

[jcg]

Re: Insignia NS-LCD32-09 with power on/off issues

OK, so wasn't getting much help on where to probe the power supply board to see what may be failing, so I just decided to replace the power supply board as that seemed like the likely culprit based on the others that fixed their issues in this thread. So the PS board came in last night and I replaced it and unfortunately I have the same issue.

At this stage not sure it's worth spending much more money to fix, but if anyone has some ideas on what else this could be please let me know.

jcg

[mirzazahirovic]

Re: Insignia NS-LCD32-09 with power on/off issues

hi guys, got power bord ishues, same power supply buy I don´t get 12v or 24v outs. Please help.