Insignia NS-LDVD32Q-10A, No Power

[johnboy1313]

I picked this one up tonight, hoping it would be bad caps. No luck. I've got 162.5V across the big cap and 5V on 5VSB, but that's it. No response to the power button. I tried forcing the PSU on with a 219 ohm resistor from 5VSB to PSON with no positive results. At any rate, I figure either I'm doing it wrong, or there's something wrong with the PSU. Can one of you verify that what I'm doing is correct?

I just pulled the PSU and found two arc burns on the back of the panel, but I don't see any damage to the board.

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

more pics

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

The areas circled in red are where the arc burns are on the panel.

[budm]

Re: Insignia NS-LDVD32Q-10A, No Power

It has PFC Voltage booster, so if you force on the power supply and the Voltage on the big cap did not jump up to 370~390V, then you need to get that section working first. You have to force on without the cable going to the main board still attached. So you may have problem with the main board at this point also.
By the way, I could not find the Info for the IC on the other Insignia you are working on either. You sure pick one of the bad brand to work on.

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

It has PFC Voltage booster, so if you force on the power supply and the Voltage on the big cap did not jump up to 370~390V, then you need to get that section working first. You have to force on without the cable going to the main board still attached. So you may have problem with the main board at this point also.

The main is not connected

By the way, I could not find the Info for the IC on the other Insignia you are working on either.

I saw that

You sure pick one of the bad brand to work on.

Thanks for the heads up.

[budm]

Re: Insignia NS-LDVD32Q-10A, No Power

OK, then you will have to fix the PFC circuit first.

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

It looks like someone has been in here before me. I spent the last couple hours combing over the board only to see three holes where Q4 used to be. Unfortunately, it's gone and I can't find any literature anywhere to tell me what it should be.

[tom66]

Re: Insignia NS-LDVD32Q-10A, No Power

Can you highlight where Q4 should have gone?

[Ashroyer05]

Re: Insignia NS-LDVD32Q-10A, No Power

did you try "jumping" ps_on to gnd?

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

No, I haven't tried grounding PSON yet.

I've highlighted where Q4 should be with red circles and arrows.

[tom66]

Re: Insignia NS-LDVD32Q-10A, No Power

Looks like it might be a TL431 type device.

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

Yeah, I'm going to try to contact a few ebay sellers and see if any of them would be kind enough to let me know the part number. On top of that, there are two plugs, one on the top of the main, and one on the top of the PSU that look like there may have been a harness connecting them. I had a Sanyo with a similar issue once. Once I tracked down the harness, I found what looked to be a panel issue. I've been trying to find any posts related to the same set, or one with the same PSU to see if there is supposed to be a harness there.

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

Thanks to budm, it looks like the separate harness is not missing. It just isn't needed.

https://www.badcaps.net/forum/showth...light=insignia

Hopefully, anyway. This one's just the slightest bit different.

[inadim]

Re: Insignia NS-LDVD32Q-10A, No Power

Hello,after check the V boost,for me,the best results to force PS-ON,is
with a 9V battery and a 10K series resistor.
Always with the PSU out.
Good luck.

[inadim]

Re: Insignia NS-LDVD32Q-10A, No Power

Hello,after check the V boost,the best results to force PS-on is with
a 9V battery with a 10K series resistor.
Good Luck

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

One of the ebay sellers responded that it is a 2n4401 transistor. I put one in and still cannot force the PSU on. I wish I could find a schematic for this thing. Note to self: no more store brands.

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

I was able to retrofit the PSU from an Element FLX-3210 into this set to get it working. I had to build the harnesses from the inverter and main to the PSU. It was fairly simple. For what it is, it's still a nice little set with a functioning DVD player built in.

Original PSU, If you care enough to take the time, you can read the pin labels to the connectors in the original post.
http://www.shopjimmy.com/megmeet-mp0...upply-unit.htm

Here's what I swapped in.
http://www.shopjimmy.com/polaroid-86...wer-supply.htm

[budm]

Re: Insignia NS-LDVD32Q-10A, No Power

Good job, so the mounting holes of the old board match the sub board? I had to make some bracket/mounting plate to mount the substitute power supply when the mounting holes do not line up with the original P.S.

[johnboy1313]

Re: Insignia NS-LDVD32Q-10A, No Power

Good job, so the mounting holes of the old board match the sub board? I had to make some bracket/mounting plate to mount the substitute power supply when the mounting holes do not line up with the original P.S.

Sorry bud, I missed your post. The new PSU came out of an Element with a stamped sheet metal control box. The mounting posts for the original PSU were inboard to the mounting holes on the new PSU. I made an adapter by cutting the back portion that included the new PSU's mounting posts out of the control box and drilling four holes in it to screw it to the old PSU's original mounting posts. I then mounted the new board to the adapter. It stuck the PSU a few millimeters further out toward the cover but there was no interference with reassembly.