Insignia ns-42pdp (lg pdp42x30000)

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Is this what you are talking about?

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

There is a -Vy and Vsc module. The -Vy module should be marked. Yes it's one of those stand-up board things which has lots of other parts on it.

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Ok...let me remove the board and I'll get it off and get some pics of it...

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Took me forever to get that board loose!

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

B

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Ok, worth checking a few things:
- D22/D23 for shorts
- C20 solder joints look dodgy
- Q20 for shorts
- VR20, between outer two terminals, what do you measure on 200kohm range?

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

D22...490
D23...496
C20 are good tight joints
VR20 outer terminals at 200kohms...1.8
Q20...
G:open D:+ S:- no reading
G:+ D:open S:- reading hits .957 and quickly drops to 0
G:- D:open S:+ reading 737
G:open D:- S:+ reading 570

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

b

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

b

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Sorry for missing your post.
Nothing obvious there, I'm afraid. Nothing shorted.
Perhaps try replacing the IC "U20"...

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

That little black thing? This should be fun...
Is there any way of testing it?

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Yeah, the 8 pin part.
No easy way to test it, I'm afraid.

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

I gotta find a magnifying glass so I can read whats on it...
Be back when I get all this done...

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Ok...I finally got this little chip off the board...It has 200D6 PYIC printed on it.
That was a royal pain to get off so I can imagine what it will be like putting it back on..

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

B

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Would appear to be this part:
https://cdn.badcaps-static.com/pdfs/...f150efe308.pdf

Available from Digikey, 1-off for $1.10 + shipping:
http://www.digikey.com/product-detai...OSCT-ND/644040

May be worthwhile to replace the output capacitors (200V/400V ones) as they may also be suspect. What values are they?

For future reference, to remove:
- I remove these types of surface mount chips by flooding both sides with solder, then alternating the soldering iron between sides.
- I lift the device off with tweezers.

Putting it on is pretty easy...
- Line up the pin 1 marker with the chip
- Solder one pin to tack it to the board. Apply a little heat to the pin and move the chip until it is aligned.
- Solder the opposite corner, check all is aligned, then solder each pin individually.
- Flux can help. Check afterwards for bridges then remove with flux and soldering iron, or solder wick and a soldering iron.

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Yes sir, that appears to be the part...
I will get that on order...
The mosfets are on there way and should be here by Friday...

When you say "pin 1 marker", what am I looking for?

To clarify, the caps we are talking about are the three, 400v/10uf /U3A/105*C that are on the module,is that correct?

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Those capacitors are them, yeah. What is the diameter and height of them, approximately?

There's usually an indent or a small dot sunk into the packaging of the device. The closest pin to this is pin 1. If there is no indent, then pin 1 faces the bottom left of the device when the half-moon shape is on the left hand side of the device and it's facing up. Also you can usually read the part number this way around.

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Also maybe worth replacing the 35V cap too... it won't be expensive.

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Looks like the caps are 10mm x 17.5mm

the 35v is 6.3 x 11...

There is a small bar like indention on the face where the numbers are on the chip