TNPA5623 schematic Panasonic needed

[martino]

Hello all,working on a TC-P50U50.
It has the classic Xboard fault,loose screws causing the board to blow up.
I got the repair kit from SJ for it but ran into a problem....
While removing IC-152,a 8 leg little chip,I accidentally damaged the pads on the board
I think I can fix it but could really use a schematic to check where each pin goes....

The board is a: TNPA5623 or TXNSS1SDUU.
I tried Tom's database and a few others and for the life of me can't find a schematic
Would anyone have one? Even a picture of the area where IC-152 sits would be great....

[tom66]

Re: TNPA5623 schematic Panasonic needed

Any of these any good?
http://www.shopjimmy.com/media/catal...s1sduu-top.jpg
http://www.shopjimmy.com/media/catal...duu-bottom.jpg

Part # of the chip - maybe we can make a guess.

AFAIK Panasonic stopped producing full schematics for their boards after the 2012 models, only A board included, so you will be SOL on that. Sorry...

They might release them in a couple of years but since they have stopped making plasmas () I would be surprised.

[martino]

Re: TNPA5623 schematic Panasonic needed

Chip is BD8694.
I looked at those pics too. It helps for some traces.
The chip has a center pad under it that's also soldered to the board.
I will try and make a close up picture of the board if you promise not to laugh at my butcher job lol. It was late and I attempted to clean up the area what made it worse. I then walked away which I should have done earlier lol.

[martino]

Re: TNPA5623 schematic Panasonic needed

I took a picture with my magnifying glass and Iphone,tricky but succeeded
Pic#1 is pic of the area,pic#2 I doodled some red lines on as to how I think it should go...
Would like a second opinion if I'm right..
Does the center pad under the chip actually connect inside the chip or is it just for cooling??

[tom66]

Re: TNPA5623 schematic Panasonic needed

The centre pad is essential for cooling.
That is pretty bad, I am not sure you can repair that.
How did you try to remove the chip? If the chip is stuck, do not pull!! It will come off with surface tension on a river of solder by flooding both ends in turn.

[martino]

Re: TNPA5623 schematic Panasonic needed

That's what happens when it's 3am and you "quickly " want to replace the chip still lol.
Solder iron was set at too low of temp, I flooded the pins with solder and normally it just flips off the board with a little shove from the iron.
It not being not hot enough and me sleepy I pushed a little to hard and did damage. Then I realized it was to cold and cranked up the iron. Made it too hot while trying to clean with solder wick and then I gave up haha.
Don't do this small stuff late at night. I'm not proud of this screw up at all.

[tom66]

Re: TNPA5623 schematic Panasonic needed

My rule: soldering iron goes away at 10.30 pm. No more soldering past then.

[martino]

Re: TNPA5623 schematic Panasonic needed

My rule: soldering iron goes away at 10.30 pm. No more soldering past then.

I'm gonna make that rule on a wooden sign and hang it above my workstation...!!!

[tw2005]

Re: TNPA5623 schematic Panasonic needed

I'm gonna make that rule on a wooden sign and hang it above my workstation...!!!

Sure, I believe you.

[martino]

Re: TNPA5623 schematic Panasonic needed

Well,it took a bit of creative soldering,this time NOT at 3am and Tv is up and running
Tested,zipped up and TV sold

[Alastair E]

Re: TNPA5623 schematic Panasonic needed

Well,it took a bit of creative soldering,this time NOT at 3am and Tv is up and running
Tested,zipped up and TV sold

Well, You Cant Fault That,-- Can ya!

[martino]

Re: TNPA5623 schematic Panasonic needed

i know Sold it for good money too!!!

[tom66]

Re: TNPA5623 schematic Panasonic needed

I really want to get one of these -- trouble is, I'm not sure I would be able to sell it! The PQ is excellent.

[Alastair E]

Re: TNPA5623 schematic Panasonic needed

If you are anything like me Tom, I do up a set--say, like that LG 42PC1DA use it for a while after doing all sorts to it with its IPM's etc, get bored and then will probably replace it with the latest project set!

Got my thoughts on that Pan TH-42PX70 in the garage--Just clearing the decks to have a go at that!
--We see what sorta mess I can make of it!

[dgewertz]

Re: TNPA5623 schematic Panasonic needed

Just found this thread, trying to repair a TNPA5623 with my amateur grade tools.

I bought the ShopJimmy kit and replaced R051 and D041 and Q051. The old Q051 was shorted, but D041 was not. Now that I have the new D041 in the board, legs 1 and 3 are shorted.

Is it possible that my soldering iron somehow damaged D041, or the pads below it? I am leery to connect up the board and blow something up, doesnt seem like these 2 legs should be shorted (and the new component was not shorted).

I did not replace the 8 pin IC. Could that somehow be causing this issue?

[dgewertz]

Re: TNPA5623 schematic Panasonic needed

Just removed D041 from the board; the component is not shorted, but the throughholes on the board for legs 1 and 3 are shorted.

Is that normal??

[tw2005]

Re: TNPA5623 schematic Panasonic needed

Just removed D041 from the board; the component is not shorted, but the throughholes on the board for legs 1 and 3 are shorted.

Is that normal??

if you checked the diode you should also find 1 & 3 will give same result, yes normal. Legs are A -K -A so A-A (anode-anode )will show short

The SJ kit I see includes the 8 pin driver IC. If you have it i would replace it or accept you may have to start all over again with a new kit

[dgewertz]

Re: TNPA5623 schematic Panasonic needed

Thanks....weird because I checked the component alone and dont see that short (crappy multimeter leads perhaps).

Does the solder flood and wicking method work well to remove the IC? I dont have a hot air tool unfortunately

[tw2005]

Re: TNPA5623 schematic Panasonic needed

Thanks....weird because I checked the component alone and dont see that short (crappy multimeter leads perhaps).

Does the solder flood and wicking method work well to remove the IC? I dont have a hot air tool unfortunately

not always easy to tell if those driver ICs are good that way, best option is to replace it if the parts it drives have failed

Neither do I , but I use 2 soldering irons, flood both sides so the solder covers all 4 pins each side, then heat both sides together so the solder is flowing both sides and then just use the tip like tweezers to flick or lift it off.

Failing that you may be able to cut the pins with a sharp blade to cut the legs against the case , remove the body then desolder each pin, risk there is if the leg twists as it's cut the track may tear or lift.

Or a very fine pair of sharp cutters may get close enough to snip each leg at the casing and same desolder each leg

avoid too mush heat for too long as that too will delaminate the track from the board.
dewicking may work or heat each leg and lift it free from the board whilst the solder is liquid, maybe be tight. Brute force or forcing things to lift off will always tear the pad

flowing fresh leaded solder first helps, as the lead free is pretty hard and higher temp. will assist in getting heat in quicker , less stress on the tracks

before you start , make sure you work out which is pin 1 on the part and where pin 1 is on the board for correct orientation

[Alastair E]

Re: TNPA5623 schematic Panasonic needed

Method I USED to use was some thin Stainless-steel or enammelled wire thread under the row of pins fixed to the board at one end, and after adding a little fresh solder to the row, heat the first pin while applying LIGHT pressure to the wire's loose end where it would be drawn under the pin and lifting the pin upwards.....

Light pressure and it'll unzip the pins from the board, as you move the iron along...

This Horrible Unleaded CRAP solder they make 'em with these days doesn't work so well with this method though, and is no good for chips that are soldered on a pad underneath....

--The old method of a new Stanley-knife to cut the pins from the package sometimes has its place, but great care is needed not to damage the tracks under where you're cutting...