PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

[tom66]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

Flocko do you have an oscilloscope available?

[flocko]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

Just put the old one back as I used Q- chip to get it of so not had that much heat though it, but still have a dim hard to see screen do you think it could be the buffer chip? will take a photo but hard to see it as so dim Flocko

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

Well I think we both need to go to the opticians you with your lost resistor and me for not seeing the wrong number on the driver, all will be fine in the end and its only time and I hope we still have some of that to spare . Thanks again one and all Flocko

So have you swapped it and it's fixed or still in progress?

[flocko]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

Well I think we both need to go to the opticians you with your lost resistor and me for not seeing the wrong number on the driver, all will be fine in the end and its only time and I hope we still have some of that to spare . Thanks again one and all Flocko

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

UTSOURCE will have them , or quite a few chinese suppliers I expect.

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

might want to edit Q616 to 661, if you can.

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

No I just thought as I had one change it, I have tried to get data up on them but had no luck and it was only after I fitted it that I realised it was a 7 not 5,i had it in my box of bits left over from repairing a SC board I tend to buy more when it comes to these small SMD parts as they fly off in to the unknown and get lost forever, I have a TNPA5082 that has a 5 and a 7 on it I will pull that off, I have looked but no one has one. I hope that's what the problem is anyway time will tell. Thanks for all your help Flocko

That's where I got mine off a 5082, you could compare pin for pin and get an idea if the old one was bad, that's what I did but played it safe. Nice work with the SN, looks straight forward although I stuffed my attempt.

[flocko]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

No I just thought as I had one change it, I have tried to get data up on them but had no luck and it was only after I fitted it that I realised it was a 7 not 5,i had it in my box of bits left over from repairing a SC board I tend to buy more when it comes to these small SMD parts as they fly off in to the unknown and get lost forever, I have a TNPA5082 that has a 5 and a 7 on it I will pull that off, I have looked but no one has one. I hope that's what the problem is anyway time will tell. Thanks for all your help Flocko

[Hombre]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

Probably best thing to do is to order new M81735FP, and install it.
Or he could try with the old one, but i know i wouldn't do it

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

I think it's not good substitute, at least as far as i can see it from datasheet, altough i'm a newb so might be wrong

Not even a substitute really, different IC

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

Might find that driver on older SC boards too?

[Hombre]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

I think it's not good substitute, at least as far as i can see it from datasheet, altough i'm a newb so might be wrong

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

First thing I would do is look at the pinouts, pin 11 and pin 2 especially pin 11 since it is Vcc on the one you put in 737 ,and NC / grounded on the 735

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

If you like pink, looks great!

I would think using that FET driver would be an issue. was there anything obvious wrong with the M81735?

I don't think they actually blow, I replaced mine but I found nothing obvious with it.

Any scrap SS boards at all from 2009/10 in your pile?

[flocko]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

I have just got round to refitting the SN +SS boards after replaceing all the parts as listed
TNPA5066
Q451 DG502
D481 RFU20
Q661 RJP63F
D451 ES 1G
Q701 MMBTA92 (7E W)
Q702 2PD601ART (3W)
IC773 5N74AHCIG14DBVR
Q818 2SK3018

TNPA5072
RJP30E4 X4
M81735FP I replaced this with a M81737FP as had one to hand
with the boards fitted the set powers up solid green light, and solid green on the SN,but the not so good news is the on screen image see photo it could be the driver M81737FP that I have fitted but not sure? let me know what you think, anyway I am getting there Thanks Flocko

[flocko]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

Well here they are in diode mode readings for Q818 + on first test point D-S=1.770 D-G=!.80 S-G=.286 S-D=.719 G-D=.824 G-S=.208 as i said not much sense to be made of that i have all the parts to change and was going to

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

setting 200ohms and looking for short is ok if expecting a short but what if something is not but low ohms? If you have a replacement foe Q818 I'd fit it. Check resistance is 5.6k gnd to output of IC771 or vcc to gnd on IC773.

[flocko]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

hard to get any diode mode test to make much sense ,i have taken them but i think just to confusing for me anyway, so i just went for a good old 200 ohm continuity test this is what i found Q818 D-S =OL/ D-G=OL/G-S=OL So all open,Q701 C-E=27 ohm/C-B=OL/ B-E=OL so not dead short but short just the same Q702 C-E=OL/C-B+OL/B-E=short, Q603 C-E=OL/C-B=OL/B-E=OL and with IC773 showing low ohm across pins 3-4 my parts list for this is D481 D401,Q661, Q701, Q702 and IC773, so not that much between them,now for the SS

[tw2005]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

So the moral to this story is dont just look at what is there but also look for what is not there , well done so now you have lots of good SN and SS board true Panasonic gold dust well they are over here name your own price. i could box my ones up and send to you, would give you something to do now your on top of the game, help keep your hand in as it were(i joke) anyway well done mate nice one Flocko

Cheers, I think when logic tells you it should be working and it's not, you have to start thinking out side the square.

I simply dont have the refined gear sometimes when things get tight and small.

The irony is, the FET driver I believed was ok but I had one I knew was ok so decided to swap it. If I had left it, that resistor would still have been there.

I only got the extra SN,SS and C boards as a last ditch. I'd touched all of those to do component repair and assumed I'd missed something.

It was my fault that I ended chasing my tail. I did the same thing when i rebuilt the A board. nearly lost a small resistor there and bridged some others creating 9 and 13 blink.

I will say this, to come out the other side with it working as it should is a small miracle. Learnt heaps and very rewarding.

I prefer to fix these cheap as I can, but I also like to show what can be achieved out of the norm especially with A boards.

So it's a good example if you can find an A board the same series and build, a swapping eeproms and flash Ics will simply give you the original configuration of your TV.

[flocko]

Re: PANASONIC plasma TH-P42X20A, SOS4,1,10,6,8

So the moral to this story is dont just look at what is there but also look for what is not there , well done so now you have lots of good SN and SS board true Panasonic gold dust well they are over here name your own price. i could box my ones up and send to you, would give you something to do now your on top of the game, help keep your hand in as it were(i joke) anyway well done mate nice one Flocko