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

[flocko]

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

Thanks for part numbers,have been looking for the TC7SH14F no one has this any were over here same with the DSA2001S0L, the others i can get for about £1 each over here or £1 per 100 from China,i will see if i can get some TC7S14F and the DSA2001S0L also from china i am in no rush to get the set running Flocko

[tw2005]

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

Yes i have seen them,do you have a parts list for this board as i am thinking that if i change IC733/Q818/Q603/and Q702 that should tick most of the known faulty components what do you think, as Q818( 2SK3018 ) is less than a £1 that with the other parts i could get out of this for under £10 Flocko

Only list is what you'd have in the service manual, then a matter of either searching within the forum as i have listed some I have worked out or look at the markings and try google. Q603 is a real number as it is a panasonic product. the others will be found in the 5081 repair thread I did.

IC16773 TC7SH14F, Toshiba , Schmitt inverter ,marking HA
Q16701 MMBTA92 NXP (7E W)
Q16702 2PD601ART NXP (C3 W)
Q603 DSA2001S0L

If you get stuck by all means I'll see if I can ID it for you.

[flocko]

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

Yes i have seen them,do you have a parts list for this board as i am thinking that if i change IC733/Q818/Q603/and Q702 that should tick most of the known faulty components what do you think, as Q818( 2SK3018 ) is less than a £1 that with the other parts i could get out of this for under £10 Flocko

[tw2005]

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

I see in the States some one on Ebay has repair kits for the TNPA 5066 and TNPA 5072 does not list all part but for the SN Q401/Q402/Q421/Q661 IC7xx/,transistors and diode 9 parts in total, and for the SS just 5 parts, they say will fix 90% of faults

I see a SS/SN for sale on Ebay UK 50 quid. Was 65 but from a smashed TV. Whether they're good or not and wty??

[flocko]

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

I see in the States some one on Ebay has repair kits for the TNPA 5066 and TNPA 5072 does not list all part but for the SN Q401/Q402/Q421/Q661 IC7xx/,transistors and diode 9 parts in total, and for the SS just 5 parts, they say will fix 90% of faults

[tw2005]

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

yes i will find S/fast recovery diode off something( 600v 1 Amp) have a lot of old LG Sus boards sure to have them on,will leave it till my IGBTs get here for the SS board, what do you make of the readings on IC773? Thanks again for your input Flocko

I trust your meter is of reasonable quality so it's off compared to my working board.

A shorted Q661 points me to the inverter cct and i'd take my time being real careful looking for shorted transistors and Q818 did not go short but was faulty on the 5081.

I'd be suspicious of Q818, 2SK3018 but a 2N7002 will also work. Package size is a pain though, smaller than the others.

[flocko]

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

yes i will find S/fast recovery diode off something( 600v 1 Amp) have a lot of old LG Sus boards sure to have them on,will leave it till my IGBTs get here for the SS board, what do you make of the readings on IC773? Thanks again for your input Flocko

[tw2005]

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

Did not have to look to far D451 goes across C-E on Q451 and it reads short both ways just need to find a replacement

That could be handy info if i try repairing this. It was going to be a toss up on whether to start at the Transistor or diode. i have found though generally when those IGBTs fail, they're shorted on all three legs.

Got any scrap boards to scavange?

D1FK60-5073

[flocko]

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

Did not have to look to far D451 goes across C-E on Q451 and it reads short both ways just need to find a replacement

[flocko]

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

well here is were i am at replaced D481(RFU20) +Q661(RJP63F) and removed and tested Q451(DG502)the short is not on the component but shows across the collector - emitier pad on the board so have left replacing this for now but have not returned it to the board, i rechecked in diode mode IC733 and still showing the .146/.238 it was before the replacement of Q661, the thing is now is there allways this short across Q451 or is something else short ( diode) ?

[flocko]

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

i dont know what that is telling us but will retest when i replace Q661,you used a DG502 for the 501 i will do the same as i have no 501s if it worked for you should be Ok,i will try to get the parts changed tomorrow and let you know if it changes the readings on IC733, i have a new RFU20 to replace D461 and new JRP63f for Q661

[tw2005]

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

i have the RJP63F as these are used in lots, am out of DG501s can get 502s?With regards IC733 in diode mode com to Pin 3 - Pin 4 shows .146,com to pin 4 - Pin 3 shows .234 ? but thats with the shorted Q661 still in the board

On the dead board I'm getting short(.07), on working board 0.6 and .9 charging to a bit over 1.0.

My Q661 was short all 3 legs.

[flocko]

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

i have the RJP63F as these are used in lots, am out of DG501s can get 502s?With regards IC733 in diode mode com to Pin 3 - Pin 4 shows .146,com to pin 4 - Pin 3 shows .234 ? but thats with the shorted Q661 still in the board

[tw2005]

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

Thanks Tom Will a DG502 be Ok in place of the DG501 as i am out of 501s but can get my hands on DG502? when i these faulty parts are replaced and with the SS board out will the green LED light up on the SN to show if its working

have you read post #31? The LED will light for as long as it takes for the SOS to trigger which is pretty much straight away. This bad SN I have it lights momentarily, not full brightness.

Not sure how much of a guide that will be for you.

Also, this cct design and parts, are very close to the 5081. With Q661 shorted I'd be wary of IC773. What do you get in diode pins 3 - 4 ?

Got any ymain from Samsung 42C450 series? RJP63F3 on them.

[flocko]

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

Thanks Tom Will a DG502 be Ok in place of the DG501 as i am out of 501s but can get my hands on DG502? when i these faulty parts are replaced and with the SS board out will the green LED light up on the SN to show if its working

[tom66]

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

If no shorts from e-g or c-g then driver ICs should be ok

[flocko]

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

Well i have found Q451 reading short C-E (DG501), D481 short (RFU20), and Q661(RJP63F) shorted C-E but SMD transistors look Ok have not taken any out yet will now look at the SN se what gone on that

[tw2005]

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

will have to check but i know Q451 is shorted on the SN and one RJP63 showing short on board and one RFU 20 also but need to retest off the board could be short on Q451 showing across the others. this will be the first time for getting parts from Japan as i normally buy from China, i find i can get ten or more components for the price of one over here, so i order the parts i use the most in bulk and normally have what i need to hand, just waiting on the RJP30E for the SS to come, i have the rest Flock

Might have to start a new thread. I can see this becoming messy. Just having a closer look at the bad board I received. Starting to sound like it's failed like yours, also check out the SMD transistors Q702, Q818, Q663.

[tw2005]

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

Something Else I should mention. SOS8 , can be SN board, in this instance in cct Q451 C-E short, D481 short, Q661 shorted plus smd transistors as well and more .

[flocko]

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

will have to check but i know Q451 is shorted on the SN and one RJP63 showing short on board and one RFU 20 also but need to retest off the board could be short on Q451 showing across the others. this will be the first time for getting parts from Japan as i normally buy from China, i find i can get ten or more components for the price of one over here, so i order the parts i use the most in bulk and normally have what i need to hand, just waiting on the RJP30E for the SS to come, i have the rest Flock