Panasonic TX-P42S10B

[noledud]

Panasonic TX-P42S10B

Hi All been away a while waiting for parts and getting side tracked, found this Panasonic nearby and never having one for repair wanted to give it a go

7 Blinks wont power on

The seller was using daily until sometimes is was hard to turn on sometimes

he told me this went on for a while all he did was unplug it then try again

until recently it wont come on at all

so i checked it and looked untouched and clean and screen good. He had bought a new one and just wanted rid

I paid more than i would have liked then took it home

the pics say it all for my first panasonic -- WTF

[Agent24]

Re: Panasonic TX-P42S10B

Often a power-on problem that gets slowly worse is bad capacitors.

But what interests me are the burn marks on the heatsink!

[noledud]

Re: Panasonic TX-P42S10B

im more worried about the missings FETs missing from the y-main lol

[noledud]

Re: Panasonic TX-P42S10B

i think the person i bought it off forgot to say "hes tried repairing it but couldn't so then sold it"

[Agent24]

Re: Panasonic TX-P42S10B

Only looked at thumbnails, didn't notice those missing FETs! Hopefully those were the bad ones (That he probably blew out from whatever mistake caused the heatsink to get burnt)

[tw2005]

Re: Panasonic TX-P42S10B

I think SC failure is fairly common in these. there are a couple of Ebay repairers of the board and some here have done that since these are pretty much impossible to find.

not sure how you'll go now with the SC messed with as most repairers will not attempt a repair. i'd try and find out what exactly the previous person had done.

It may just be that the shorted IGBts have been removed but if they've tried replacing them and powered it up, other damage may have occurred.

they probably bailed out on cost. I think fro memory a Sc repair is about $130 plus you should resistance check the SD/SU as well just in case.

[noledud]

Re: Panasonic TX-P42S10B

exactly what i thought this is a can of worms

[tw2005]

Re: Panasonic TX-P42S10B

So you need TNPA4829AD or TXNSC1EKUU.

Inside the rear cover are there corresponding burn marks for what we see on the PSU?

You may want to check fuses and FETs on that PSU and see if he's blown it.

It may be possible to power this set up to confirm PSU and A board but will require isolating all the other boards.

[tw2005]

Re: Panasonic TX-P42S10B

Is 43quid a lot of money in your speak?

[noledud]

Re: Panasonic TX-P42S10B

It is a TNPA4829AD

there are no marks on the rear cover at all

its not alot no, so can i narrow it down you think ?

[tw2005]

Re: Panasonic TX-P42S10B

It is a TNPA4829AD

there are no marks on the rear cover at all

its not alot no, so can i narrow it down you think ?

should I'm just trying to upload manuals now.

have you tried turning this on yet as is not that I want you too?

[noledud]

Re: Panasonic TX-P42S10B

the seller powered it on for me lol

[tw2005]

Re: Panasonic TX-P42S10B

might be quicker if you go to TOM's links in the reference library. Nothing but trouble last 2 days with uploads.

looking for 2009_PDP_Troubleshooting_Handbook_TTG090507CP-REV091117

not sure if he renames them.

If you think the PSU is ok, disconnect 3 white ribbons at the A board , P35, SC2, SS11 and power up and confirm if it starts ok and stays on. This will confirm PSu and A.

then I'd resistance check the SD/SU boards.

[tw2005]

Re: Panasonic TX-P42S10B

the seller powered it on for me lol

That was nice of him, clearly he knew what he was doing(not)

Well, I guess that confirms there's hope.

If you disconnect all of what I posted hopefully it will just turn on.

I'd expect SOS7 with a Sc in that condition.

[tw2005]

Re: Panasonic TX-P42S10B

Finally,

Slide 25 on, resistance check SD/SU,

Slide 27, boards disconnected from the SC, all the instructions are there.

note: Unplug connector SU41 and SU11(interconnecting ribbon SU/SD. Remove the 2 floating ground screws from the SU board

If they come up good you might get out of it for 43quid.

[tw2005]

Re: Panasonic TX-P42S10B

This post may be of interest. MSAUDIO replaced just the blown IGBTs and a diode (Q402, Q421, Q422, Q661 & D865 ) and got one going which is pretty lucky and cool.

https://www.badcaps.net/forum/showth...ght=TX-P42S10B

Are these all that are missing? D622,Q401,Q402,Q421,Q422,Q661. Be interesting to check D865 next to Q622 and see if short cct.

Any chance you can check to see if the guy has the pulled parts, some may not have been bad, like D622 or Q401 /402. Could be handy in case D622 is hard to find and you want to have a gamble fixing this.

Actually TN245 got his going, reported replacing same and fixed his too.

I have one of these boards in, and your parts list is a great help as we can order direct from Panasonic, glad someone out there can get onto the manuals..

We have the board with Q402, Q421, Q422, Q661 & D865 all shorted, disconnecting them has removed all shorts from the board, so hopefully replacing them will cure the problem.
(I think the parts list precedes the parts with 16, eg Q16402... ?)
The SC board from Panasonic is £197.28 trade price

Yes I did replace those blown components, and that was all it was, It cured the fault and got all the components direct from Panasonic, they did not cost very much at all.

I just got around to finishing this repair and testing and I'm happy to report it works. On my board it was Q401, Q421, Q422, Q661 & D865 that were shorted. Q402 was actually ok although I replaced it anyway as I removed it before Q401.

IGBTs were from utsource.net, total cost $12 (USD) + $4 shipping. Took a couple of weeks to arrive. The diode was that BOURNS, CD214A-F1400 from ebay which was £1.37.

The 30G123s and the RJP6065 looked brand new as far as I could tell. Now that you mention it I was a little surprised that the 2PG011s both had legs already bent into position and cut the correct length. You think they're selling pulled parts as new?

I was pretty pleased when I heard the sustain boards buzzing instead of parts exploding yes.

Some parts info should you need.

snipped................Q16402, 2PG0090000R (2PG009) Panasonic IGBT; VCES (V): 510; Ic (A): 40; tf (µs) typ: 0.19; Vce typ: 1.95; Package: TO-220FN

Q16421, Q16422, = GT30G123 (30G123) Toshiba IGBT; VCES (V): 430; Ic (A): 30;(200A Peak pulse); Vce typ: 2.2; Package: TO-220FN


Q16661 = RJP6065DPP-90-T2 RENESAS IGBT; VCES (V): 630; Ic (A): 40; tf (µs) typ: 0.45; Vce typ: 1.8; Package: TO-220FN
RJP63F3A would work. RENESAS

D16865 = RF101L4S TE25, ROHM 400V 1AQ16701, = MMBTA92 NXP , PNP high-voltage transistor 300V 0.1A

Q16702 = 2SD0601A0L,,2PD601ART, NXP , 50 V, 100 mA NPN general-purpose transistor

Q16501,521,531,551,762, = SANYO, PNP / NPN Silicon Transistor, CPH5524-TL-E

Q16647,607,608,817,818,874 = ROHM , Small switching N-channel MOSFET (30V, 0.1A) 2SK3018T106 (2N7002 will work, watch the package sizes)

IC16771,= TOSHIBA TA78L05F(TE12L,F) , 78L05

IC16464, IC16465 , IC16773 C0JBAB000715 = TOSHIBA TC7SH14F (TE85L), (Texas Instruments SN74AHC1G14DBVR)

[noledud]

Re: Panasonic TX-P42S10B

Yes all the missing ones are D622,Q401,Q402,Q421,Q422,Q661.

Just as you suggested, im about to test the ps and i will check for that short aswell

Cheers

[dcapper]

Re: Panasonic TX-P42S10B

What's with the Panasonic project parts tv? I had the exact same problem with a X2. Missing chips on boards. I replaced the A board. The P board was already replaced. Ordered an SN and SC boards. Nothing left but the buffers.

Has shopjimmy or paylesscomponents got any replacement boards?

I tried to repair what I had too and I gave up and found boards. But haven't received them to try them. TW has been more than helpful with my trouble too. Check out my thread. It has great info too.

https://www.badcaps.net/forum/showthread.php?t=35362

[noledud]

Re: Panasonic TX-P42S10B

Hi all sorry for the delay in getting back on this one

the power board is ok

the SU has a resistance of 1.4 and the SD has 0.4 so long as im measuring right

so i take it that means im going to need SU SD and SC

[tw2005]

Re: Panasonic TX-P42S10B

Hi all sorry for the delay in getting back on this one

the power board is ok

the SU has a resistance of 1.4 and the SD has 0.4 so long as im measuring right

so i take it that means im going to need SU SD and SC

More info, units of measurement e.g. ohms, and the test points.