I've read the threads and replaced the ceramic resistors, IC301, and almost all the caps. I read that I should replace R103-R113. My eyes are not that good but it looks like some of the resistances are off. Is there any other parts to look at? And does someone know all the resistances for those resistors? Elektrotanya doesn't have a schematic for the 50PK550. Unless I use the schematic for the 50PK750?
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50PK550 EAX61392501 Shutting Off
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Re: 50PK550 EAX61392501 Shutting Off
I did that a while ago, not sure if it's the exact same board of yours.
https://www.youtube.com/watch?v=NmifFBrB8BM
I should still have one of these boards at home, I'll have a look.
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Re: 50PK550 EAX61392501 Shutting Off
Originally posted by paulstef View PostI did that a while ago, not sure if it's the exact same board of yours.
https://www.youtube.com/watch?v=NmifFBrB8BM
I should still have one of these boards at home, I'll have a look.
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Re: 50PK550 EAX61392501 Shutting Off
Originally posted by tw2005 View PostYour Video?Last edited by attainteddragon; 09-18-2017, 04:35 PM.WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?
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Re: 50PK550 EAX61392501 Shutting Off
Originally posted by tw2005 View PostYour Video?Last edited by paulstef; 09-18-2017, 08:08 PM.
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Re: 50PK550 EAX61392501 Shutting Off
Originally posted by dcapper View PostI used a magnifying glass. Here's my resistor sizes I think. I hope someone can confirm:
R103: 2403
R104: 2403
R105: 1503
R106: 1503
R107: 1003
R108: 6803
R109: 6803
R110: 6803
R111: 6803
R112: 6203
R113: 5603
I like this board because it can be tested completely independently from the rest of the TV by applying a signal to RL_ON and M_ON, don't forget to put a load on VS when starting it up.Last edited by paulstef; 09-18-2017, 08:19 PM.
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Re: 50PK550 EAX61392501 Shutting Off
watch out for cracked / dry solders. Just found a shed load., all along the heats sinks. Very dry and nasty, thought it was a fix but still dead, maybe something has been damaged. Mine actually ran . Was told needed PSU , then suddenly it just would not turn on, click on then off immediately.
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Re: 50PK550 EAX61392501 Shutting Off
Right, get your bet set of goggles and good light. Worst board I've seen for a long time. Not something you see in the Panasonics much but after another 20 or more additional joints resoldered it's running.
Pay close attention to all heatsinked parts and all transformers pins etc. Some were so dry the solder completed flowed off the joint on re-heat. Genuine cold joints. probably worth a fule desolder and fresh leaded solder.
I was even hitting a lot of smaller stuff and links, some had very little solder and looked ordinary.
I have another with the same PSU, meant to be faulty, I bet it's bad PSU solders too, as it has not faulted yet which is what this one presented. trip home must had sk
shaken a few joints into contact again.
Good luck with yoursLast edited by tw2005; 09-24-2017, 06:01 AM.
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Re: 50PK550 EAX61392501 Shutting Off
You blokes still alive?
Just fixed this one.
So this one. stdby 3.4V ,but at RUN= 5.1 v . 17v was present, no Va or Vs
Relays just clicking.
Resistors good, check all solders and reflowed. Nothing shorted,
Swapped out all main Ic's from good board, - no change
Started swapping optos, no change..................until I changed PC101,102. Can't say which one but now it's running.
Funny thing I started with an opto swap , just the wrong one based on a mention somewhere in another thread.
They're nothing special real common garden variety opto you see a lot. chances are if you have some boards laying around you'll have something
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Re: 50PK550 EAX61392501 Shutting Off
Not sure what happened but I remembered I swapped 2 FETS from another which were 3Amps less. put the 15A ones back in brushed up a couple of spots and a clean. Farking thing, back to clicking but only does 3 or cycles then quits.
Over it TBH.
Tried reversing back to where it was working, nup. Stuff it.Last edited by tw2005; 10-02-2017, 12:05 AM.
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