Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Two diodes and 6 transistors were replaced, that is what was in the kit. Used new mounting hardware which had the lock-washers on them. I used a fiberglass pen brush to clean the ground contacts where the screws attached the board to the main chassis of the TV. The only thing done with SS board was to confirm that after SS11 was disconnected, that there was no direct short on that connector at the SS board.
MTWallet
Member
Last Activity: 08-04-2015, 03:49 PM
Joined: 07-02-2015
Location: Austin, TX
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Well, unfortunately the repair didn't hold. After a few more hours on the TV, there was a nice sharp pop last night, and back to solid red LED, or 14 blinks if you hold down the power button. I will tear it down again and see what's up. If its the SC board again or something else.
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Got everything re-installed last night after testing the SC41, SC42 & SC46 connectors as well as the flexi-cables that attach to the SU/SD boards. Also did the isolation test with SC50 jumpered. Nothing seemed amiss, so I plugged it all in proper and gave it a go... SUCCESS!! TV came on and displayed properly, thanks to Terryfictv, tw2005 and flocko for your assistance. I remounted the heatsinks with thermal tape and silicone, as well as adding sinks to the other three transistors that did not have them. Time will...Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Thank you kindly. I have been using this one, not sure if it is hiding here on the forums somewhere or not....Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Oye! So you are talking about the copper colored ribbon cables that wrap around and connect to the SU/SD boards on the very left edge? If that's the case, I was totally not reading what you were saying right....Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Thank you Terryfictv, but neither google nor the site search helped me with those terms.
I did find a troubleshooting guide for 2012 TC-P50ST50's that seems to run down the same as what tw2005 posted as shown below. I think this is the same info.
tw2005, I think I finally found your post for isolation test and buffer checking. Is this it?
[URL="https://www.badcaps.net/forum/showpost.php?p=522275&postcount=11"]https://www.badcaps.net/forum/showpost.php?p=522275&...Last edited by MTWallet; 07-13-2015, 11:28 AM.Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
tw2005, thank you for your reply. I searched for about an hour last night looking for your info on testing shorted SD/SU boards. I found a post where you had posted a photo of an SD board showing to test at connector SD42. The points were labeled VFO, VSCN_F and VF5V, also showed to point VFG (GND). Is this the test your are talking about? Do I test the same points on the other two white connectors (SD46 and SU41)?Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Kit had the right number of parts for my board. 6 transistors and 2 diodes with 6 resistors. The shopjimmy site shows that kit in the search, but when you put it in the cart, it is the kit for the v2 board, which is what I have. Got everything put back on the board last night, but didn't get it in the TV yet. No short at SC2 anymore and everything at those R & D locations ohm out as they should. I.E. the tabs of each group of R's & D's show 0 ohm to each other, and the legs that lead to the resistors have 0 ohms...Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Thank you flocko and Terry, I went ahead and hot air removed all the Q's and D's last night. I will test them and hold on to any that are good for future spares. The heatsinks were silicone blobbed and also thermal taped, so after razoring the silicone away from the side of the heatsink, they twisted off without a fight. I tested the R's afterward and they all read 7.6 Ohm, which should be about right as the replacements show to be 7.5 Ohm. Will get the solder pads cleaned up tonight and hopefully get the new parts installed...Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Do you have a specific recommendation for testing the FETs? I only have experience with smaller NPN/PNP transistors.
As for the heatsinks, they are glued, not screwed. I may try the freeze board and try to pop off with razor blade method that seems to work well on epoxied HS's if they don't seem to want to budge.Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
Thanks for the reply! I'm all for only replacing what is broke, but not sure which pieces are bad at this point. I got a package from shopjimmy with 6 parts of one number FET and 2 parts of another FET, also a small strip of the resistors. There are no diodes, unless they started making them look like FET's! Locations shown on the packaging of the kit are Q401, Q402, Q403, Q421, Q422, Q423 for the 6, and D401 & D421 for the 2. The resistors show to go at R401, R402, R403, R421, R422 & R423. On my board, Q421-Q423...Last edited by MTWallet; 07-10-2015, 03:42 PM.Leave a comment:
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Re: Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
So, should I assume no responses here means I'm on the right track?
Still looking for best way to remove those heatsinks though.
Got my parts in and am ready to start swapping parts tonight.
Thanks!Leave a comment:
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Panasonic TC-P55ST30 SNAFU'ed, SC board blown, I think...
I've done a lot of reading the last few days to try and make sure I'm on the right track. Just asking to make sure there isn't something else I should check before diving in.
Kiddo was watching the telly the other day when it went out. He wasn't able to describe the exact circumstances, just that the picture went away. Older daughter tried to help by pushing power button and got the 14 blink code. I followed the shop jimmy diagnostic on youtube and found SC2 is shorted. No short on P board when the cable is disconnected. TPSC1 on SC board is not showing a short, so I did not diagnose... -
Re: New Members - please post your introductions here
New member here, thanks for the forum! Dabbled in many things electronic from game consoles to scrap building things from internet schematics. Found some knowledgeable posts here regarding trying to repair my TV and would like to get some more information before I dive in. Will be my first foray into TV repair as I have always been somewhat wary of them due to the extremely high voltages in the past.Leave a comment:
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