Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Just thought I'd share a final revelation. After 2 weeks of normal operation the TV failed again and just wouldn't start up. As I feared, working on the TV in my Sisters house wasn't exactly ideal!
Anyway, it looks like I finally managed to diagnose the root cause of the issue. I don't believe the TEA1611T chips and associated capacitors ever had anything to do with the issue. After taking the back off the TV and probing around I discovered a strange voltage present on pins 1-3 of...
ljnash
Member
Last Activity: 12-26-2020, 06:19 AM
Joined: 12-27-2016
Location: Walsall, West Midlands
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
I'm going to take your advice
Far easier to change them now than when it's at my Sisters!
I've ordered some 0603 1uF X7R 50V capacitors. If I'm going to change them, might as well go for the best I can. I'll post to let you know how I get on.
Thanks again.Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Hi tw2005,
Interesting question, I have an interesting answer (or possibly just a long answer)!
>> Short answer:
No I didn't replace the original ceramic bypass cap.
>> Long answer:
I did remove the ceramic cap from the MC301 board on the second P(MAIN) board to measure its capacitance and to check it wasn't shorted in some way. It measured just shy of 1uF (same value as people supply with repair kits) so I assumed...Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Good news everybody, another Panasonic Plasma lives again!
Just wanted to share the good news with the forum and take the time to thank everyone who offered me advice over the last 5 months!
I'm still not really sure what the issue was with this TV but after spending some time looking at the F_STBY_15V (which seemed to take quite a while to reach 15V) I decided to take another look at the non-working P(MAIN) board I'd bought off eBay some months ago. I was working...Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Hi tw2005,
Well, I've received my "working" replacement D board but it has obvious damage to one of its inductors. Looks like it should still work electrically but it'll be going back! Did a quick test with this second D board to see if there was any change and unfortunately the TV behaves exactly the same as before.
I've spent the morning getting back into the detail of the schematics as I've found myself looking at the A-Board again.
The A-board...Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Hi tw2005,
Thank you for the reply and the power point presentation it's appreciated.
I tried disconnecting A5 and A7 but that just resulted in an even quicker shutdown of the P-board.
I decided to spend some time reading over the presentation (pages 22 to 29 in particular) and I believe I may have a new lead.
According to "Power Supply Sequence (6/8)" on page 27 the D board is meant to assert Panel ON/OFF to instruct MC701 to...Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Hi all,
Does anyone one else have any suggestions before I give up on this repair.
Without further information about power up sequences I don't see that I'm going to be able to get the bottom of this fault.
Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Thanks for the suggestion. I've just gone round unplugging and re-seating connectors but no joy I'm afraid.
I did notice something interesting however as a result, when I press the power button on the front of the TV I though it would first go into standby and then power on with the remote (Panasonic's tend to do this unless you push the power button in quickly). This set however appears to be trying to turn on immediately (rapid green flashing light before red flashing error code),...Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Thank you both for your replies.
[B]@freakaftr8[/B], I've double checked the transformer fuse, which looking at the schematics only appears to be present in transformer T201 (VSUS transformer). I measured on the top side of the board between R251 and R252 and measure ~0 ohms for both of my P(MAIN) boards. So the fuses look ok.
[B]@vinceroger69[/B], I've checked the MC201 and MC301 boards to see if they were the wrong way around. I was very careful not to mix them up...Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Hi all,
Just wanted to post an update, unfortunately I'm not really making any progress!
I still really need input from someone that knows what the correct power-up sequence is for this model of TV.
I made the decision to pay for a copy of the exact service manual for this TV just to be sure the board schematics I was following were correct. I've attached the manual so that others in the forum can more easily get hold of it. Hopefully it may prove useful to someone...Leave a comment:
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Re: Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Hi Moreno and tom,
Thank you both for your replies.
[B]@Moreno[/B], I haven't tried freezing the TEA1611 chips on the MC201 and MC301 boards as I skipped ahead and just replaced them both with new IC's. I de-soldered the two boards and took them into work on the weekend to do the soldering under a microscope (as you say they're pretty small parts!). I'll try and get hold of some freeze spray to see if the replacement part on the MC201 board is acting up. I'll also look...Leave a comment:
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Panasonic Plasma TH-46PZ81B, 10 Blink SOS (Doesn't appear to be TEA1611T chips)
Hi all, this is my first post so please go gentle on me!
I very recently picked up a Panasonic TH-46PZ81B (46" plasma 2008 vintage) with a known fault (10 blinks of the red power light after pressing the front power button) that I hope to repair so that I can give it to my sister. My sister is still using a 28" CRT in 2017! I'm hoping my sis gets a new TV and I get the satisfaction of bringing a plasma back to life!
I was hoping that the cause of this 10 blink SOS would be the TEA1611T chip on either the MC201 or MC301 located on the P(MAIN)-Board. This... -
Re: New Members - please post your introductions here
Hi All. I work for a small electronics firm in the UK and have a couple of years experience of diagnosing electronic faults and replacing surface mount components. I like to dabble in electronics as a hobby as well, so I'm trying to broaden my electronics knowledge. Hopefully this is the place to be!Leave a comment:
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