Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

[DLinkOZ]

I have two of these 2009 Panasonic plasmas - a 50" and a 42". The 50 inch is great, but the 42" now gives the 10 blink sos code. The service manual claims this to be a fault in the A board, but I think otherwise. When I plug in the TV, it's silent and I get the 5v standby. When I hit the power button, I get 2 quick clicks and a 3rd no more than a second later. If I unplug power going to the SC board, it changes to an SOS7 and the 3rd click takes about 5 seconds instead of nearly immediately.

Connector SC2 on the SC board shows the Vsus and ground to be shorted together. I isolated the buffers from the board, and it's still shorted (see pic). Testing one voltage at a time due to the short window, I see the following:

On the power board
Connector P6 - 15vs is good
Connector P7 - stby5v is good
Connector P25 - stby5v, 5vc, 15vc are good
Connector P2 - Vsus is good (shows 191v and panel sticker shows 192v)
Connector P11 - 15v is good

So I'm thinking it's the shorted SC, not the A board. Thoughts and other input?

[tw2005]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

I'd go SC board. The fact it drops the 10 blink after it's disconnetced. besides, you know the Sc is bad and needs replacing so you might as well replace it.

If you disconnected SC2 SC20, SS11, P35 and the 3 white ribbons at the A board the set should turn on and hopefully no blinks which would prove the A board.

Just make sure there's no residual power on any of the power cables before you hook them back up so nothing gets spiked especially P35.

[DLinkOZ]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

Yep, I'm going to grab the buffers, too. Is there a good way to test the A board without actually replacing, considering the rarity and price of it?

[Prop1]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

Yep, I'm going to grab the buffers, too. Is there a good way to test the A board without actually replacing, considering the rarity and price of it?

I don't think its a buffer SU/SD based on what I went through on my Panasonic. I used this guide to troubleshoot mine: http://tvrepairtips.org/files/tip/29..._pdf_11669.pdf

I found like you the SC to be shorted and 4 31F131 blown.

[DLinkOZ]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

Right, I believe it to be the SC. However, what I've read here is that it's typically a good idea to replace as a set as one can damage the other. The buffers are just too cheap to not include them, just a bit of insurance.

*EDIT*
Well, check that - I can see bad buffers damaging a good y-sus/sc board. But could the opposite happen also?

[zBest]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

I'm a new user to this forum and have found some very helpful information. Thank you.

I have a Panasonic 3D Plasma TC-P54VT25 which is throwing the 10 blink code at power on. I do not have the 10 blink code when power is connected to the set.

I found a manual on another posting and ran the diagnostics. I found that I have a short to ground on P11 pins 1 and 4. Manual indicated this is a VSUS and P15V issue. Vda checked out good.

I ran the diagnostics for the VSUS and determined that the SC board is suspect.

I ran the diagnostics for the P15V and found a short on Pin 1 of connector P6. Which makes the P board suspect also. I noticed that the SC board is also part of the P15V troubleshooting but because Pin 1 of connector P6 is shorted the troubleshooting ends at the P board.

I imagine I could have two bad boards, SC and P. Is that common or likely? If I replace the SC board only to start with is there risk in damaging SC board due to a bad P board?

I'm fairly new to troubleshooting tvs but willing to learn.

Thanks for the help. This is my first post, sorry to hijack the thread.

[tw2005]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

Yep, I'm going to grab the buffers, too. Is there a good way to test the A board without actually replacing, considering the rarity and price of it?

I'll refer you back to my post #2 as I gave you a method which should prove whether the A board is triggering any SOS blinks.

[tw2005]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

I'm a new user to this forum and have found some very helpful information. Thank you.

I have a Panasonic 3D Plasma TC-P54VT25 which is throwing the 10 blink code at power on. I do not have the 10 blink code when power is connected to the set.

I found a manual on another posting and ran the diagnostics. I found that I have a short to ground on P11 pins 1 and 4. Manual indicated this is a VSUS and P15V issue. Vda checked out good.

I ran the diagnostics for the VSUS and determined that the SC board is suspect.

I ran the diagnostics for the P15V and found a short on Pin 1 of connector P6. Which makes the P board suspect also. I noticed that the SC board is also part of the P15V troubleshooting but because Pin 1 of connector P6 is shorted the troubleshooting ends at the P board.

I imagine I could have two bad boards, SC and P. Is that common or likely? If I replace the SC board only to start with is there risk in damaging SC board due to a bad P board?

I'm fairly new to troubleshooting tvs but willing to learn.

Thanks for the help. This is my first post, sorry to hijack the thread.

I have not read a lot of VT series with this fault but certainly the V or G20/25 series have an issue with the SC board failing and shorting. can produce 10 blink. TNPA5081 sc board, quite often SC2 will be shorted also. would be better to start a separate thread for your fault.

I would disconnect SS11 and Sc2, SC20. recheck Vsus at p11, p2, and your 15v again and see if still shorted. Then check Sc2 see if shorted and also SS11 vsus for short. I'm thinking SC will be the cause. you will also have to check the SD/SU for shorts before you replace the SC as they can fail too at the same time. generally they survive but not always but if they are short then they can/will blow the Sc again.

[tom66]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

You can test the buffer board, like so:
https://www.youtube.com/watch?v=51SZsfH60EY

[DLinkOZ]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

Excellent, as always. I'll watch through the video before finalizing my order.

And tw2005, I completely missed your test for the A board. I'll do that as well.

Thanks to you both!

[DLinkOZ]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

So I pulled the cables you listed, tw2005, and the TV is up and running and I can hear the audio via HDMI 1. No video, obviously, but I think that pretty much confirms the fault. Again, thanks!

[tw2005]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

So I pulled the cables you listed, tw2005, and the TV is up and running and I can hear the audio via HDMI 1. No video, obviously, but I think that pretty much confirms the fault. Again, thanks!

you're welcome

[DLinkOZ]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

New SC board was delivered today, and the TV is now up and running. Moral of the story - don't always believe the service manual! A $19 SC board versus the $100+ mainboard (according to the manual's definition of a 10 blink SOS).

[tw2005]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

New SC board was delivered today, and the TV is now up and running. Moral of the story - don't always believe the service manual! A $19 SC board versus the $100+ mainboard (according to the manual's definition of a 10 blink SOS).

Holy cow, you picked up a sc for that$ That's a score. Most SC boards are dearer than that.

[DLinkOZ]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

Yep, and that's why it took me so long to get it running - I held out, searching daily for the best possible deal. When I saw a seller pop up with 5 of them for $11 + $8 shipping each, I jumped on it!

[DLinkOZ]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

If anyone else is in the market, he still has some left (I don't understand how!)

http://www.ebay.com/itm/121359780743...%3AMEBIDX%3AIT

[tw2005]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

If anyone else is in the market, he still has some left (I don't understand how!)

http://www.ebay.com/itm/121359780743...%3AMEBIDX%3AIT

Well I'd love one , but no O'seas postage. My TV uses the same board, already done 1 SC at 2500Hrs.

[9302z28ss]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

would this board work for a tc-p42s30? if so im ordering now

[DLinkOZ]

Re: Panasonic TC-42PX14 10 blinks - I don't think it's the A board!

Yours appears to be a completely different beast.