Hey all!
I am making this post for any future folks finding issues with this Panel. There are a few threads that had some good details but no follow up from the OP's on the outcome of their fixes.
So here is what we got.
Panasonic TC-P42GT35 1080p 3D Smart Plasma Display.
The unit when powered up. It was only giving me a 1 blink SOS, So I broke the panel down and did the following steps to figure out it was a blown SC board (pretty typical failure on these newer Panasonic plasma displays).
Anyway so I pulled the back off and visually inspected the boards (the seller told me he heard a loud firecracker pop when the panel died) so I was expecting to see some carnage.... None was found.
Next step I disconnected P2 and P11 (SC and SS power plugs) and then I disconnected plug 35 on the power supply (this feeds power to the bottom C buffer boards)
Then I proceeded to disconnect the 3 white flat ribbon cables being fed to the mainboard.
This test is to determine SMPS and Mainboard functionality. The TV was able to power on and the red LED stayed solid. (This is good)
Wait about 20-25 min before connecting anything or wait till voltage drops below 25v this keeps the boards from being damaged.
Next I reconnected all the plugs except the P2 plug going to the SC board this also includes the ribbon cable from the SC to the Mainboard (this must be plugged in to allow the SOS detection to report a SOS 7 failure).
After connecting everything but the SC board power feed the panel turned on to display a SOS 7 fault, this is what we are looking for this means the SC board has a possible short. One other way to tell is to put your DMM into Diode mode and look for low or zero resistance or a beep. This means the SC board has failed.
After this test is complete again wait a few min to allow voltage to discharge and then reconnect the SC board power feed connector.
Once this is done power up the unit again and you should see a SOS 4 blink.
Also visually inspect your SU/SD IC's for any possible faults/open circuits or blow holes.
These steps apply to most Panasonic Plasma displays. I would also like to thank Tom66 and TW2005 I have learned quite a bit about plasma displays and troubleshooting from you two
Since I cannot find the parts to repair this SC board or a repair kit I am sending it to ModusLink for them to repair it.
Also I do have a question, this is the first plasma panel I have ever seen with out a voltage legend inside the unit. I have no idea what the voltages are supposed to be, I did take them and I believe it was 202/60. I looked everywhere for a sticker but was not able to find one.
I will update when I get my repaired SC board.
Thanks for reading!
I am making this post for any future folks finding issues with this Panel. There are a few threads that had some good details but no follow up from the OP's on the outcome of their fixes.
So here is what we got.
Panasonic TC-P42GT35 1080p 3D Smart Plasma Display.
The unit when powered up. It was only giving me a 1 blink SOS, So I broke the panel down and did the following steps to figure out it was a blown SC board (pretty typical failure on these newer Panasonic plasma displays).
Anyway so I pulled the back off and visually inspected the boards (the seller told me he heard a loud firecracker pop when the panel died) so I was expecting to see some carnage.... None was found.
Next step I disconnected P2 and P11 (SC and SS power plugs) and then I disconnected plug 35 on the power supply (this feeds power to the bottom C buffer boards)
Then I proceeded to disconnect the 3 white flat ribbon cables being fed to the mainboard.
This test is to determine SMPS and Mainboard functionality. The TV was able to power on and the red LED stayed solid. (This is good)
Wait about 20-25 min before connecting anything or wait till voltage drops below 25v this keeps the boards from being damaged.
Next I reconnected all the plugs except the P2 plug going to the SC board this also includes the ribbon cable from the SC to the Mainboard (this must be plugged in to allow the SOS detection to report a SOS 7 failure).
After connecting everything but the SC board power feed the panel turned on to display a SOS 7 fault, this is what we are looking for this means the SC board has a possible short. One other way to tell is to put your DMM into Diode mode and look for low or zero resistance or a beep. This means the SC board has failed.
After this test is complete again wait a few min to allow voltage to discharge and then reconnect the SC board power feed connector.
Once this is done power up the unit again and you should see a SOS 4 blink.
Also visually inspect your SU/SD IC's for any possible faults/open circuits or blow holes.
These steps apply to most Panasonic Plasma displays. I would also like to thank Tom66 and TW2005 I have learned quite a bit about plasma displays and troubleshooting from you two
Since I cannot find the parts to repair this SC board or a repair kit I am sending it to ModusLink for them to repair it.
Also I do have a question, this is the first plasma panel I have ever seen with out a voltage legend inside the unit. I have no idea what the voltages are supposed to be, I did take them and I believe it was 202/60. I looked everywhere for a sticker but was not able to find one.
I will update when I get my repaired SC board.
Thanks for reading!
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