Re: Panasonic TC-55CX400U - stuck on logo
TV fixed!
Since Seiki is the OEM manuf. for this Panasonic TV, I went with the 55" Seiki mainboard with the same board/version number after consulting with my firmware friend(doesn't do TVs but just to get an idea how these things work). Turns out the Seiki board had one less USB port, which I missed in the pics, but it still had the usb 2.0 port, so all was good.
It powered up with the Seiki logo, and all seemed to work fine. I didn't have a remote...nor a universal one, so I said what the heck..and I...
g20zoom
Member
Last Activity: 10-13-2017, 11:09 PM
Joined: 09-24-2017
Location: Los Angeles, CA
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Re: Seiki / Panasonic TC-55CX400U main board substitution and firmware swap?
TV fixed!
Since Seiki is the OEM manuf. for this Panasonic TV, I went with the 55" Seiki mainboard with the same board/version number. Turns out it actually had one less USB port, which I missed in the pics, but it still had the usb 2.0 port, so all was good.
It powered up with the Seiki logo, and all seemed to work fine. I didn't have a remote...nor a universal one, so I said what the heck..and I used the Panasonic firmware for my TV. The firmware upgraded, it rebooted...Leave a comment:
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Re: Seiki / Panasonic TC-55CX400U main board substitution and firmware swap?
Thanks for the link and info in the other post about how to copy the EEPROM. Interesting stuff. That's the board with the right version, just different model. Unfortunately I'm not skilled enough to solder that stuff.
I think my current board has a bad EEPROM though. I've read that the NAND flash goes bad on the lower end models. It seems to have the symptoms of it, powers on, see the logo, then shuts off after a few minutes. remote doesn't work, only physical button on the tv does. Also...Leave a comment:
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Seiki / Panasonic TC-55CX400U main board substitution and firmware swap?
I believe I've narrowed down my dead TV to the mainboard.
I have Panasonic TC-55CX400U led tv which I believe is made by Seiki, and probably equivalent to the Seiki SE55UGT as these have the same mainboards.
How would I go about copying the EEPROM? That way I can use the Seiki board which is cheaper but still come up with the Panasonic logo and use the remote. Someone mentioned there is code on the EEPROM, that a USB firmware upgrade would not overwrite.
Another option I wanted to explore, was to use a Panasonic 50" board with my 55" TV. Since they... -
Re: LG mainboard substitution!
@tw2005,
How do you copy that eeprom data?
If using a board from a different sized TV, but of the same series, could you just reload the firmware from the proper sized TV via USB if that TV brand supported it? That way the firmware from the correct size TV overwrites that of the different model.Leave a comment:
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Re: Panasonic TC-55CX400U - stuck on logo
Thanks for that info. Very good to know I can't just swap brands with a new bin eeprom file and a usb reboot.
What do you think about using a Panasonic board for a different size tv, same model series, same main board, but reflashing using the bin file for my exact size/model ?
Anybody know about replacing the NAND flash/eeprom?
Do you have to remove, copy contents to new chip, then resolder new one in?
And if the nand has failed to write presumably, can you still copy it?
I'm...Leave a comment:
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Re: Panasonic TC-55CX400U - stuck on logo
Thanks guys for all the tips. It's amazing what you can learn from here.
That's true...we had many great Panasonic things in the 80s and 90s from them. Shame they are cutting costs like everyone else.
I would prefer to Keep the Panasonic logo(makes the wife happy) and use the correct remote I already have.
Looks like I have a few options:
1. wait for the exact Panasonic board for the 55" to show up on ebay
2. Use the same board model # and version, from ebay but it's for the smaller Panasonic...Leave a comment:
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Re: Panasonic TC-55CX400U - stuck on logo
tom66 or anyone else that knows...
My main board is stamped "CV6488H-A".
There is also C/N: 890-M00-06NBZ
Since this is rebadged...this board can be bought as a Westinghouse, Elements, or Panasonic. Do you know if it's ok to use any brand? Or will the specific firmware mess things up?
Also, someone on ebay does have the same board but it's for the Panasonic 50 inch version. ie TC-50CX400U
Can I use this board and maybe just reload the firmware?
ThanksLeave a comment:
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Re: Panasonic TC-55CX400U - stuck on logo
ducky29,
Thanks for the firmware.
I powered it up per the instructions with the bin on the USB stick, and it upgraded the firmware, powered off.
Then it powered up, upgraded firmware again, powered off.
Repeated again for a 3rd time.
At this point, I just put the tv face down as I have the back cover off.
What do you think is going on? Sounds like it's not upgrading but then not sticking to the board.
I would think if the firmware was really updated, the firmware would be smart...Leave a comment:
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Re: Panasonic TC-55CX400U - stuck on logo
My dad went cheapie with this brand. It's over 1 year so no more warranty. He even paid for a service call a year ago, but never told me about it so I have no idea what they diagnosed. Frustrating but he's pretty old now. He bought it from Fry's but lost the receipt, and being such a pain to get it again, then use the credit card maybe for the 2nd year of warranty, I figure I'll just troubleshoot myself!
More details:
Upon power up, the "Panasonic" logo is displayed, then the unit powers off within 2-3 minutes....Leave a comment:
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Panasonic LED TC-55CX400U Powers on with logo then shutdown
sorry, duplicate post! -
Panasonic TC-55CX400U - stuck on logo
Sad to say...after 1 year, this TV is no stuck on the "PANASONIC" logo screen upon power up.
Is there any hope for saving this? Is there some kind of hard reset I can do or does it need some kind of new board?
Thanks -
Re: New Members - please post your introductions here
hi!
I love to tinker by fixing anything...whether it be electronics, toys, cars, mechanical stuff. It's a great learning experience and brings reward.
I picked up broken 1 year old tv from my dad, so let's see what we can figure out.Leave a comment:
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