Re: TC-55CX400U Panasonic TV red light but black screen
I think I tried this too. I will try again. So I think I did this:
Removed the cable that goes from powerboard to mainboard. And pressed on the power button to see if the audio plays or there is any change in display. No nothing happened.
observer247
Member
Last Activity: 01-19-2019, 10:08 AM
Joined: 01-16-2019
Location: Fremont, California
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Re: TC-55CX400U Panasonic TV red light but black screen
I checked with a flashlight, did not see anything on screen. Also I did not see any light in the dark.Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
@budwich when you say check " vcom point and vref". What do I check ?
I uploaded a high quality image of the power block. Once the image load, there will be a link saying "Load Full Resolution". Click on that please
[url]https://ibb.co/MNb8SDn[/url]
If this is not clear enough, uploaded same in two parts:
[url]https://ibb.co/qjDY89Z[/url]
[url]https://ibb.co/34FmKMm[/url]Re: TC-55CX400U Panasonic TV red lig...h when you sayLast edited by observer247; 01-18-2019, 10:12 AM.Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
Update: I checked the voltage on both sides of the fuse. Its 11.65V on both sides. Also I disconnected later the cable from power board to main board, I could not see any backlight.
I checked the fuse. It shows 000 which means its good. Which points do I check the powers at (for 12V) incoming and outgoing ? Should I check the pins near the LVDS connectors. Thanks.Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
Found the fuse. Attached photo with arrow.
The photo is of my t-con board. Where do I check for 12V and what should be the voltage on the way out of the ribbons....Last edited by observer247; 01-17-2019, 10:01 PM.Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
This is the image of a t-con board. Can you please point where the fuse is ? [url]https://www.wavesparts.com/wp-content/uploads/2017/12/6146_6e04e1a9-ee10-4d2a-9248-63a22a50c7f50.jpg[/url]Re: TC-55CX400U Panasonic TV red lig...7f50.jpg[/url]Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
I will check for the fuse on the tcon board. Do I additionally check under the black cover. Or do I have to remove the aluminium bar. I am assuming the fuse is on the top and not under the board. So next is I will look for the fuse.
Another thing I noticed now (with room dark) is that when I press the power button for 10 seconds, before the sound comes on, there is a light flicker on the left side of the screen for a fraction of a second. I could not see any panasonic logo etc on the screen though, just a light...Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
One important update is that the sound works (connected laptop to hdmi) and trying various inputs took to the right input. To power on for some reason, have to press power for 10 seconds. The remote works when I mute the TV, volume up-down or change inputs.
Also a new update is I see a red light on the boards (attached photo)
As far as the next steps suggested, I tried the following:
Removed the ribbons on the tcon board one by one (the ribbons marked in the photo). I did not see...Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
So this is what I understood. On the TCON board (the bottom board, marked in my attachment), I need to check for the fuse. Also somewhere it should show 12V.
When you said disconnect one at a time the ribbon cable, I see three ribbons. Should I disconnect one by one (keeping at most one ribbon disconnected at one time) ? Which part is called the panel ? I will check the display but what to check on the main card ? Thanks....Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
I took all the readings. The table is attached. Some of the pins (towards the middle) are little hard to reach.
I tried to take out the tab (B) in the previous image. I know its a silly question but how to pull it out. Should I press the tab in any specific direction and pull. Then I can get more accurate readings from the Control Board side.
And please let me know if I need to do any more readings. I cross checked the results around 4 or 5 times. I also uploaded a clearer picture of the voltages...Last edited by observer247; 01-16-2019, 07:39 PM.Leave a comment:
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Re: TC-55CX400U Panasonic TV red light but black screen
Thank you for responding. I am new to using multimeter. One question. Please check the attachment (to this comment). I am supposed to measure the voltage at A (marked with yellow), right ? But around the area where I marked with A, its little difficult as there is not much space (still can do). But what if I measure at the Main Board side after pulling out the tab, ie the area marked with B.
So this is what I will do, overall:
A) Have the TV plugged out
B) Plug in the TV. Do a round of measurement....Leave a comment:
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TC-55CX400U Panasonic TV red light but black screen
My TC-55CX400U has its red led light turn on and responds to the remote but the screen stays black. I tried resetting etc but the red light does not blink at all and stays solid. I opened the TV and checked the power output from the power board. I have attached a photo with the boards.
I have checked the voltage on the pins of the wire (red arrows) that connects the power board (yellow) to the main board (blue). The multimeter measurements matches with the ones marked on the power board (marked with red circe in the attachment).
So does this mean that the control... -
Re: New Members - please post your introductions here
I have been looking for information for my tv for a week now. And today found a very informative post here in this forum. This forum looks amazing ! Happy to join !Leave a comment:
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