Question about Sony PFM-50C1 50 in. Plasma HDTV

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Vertical Black line on display

My Sony PFM-50C1 plasma display has a 1-inch wide vertical black line that runs from the top of the screen to the middle, about 8-inches from the right edge of the display. The authorized Sony technician who came to look at it referred me to the manufacturer's repair facility in San Diego. Since the warranty has expired, it will cost me $1100 for round trip shipping to the Sony facility plus whatever the repair costs might be. Do I have any good options besides junking the unit? My PFM-50C1 has two vertical black strips from top to middle at the left top corner. I exchanged the circuit board for this area with the one at the right bottom to see if the problem is with the circuit board. The black strips are still there and display at right bottom is ok. So the circuit board is ok. Where I should look now? Please advise. Thanks.

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  • Master
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Have you checked the cable running from the circuit board to the screen?

Posted on Nov 10, 2008

  • Swilin Sampson
    Swilin Sampson Nov 10, 2008

    No. if the vertical amp has failed, then you would get a horizontal black line and vice-versa.

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Regarding the two vertical lines
It seems that vertical IC is damaged .

You need to replace them .

Posted on Nov 10, 2008

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JoeO700
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SOURCE: Vertical Black line on display

Rakesh, You have a "dual scan" panel, this is why the line only decends down the screen half-way. This could be a connection problem on the buffer board which causes loss of the drive signal only to that part of the display which it is connected to. The vertical address buffer will be located on the top rear of the display, use great caution in inspecting these cables and connectors. If the integrity of the cable and connector is good the panel itself may be bad due to the drive IC being located on the ribbon cable attached to the panel body. this is better known as COF or, chip-on-film technology. I hope this helps you. Good luck. Joe Weibel CustomElectronics.Org

Posted on Apr 24, 2007

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Vertical Black line on display


Rakesh, You have a "dual scan" panel, this is why the line only decends down the screen half-way. This could be a connection problem on the buffer board which causes loss of the drive signal only to that part of the display which it is connected to. The vertical address buffer will be located on the top rear of the display, use great caution in inspecting these cables and connectors. If the integrity of the cable and connector is good the panel itself may be bad due to the drive IC being located on the ribbon cable attached to the panel body. this is better known as COF or, chip-on-film technology. I hope this helps you. Good luck. Joe Weibel CustomElectronics.Org

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