Today I got a call from a guy with this TV claiming the main board was bad. I paid $40.00 for it.
Got it back to the house, took the back off and found the ribbon cable unhooked from the t-con at the main board. I hooked it back up and started checking voltages. The power supply was fully functional but I found no power from the main to the t-con. I tried heating the main board with no change in status.
The backlights would flash and I could see there was something on the screen. With repeated on-off and looking at the screen I was beginning to believe the display was bad. I saw horizontal lines on the screen and parts of the display appeared not to be working.
I was getting ready to re-install the back cover when I thought to try disconnecting the ribbon cables from the t-con to the buffers. I unplugged the left connector and the right side of the screen came up with the "Sharp" logo and looked good.
So I plugged it back in, re-connected the left cable, unplugged the right one and the left side of the screen came up and looked good.
The truth, I was a bit stumped. I couldn't believe each side only worked with the opposite side unhooked.....and then it hit me....has to be a bad connection, right? So I plugged the right cable back in, hit the power button, the TV came on, stayed on and now IT WORKS!!!!!!!!!!
Either the guy forgot to hook the LVDS back up....or thought the panel was bad and left it unhooked so no one could see the screen flash and the appearance of a bad panel.
I must now go clean the hash marks outta my shorts! I don't believe it, I just don't believe it!!! This is WAY WAY COOL!!!!!!!!!! After I get a change of underwear I'm going to unhook the t-con to buffer cables and clean all the connections just to be thorough.
Got it back to the house, took the back off and found the ribbon cable unhooked from the t-con at the main board. I hooked it back up and started checking voltages. The power supply was fully functional but I found no power from the main to the t-con. I tried heating the main board with no change in status.
The backlights would flash and I could see there was something on the screen. With repeated on-off and looking at the screen I was beginning to believe the display was bad. I saw horizontal lines on the screen and parts of the display appeared not to be working.
I was getting ready to re-install the back cover when I thought to try disconnecting the ribbon cables from the t-con to the buffers. I unplugged the left connector and the right side of the screen came up with the "Sharp" logo and looked good.
So I plugged it back in, re-connected the left cable, unplugged the right one and the left side of the screen came up and looked good.
The truth, I was a bit stumped. I couldn't believe each side only worked with the opposite side unhooked.....and then it hit me....has to be a bad connection, right? So I plugged the right cable back in, hit the power button, the TV came on, stayed on and now IT WORKS!!!!!!!!!!
Either the guy forgot to hook the LVDS back up....or thought the panel was bad and left it unhooked so no one could see the screen flash and the appearance of a bad panel.
I must now go clean the hash marks outta my shorts! I don't believe it, I just don't believe it!!! This is WAY WAY COOL!!!!!!!!!! After I get a change of underwear I'm going to unhook the t-con to buffer cables and clean all the connections just to be thorough.
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