I am trying to fix this Panasonic 50 inch LED 4k smart TV. It has a blank screen with a blue hue but has perfect sound. I can change channels with the remote but there isnt even a 'no signal' on screen just a blank screen with normal sound. The screen panel is showing no signs of cracks or damage.
I have some decent knowledge of electronics and know how to use a multimeter but am by no means an expert.
I bought a donor TV very cheaply from Ebay which is exactly the same model. I have been attempting to troubleshoot using parts from the donor TV. To cut a long story short I have narrowed it down to a problem with the right hand LED driver board strip which is situated horizontally along the bottom of the screen panel. The reason that I think it is the driver board is that I have had 2 different tcons in the TV with no difference to the outcome. I have replaced power board, main board , lvds cable , tcon ribbons all taken from the donor TV. I have changed the power board to main board cable. I have also tried cleaning the pins on the tcon to panel connectors. No change
Today I compared some voltage tests on the smd capacitors on the right hand driver board on both the donor TV and the one I am trying to fix. There was a very different result. The donor TV is testing at 17.5 volts on the output side of the capacitor . The faulty model is showing virtually no voltage or 0.3 at the very most on the same side of the cap. The same result is achieved on all the larger sized smd capacitors on the right side driver board strip. AM I on the right tracks here? And if so, would removing the capacitors for testing be the way forward?
I have some decent knowledge of electronics and know how to use a multimeter but am by no means an expert.
I bought a donor TV very cheaply from Ebay which is exactly the same model. I have been attempting to troubleshoot using parts from the donor TV. To cut a long story short I have narrowed it down to a problem with the right hand LED driver board strip which is situated horizontally along the bottom of the screen panel. The reason that I think it is the driver board is that I have had 2 different tcons in the TV with no difference to the outcome. I have replaced power board, main board , lvds cable , tcon ribbons all taken from the donor TV. I have changed the power board to main board cable. I have also tried cleaning the pins on the tcon to panel connectors. No change
Today I compared some voltage tests on the smd capacitors on the right hand driver board on both the donor TV and the one I am trying to fix. There was a very different result. The donor TV is testing at 17.5 volts on the output side of the capacitor . The faulty model is showing virtually no voltage or 0.3 at the very most on the same side of the cap. The same result is achieved on all the larger sized smd capacitors on the right side driver board strip. AM I on the right tracks here? And if so, would removing the capacitors for testing be the way forward?
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