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Portable tablet computer released in July 2017. Has an 8" display , 2GB memory, and 16GB storage. Identified by model number TB-8504F.

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Touch screen not working after replacing LCD ribbon

Screen on tablet was previously blank and unresponsive so I replaced the ribbon cable for the screen. Now the screen comes on but the touch is not working on the screen now. Any suggestions for fixing?

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Hi dear, may I know the pinout of lcd connector please..?


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Hi @alex_aus ,

You may have to replace the screen/digitizer assembly to determine whether the problem is with the digitizer in the original screen assembly (which it may have been along with the cable as you couldn’t tell with a blank screen) or whether there is a problem on the systemboard or even that the replacement cable is faulty or the wrong one.

You did disconnect the battery before working on the cable etc, didn’t you?

Here’s a link to just one supplier It is shown to give you an idea of the cost of the part. There are other suppliers that may suit you better. Just search for Lenovo Tab 4 T-8504F digitizer to get results.

It may be possible to find a supplier that has a good returns policy, i.e. refund minus a small restocking fee perhaps, so that you can return the assembly in the event that it is not the problem, minimizing the cost to you

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Alex sera éternellement reconnaissant.
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