How to repair display?

Hi @barbara2686

Did the repairer happen to mention fixing any liquid damage to the motherboard?

Check if the LDI (liquid damage indicator) in the tablet has changed colour, indicating that liquid has penetrated the case and may have caused some damage to the systemboard.

I realize that the link is showing the LDI in a phone but it is the same for a tablet, at least with Samsung it is.

If the LDI has changed colour it means that water has entered the case.

The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the tablet's operating design and could damage the components. The corrosion starts immediately and is ongoing until it is completely cleaned away

Do not try to charge or to turn on your tablet anymore and then remove the battery as soon as possible from the tablet to minimize any further damage.

Then you need to dis-assemble the rest of the tablet and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion and water. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives which may leave conductive residues and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better

Here is a link that describes what happens. Electronics Water Damage

As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board. Remove the shields that may be covering some components as the water may have got in under there. The ends of any flex cables and their connectors need to be cleaned as well

Hopefully after you have done all this the tablet might possibly work correctly again.

Here is a teardown video that may help.

If this process seems too daunting, take your tablet back to the repairer who replaced the screen and ask them why nothing was done about the LDI changing colour. If they don't want to know take the tablet to a reputable, professional phone repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.