Back Glass or Whole Housing replacements can suffer from the same issues, mainly damaged flexes or connectors. If the phone works fine without the cameras, then closely examine the camera flexes and connectors (and the equivalent connectors on the logic board.
Look for tears in the flexes, even the tiniest ones. Sometimes the connector pins get damaged or some surrounding components can be fully or partially dislodged. All of this inspection may require some magnification.
EDIT 2020-10-26
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Take a closer at this flex, based on your pictures below.
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Take a closer at this flex, based on your picture below (https://ibb.co/g9qRMTj).
Back Glass or Whole Housing replacements can suffer from the same issues, mainly damaged flexes or connectors. If the phone works fine without the cameras, then closely examine the camera flexes and connectors (and the equivalent connectors on the logic board.
Look for tears in the flexes, even the tiniest ones. Sometimes the connector pins get damaged or some surrounding components can be fully or partially dislodged. All of this inspection may require some magnification.
+
+
EDIT 2020-10-26
+
+
Take a closer at this flex, based on your pictures below.
Back Glass or Whole Housing replacements can suffer from the same issues, mainly damaged flexes or connectors. If the phone works fine without the cameras, then closely examine the camera flexes and connectors (and the equivalent connectors on the logic board.
Look for tears in the flexes, even the tiniest ones. Sometimes the connector pins get damaged or some surrounding components can be fully or partially dislodged. All of this inspection may require some magnification.