by vivat » Fri May 06, 2011 6:08 pm
Please verify that your touch screen is properly connected to the J8 connector on the TC553/852 controller. Carefully pull the latch on connector J8 out. Insert the flex cable into J8 being sure it's seated, push the latch back in.
Also, please make sure that the flex cable is not bent or damaged in any place. The damage can be caused by sharp objects, excessive bending of the flex cable or excessive insertion of the flex cable's conductor into its receptacle during assembly. Some failure modes are not obvious to the naked eye.
If you have an ohmmeter, pull the flex cable out of the J8 connector and measure resistance between PIN's 1 & 3 and 2 & 4, it should show resistance. Measuring resistance between PIN's 1 & 2, 1 & 4, 3 & 2 or 3 & 4 shouldn't show any resistance (open).
Please verify that your touch screen is properly connected to the J8 connector on the TC553/852 controller. Carefully pull the latch on connector J8 out. Insert the flex cable into J8 being sure it's seated, push the latch back in.
Also, please make sure that the flex cable is not bent or damaged in any place. The damage can be caused by sharp objects, excessive bending of the flex cable or excessive insertion of the flex cable's conductor into its receptacle during assembly. Some failure modes are not obvious to the naked eye.
If you have an ohmmeter, pull the flex cable out of the J8 connector and measure resistance between PIN's 1 & 3 and 2 & 4, it should show resistance. Measuring resistance between PIN's 1 & 2, 1 & 4, 3 & 2 or 3 & 4 shouldn't show any resistance (open).