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Touch Design - Troubleshooting
1. No Touch response when display touched
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Swap display panels with known good panel. If touch works, problem with display flex or IC (Go to
2). If still not working, problem with main board (Go to 3).
2. Display panel issue
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Check Touch flex for any damage.
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Ensure TOUCH_VCI 3.2VDC and TOUCH_VIO 1.8VDC power is at bypass caps C1, C5.
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Verify Reset signal is high on Touch ZIF pin 2, ATTN is high on ZIF pin 2.
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I2C Data and I2C Clock at 1.8VDC.
3. Main Board Issue
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Check connector for full insertion.
•
Ensure TOUCH_VCI 3.2VDC and TOUCH_VIO 1.8 VDC supplies are on the main board display ZIF
connector(J5300)Verify Reset signal is high, INT is high, I2C Data and Clock at 1.8VDC.
•
When touching panel, INT should toggle low, I2C data and clk will toggle.
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Table of Contents
Troubleshooting
