Hi,
Refer below:
1. Please provide full device details.
1.1. Device name: IC 1.695M-bit EEPROM CMOS 20-PLCC
1.2. Full part number: AE1818-7675LF
2. What is the failure rate? What is the failure rate vs. tested sample? Example: 2 out of 100 units.
- 7 / 246
3. What is the failure symptom? Please elaborate the failure symptom in detail.
- Test program aborted due to E8251-60666 failed at Store Module Eeprom.
[cid:
image006.jpg@01D4E0C7.8E40C470][cid:
image007.jpg@01D4E0C7.8E40C470]
4. When did the failure happen? How did you discover the failure?
- The failure happen while perform Download Firmware.
- The test program shown E8251-60666 “Eeprom header read from UUT does NOT match header written to UUT.
5. How did you determine the failure? Please elaborate the procedures.
- Refer to the schematic, U101 is the configuration Eeprom.
- We have perform measurement VOLTAGE for U101, good vs bad.
[cid:
image010.jpg@01D4E0C7.8E40C470]
U101 Measurement Voltage (V)
No
U101
GOOD
BAD
1
Pin 1
3.35v
3.30v
2
Pin 2
3.38v
3.30v
3
Pin 3
0
0
4
Pin 4
0
0
5
Pin 5
3.26v
3.30v
6
Pin 6
0
0
7
Pin 7
0
0
8
Pin 8
3.30v
0.035v
9
Pin 9
3.30v
0.035v
10
Pin 10
0
0
11
Pin 11
2.8v
2.79v
12
Pin 12
3.26v
3.30v
13
Pin 13
3.30v
3.30v
14
Pin 14
3.30v
3.30v
15
Pin 15
0
0
16
Pin 16
0
0
17
Pin 17
0
0
18
Pin 18
3.30v
3.30v
19
Pin 19
3.30v
3.30v
20
Pin 20
3.30v
3.30v
6. Does the failure unit ever working before failure?
No
7. Did they violate solder re-flow temperature profiles, moisture sensitivity?
No
8. Did you swap the failure device to a known good board? Is the failure following the device or board?
We have done swapping experiment, the failure is following device.
Thank you.
Regards,
Nabilah
New Contributor
