May user are interested in how we approach problem(Issue information of LED product) .
Let’s talk a bit about the processing procedures.
PROBLEM DESCRIPTION:
The customer have found some problems that high IR of LED , low voltage, Dead lights .
SampleVerification
*Analyze the defective products.: test device HP821 LED , test current IF 20MA
| NO | VF@20MA | uA@7V | Result |
| 1 | 3.07V | OL | NG |
| 2 | 3.28V | OL | NG |
| 3 | 0.94V | OL | NG |
| 4 | 3.12V | 55.76 | NG |
| 5 | 3.02V | 80.02 | NG |
| 6 | 3.1V | OL | NG |
| 7 | 3.09V | OL | NG |
*The Primary Probe for Using Microscope into the LED internal
Wire bonding is ok
*SEM Check out:
Summary:
Actor/Contributor: The report identifies that electrostatic breakdown destroys the led