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How to accurately determine if an integrated circuit is damaged?
When measuring the DC working voltage of each pin of the integrated circuit, if the voltage of the individual pin is inconsistent with the voltage value indicated in the schematic or maintenance technical data, do not rush to conclude that the integrated circuit is damaged. The following factors should be excluded first.
What causes the die to fail on an IC?
Impurities and contaminants within the bulk silicon, crystal defects, and design issues during IC fabrication contribute to stability issues in the final chip. Small clearances between the die and the substrate (i.e. die-attach failure) can lower the thermal conductivity of the die.
Can You troubleshoot an IC on a PCB?
ICs are far from easy to troubleshoot, particularly when they’re already mounted on a PCB. At least, using the following techniques, you can fairly easily determine if an IC is defective and needs to be replaced:
Why are ICS fail and how to troubleshoot them?
All in all, the purpose of troubleshooting integrated circuits is often not to repair them (again, fixing ICs is incredibly complex and chips are rather inexpensive to replace); rather, it’s to understand the underlying causes of failures and how they contribute to equipment malfunction.
How can you find a fault in an electrical circuit?
In order for you to be able to walk up to a machine and locate the fault, you must have a good understanding of Electrical Circuitry. You may at times be fortunate and have a schematic electrical drawing and at times there will be nothing. If you do not understand an electrical circuit, you will be at a major disadvantage.
What’s the best way to test a power circuit?
One for the power circuit, and another for the control circuit. Please make sure you follow the correct testing procedure before touching anything. Your voltage tester is the most important item in your toolkit, USE IT! Check for any visible damage to the machine.
Can a continuity tester work on a live board?
PLEASE, Never Work On A Live Board! Connect one lead from you continuity tester on the load side of the control circuit breaker and make sure you are set to the Ohm Scale. What we will do now is take the other lead and follow each wire in the circuit.