Hi there.
i have asked in forum from my country about checking on the board. They said me "the device is multimeter"
I have read before minutes that :
1. More than 0.7V difference between base and emitter voltages indicates an open circuit b-e junction.
2. The same voltage on two or more terminals MAY indicate one or more short circuit junctions.
3. A LOWER than expected collector voltage generally means that the transistor is conducting heavily (turned on).
4. A HIGHER than expected collector voltage generally means that the transistor is not conducting (turned off).
Note: Whilst conditions 2,3 and 4 can indicate a faulty transistor, they can also be caused by other circuit conditions. For this reason further voltage tests on other transistors (mainly transistors or supply lines feeding the suspect transistor) should be carried out, before deciding the location of the fault.
I want for begining to check transistors on one random my motherboard.
The above things are written for bipolar transistors. I should make an analog with FETs(terminals), i guess ?
Which is the motherboard ground - where is it ? I should make these measures "to" Zero.
About the collector voltage - It`s written "than expected." I doubt that if we have 30 transistors we check in WWW this volgate. What is accepted as principal?
Thanks in advance!
i have asked in forum from my country about checking on the board. They said me "the device is multimeter"
I have read before minutes that :
1. More than 0.7V difference between base and emitter voltages indicates an open circuit b-e junction.
2. The same voltage on two or more terminals MAY indicate one or more short circuit junctions.
3. A LOWER than expected collector voltage generally means that the transistor is conducting heavily (turned on).
4. A HIGHER than expected collector voltage generally means that the transistor is not conducting (turned off).
Note: Whilst conditions 2,3 and 4 can indicate a faulty transistor, they can also be caused by other circuit conditions. For this reason further voltage tests on other transistors (mainly transistors or supply lines feeding the suspect transistor) should be carried out, before deciding the location of the fault.
I want for begining to check transistors on one random my motherboard.
The above things are written for bipolar transistors. I should make an analog with FETs(terminals), i guess ?
Which is the motherboard ground - where is it ? I should make these measures "to" Zero.
About the collector voltage - It`s written "than expected." I doubt that if we have 30 transistors we check in WWW this volgate. What is accepted as principal?
Thanks in advance!