How do you know the capacity of the chip capacitors on the circuit board?

kal9623287

How do you know the capacity of the chip capacitors on the circuit board? [Copy link]

The chip resistors on the circuit board are marked with resistance values, but the chip ceramic capacitors do not have any markings.

The capacitor installed on the circuit board is suspected to be damaged. What is the capacitance value? Is there a schematic diagram? Please tell me how to solve this problem.

chunyang

It can be analyzed based on the circuit. If there is an identical circuit on the PCB, the capacitors at the same position can be removed and measured.

qwqwqw2088

Before it breaks down, you can measure it with LCR and multimeter.

After the damage, we can only infer it by the circuit location

se7ens

A slight change in capacitance is acceptable

But if it is open or short circuited, it is basically broken.

Without a schematic diagram, you can only guess. By looking at where the same package is installed, you should be able to judge the voltage.

kal9623287

chunyang posted on 2022-5-6 11:35 You can analyze it based on the circuit. If there is an identical circuit on the PCB, you can remove the capacitors at the same position and measure them.

How to determine if there is no schematic diagram when repairing other circuits

kal9623287

se7ens published on 2022-5-7 13:55 A slight change in capacitance is acceptable, but if it is open or short-circuited, it is basically broken. Without a schematic diagram, you can only guess. Look at the same...

If you are repairing other circuits, how can you accurately determine the circuit without a schematic diagram?

kal9623287

qwqwqw2088 posted on 2022-5-6 15:35 Before it breaks, you can measure it, LCR, multimeter, etc. After it breaks, you can only infer it by the circuit position

How to infer

chunyang

kal9623287 posted on 2022-5-7 15:46 How to determine the situation of repairing other circuits without a schematic diagram

Circuit analysis, can't you measure and map it yourself without a schematic diagram?

kal9623287

chunyang posted on 2022-5-8 20:08 Circuit analysis, can't you measure and map it yourself without a schematic diagram?

Thanks, now I know