I replaced a faulty adjustable 1117 voltage regulator (with a known good regulator) and some defective caps. After replacement, the readings are as follows:
GND Out In
0.51V 3.00V 3.258V
Should be ~ 0V 1.5V 3.3V
Since the output reading is 3.00V instead of 1.5 (and it's getting proper input), does that suggest the SMD cap and/or resistors are fault?
That is, the regulator is not being adjusted properly. We would use V = i * R, right?
The SMD cap CB35 is 0.1uf 16V, R48 is 22 Ohm 1/16 Watt and R46 is 110 Ohm 1/16 Watt. In-circuit, I measure R46 at 25 Ohms, R48 at 20 Ohms.
I will test them out of circuit (R46 especially). I just want to confirm that the SMD caps/resistors are where I need to focus my attention. Thanks in advance for your help!
GND Out In
0.51V 3.00V 3.258V
Should be ~ 0V 1.5V 3.3V
Since the output reading is 3.00V instead of 1.5 (and it's getting proper input), does that suggest the SMD cap and/or resistors are fault?
That is, the regulator is not being adjusted properly. We would use V = i * R, right?
The SMD cap CB35 is 0.1uf 16V, R48 is 22 Ohm 1/16 Watt and R46 is 110 Ohm 1/16 Watt. In-circuit, I measure R46 at 25 Ohms, R48 at 20 Ohms.
I will test them out of circuit (R46 especially). I just want to confirm that the SMD caps/resistors are where I need to focus my attention. Thanks in advance for your help!
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