Hello,
I bought a pre-soldered DSO138 and it worked when I started it for the first time. But soon after the screen went only white and the LED isn't doing anything, which means the MCU isn't working. Also U5 (78L05) gets really hot, which led me to thinking something is off with the 3.3V line. When taking measurements I noticed 3.3V and ground are shorted, so I desoldered some of the connections to 3.3V to see if this fixes anything. I desoldered L4, C16, C17, C18 and JP4 but the short still exists. Is one of the ICs fried? And is there a way to find out fif it is?
Thanks for your help.
P.s.: I know that there are allready some threads about this topic, but everything I found didn't help me.
I bought a pre-soldered DSO138 and it worked when I started it for the first time. But soon after the screen went only white and the LED isn't doing anything, which means the MCU isn't working. Also U5 (78L05) gets really hot, which led me to thinking something is off with the 3.3V line. When taking measurements I noticed 3.3V and ground are shorted, so I desoldered some of the connections to 3.3V to see if this fixes anything. I desoldered L4, C16, C17, C18 and JP4 but the short still exists. Is one of the ICs fried? And is there a way to find out fif it is?
Thanks for your help.
P.s.: I know that there are allready some threads about this topic, but everything I found didn't help me.