OWON SDS9302 CH1 & CH2 signal issues

[No.Mad]

Hi everybody,

recently I got my hands on OWON SDS9302V  oscilloscope and after first power up i have behaviour as in attached photos. Happens all the time after minute or two (once it didn't for 10 min, I could do self calibration). Did anybody come across this problem?

For interested what I managed to retrieve as once scope what functioning properly:

Model: SDS9302V
Ver.: 1.5.1
Checksum: C053DED0

Square wave 5V, 1kHz, selfcalibration successful (once)

I would appreciate any pointers where fault may live.

Cheers!

[shakalnokturn]

I'd check power is clean, just because that's where you're meant to start troubleshooting.
Next I'd be looking for a BGA FPGA to push down on see if it gets you longer normal time.