I'm trying to repair my Siglent SDG1025 function generator which has damaged CH1. CH2 works properly.
I replaced two components (U19 and Q3=BAV99) but channel one shows a weird waveform.
U19 = THS3095 is a special OpAmp that can be turned ON-OFF via its PIN-8. so it's likely that it's OFF.
I spent a lot of time, but I could not find a trace connecting to PIN-8 of U19. I can see a tiny track and a VIA on the PCB connected to PIN-8, but it goes from mid-layers to somewhere unknown.
if somebody has this device please check the voltage on PIN-8 of U19, when channel-1 is active and Vpp is above 2 volts.