I found PCB from classic 2600 JR. It was forcefully removed from case maybe using hammer. The PCB is bent, some parts torn out and missing switches.
PCB was cracked and several traces were broken. I repaired them, but game didn’t start. Sometimes I noticed some video starting, but only for few frames. I checked all connections using oscilloscope and found that CPU address pin (A7, maybe) is floating. I removed the chip and everything become clear:
Very interesting- chip body is broken, but crystal is OK. Only ONE leg disconnected.
The rest of the story is very simple: ordered some cheap from china, received fake one, opened dispute, received money back. Then ordered some other and system started up.