Here is pin 2 (ch1) and pin 11 (ch2) of IC301, from power up:
and zoomed in to the trace once both signals are running:
Sorry for the photos, but for some bizarre reason, the utility I have always used to grab screen shots from the Rigol suddenly bombs out trying to connect to the scope. The noise and over/undershoot on the traces is purely from my crap, but safe, probing setup.
Switched the meter on this morning and without any scope connections, checked 4 digits - Overload message - switching back to 6 digits OK.
Shows overload on all ranges when in 4 digits.
I think you mean IC310
Checked the lines ABCD LD ENP ENT that are tied to 5v, all OK
Pin 11 and 12 low - no sign of life
Pin 13 and 14 nice 340ns pulses
I see the wide pulse on start up followed pulse train as per your screen shot, but nothing on Pin11
On one start up while the clips were connected to IC310, the meter turned on with no Glug Death and a proper self test and initialise. - I also seen the expected pulse train on pin 11.
Checked 4 digits again and same "OVERLOAD" message.
Rechecked pin 2 and pin 11 of IC310 and pin 11 still dead. ( tried triggering on pin 11, nothing apart from a slight ring on the falling edge of pin 2 squarewave)
This area of the board shows some signs of corrosion due to the proximity to the battery - I might resolder the pads of this IC and see if that makes a difference.
<edit> After posting this, checked 4 digits again and switches OK without OVERLOAD ERROR , still with Glug Death- pin 2 shows change from 1.5khz to 24khz
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