[41] Odd display problem

[emece67]

A pity nobody can give a clue.

In any case, I keep looking for it. I've found that, in a a working 41, the display OS1 signal stays at 0.9 V in RUN and SLEEP modes, whereas it shows a triangular waveform, between 0 and 0.9 V (at a frequency of 7 kHz) in STANDBY mode. The 7 kHz frequency is consistent with the 11 minutes timeout, as the LCD driver chips wait for the timeout 9·2^19 ~ 4M7 cycles. At 7 kHz such number of cycles means ~11 minutes.

My faulty 41 does not show such triangular waveform, it remains fixed at 0.9 V anytime. I do not know yet if the oscillator is faulty or there is another reason for this behavior (although I am missing the hope on such).

Regards.