Classic II EGRET question

[fit2page]

I am currently working on a Classic II logic board which has no sound and black screen. Analog board is definitely OK, so I am suspecting the EGRET chip. The VCC is OK, if there is no waveform on pin 3 and 4 of the EGRET (OSC pins), can I conclude that the EGRET chip is dead?

 

[bibilit]

Maybe not, the best option is to remove the Egret from the board, clean the area, put it back and see if something has changed.

The Egret is surrounded by several caps, most of them leaking all other it, so you are probably going to find juice under the chip.

Pin 3 is connected to one of the legs of Y1 (OSC), while pin 4 is connected to the other leg... you are right

pin 5 to 19 of the sound chip (chip) and pin 22 to 21 of the same chip (are those OK ?)