Editing PowerBook Duo 250 (section)

== Display ==
The 250 has an active-matrix greyscale panel with a separate inverter board and brightness actuator inside the display housing.<ref name="ss" /> Two of Apple's cautions apply only to the 250 and 280:
* The inside of the 250/280 display housing has a copper surface that flakes or peels when touched, and the flakes can short the system (PDF p. 151).<ref name="ss" />
* Protective tape covers the inverter board; peeling it off can short the board (PDF p. 161).<ref name="ss" />

Apple's rule for dead pixels on the 250 and 280: replace the display if more than five pixels stay white, or if two or more such voids are within an inch of each other (PDF p. 50).<ref name="ss" /> Apple supplied 250 display assemblies, housings and cables to CPRC and international repairers only.<ref name="ss" /> MacDat found no electrolytic capacitors on the 250's LCD and had not checked its inverter board.<ref name="macdat250">MacDat, [https://macdat.net/cap_reference/apple/powerbook/duo250.html "PowerBook Duo 250 Capacitor Reference"] (retrieved 2026-10-02). Same logic board list as the 210/230: one 330 µF 16 V, three 100 µF 35 V, two 100 µF 25 V (100 µF 10 V on earlier boards), one 33 µF 25 V; the 250's LCD uses no electrolytic capacitors; inverter not checked; early trackballs have one 10 µF 6.3 V. Secondary source.</ref>