"your name here" wrote in message
...
Definitely check the zener diode ZDB01 near the vertical chip ICB02
like James says. If its open in the forward direction then the main
power supply is overvoltaging and you must replace the 4n35 (ICA04).
And check RB30 and RB35, both 1 ohm 2 watt resistors in the vertical
section. If the zener was bad its likely ICB02 is bad also.
Z


Did they just get a bad batch of 4n35's or what? I've fixed a pile of
Viewsonics with that same exact problem.