Hi

I have a fried zener diode i'm trying to identify with no luck.
It is D804 on the pcb.

The only markings i can see on the diode are "z 18c".

Any help would be greatly appreciated!

Hi this is 18V Zener.

Do you have FCC number for this unit.

Rich

Thanx!

At first i doubted its 18v since its connected to a 200kohm resistor which
has around 100v on it.
But will give it a try anyway.

FCC ID: h4icm17004

Hi is this in the power supply.

The unit is a Lite-On so schematics will be hard to find.

Rich

Yes, its the power supply.

Hi if this unit uses the 3842 as a psu chip then I guess this zener is on pin 7 and it may have blown due to a regulation failure as the psu will provide its own supply to this IC once it powers up, the 100k I guess is a start up supply.

Rich

hi

replaced the 18v zener and a 200kohm resistor that changed its value to 130kohm.
monitor seems to work fine now. will know for sure after i let it run
for awhile.

Thanks for your help!

Schematic from HP D2817A/Viewsonic 1769GA