My web site has had how to repair these Viewsonic monitors when they have garbage on the screen. You replace C19 with a 1 uf to 4.7 uf at 16 volts capacitor. Now I want to add that if it has a reddish picture with green streaks to the right of the text, you can replace C67. Again use a 1 uf to 4.7 uf at 16 volts capacitor. The capacitors should be available at Radio Shack. I have also encountered one monitor that would not turn on for 5 to 10 minutes. I replaced the capacitor that is just to the right of the C67 labeled IC to fix it. I think it was 22 uf at 16 volts but it might have been 47 uf. I have only encountered that problem once.
Thanks! Worked great. I used surface mount capacitors, just for a challenge :-)
ReplyDeleteDespite the four-plus-year gap, still spot-on info! Thank you! FYI, the repair manual has gotten posted online now (Google for "viewsonic_va800-vlcds21833-1r-.pdf").
ReplyDeleteFrom the manual: C19 and C67 are originally 1uF 50V (I tried replacing C19 with a capacitor that measured 0.95uF and it worked). I believe the last capacitor you mention is C170, originally 22uF 16V in the spec.
Here's some symptom keywords for Google since I had difficulty finding this post: stripes on display, video signal corrupted with noise, static-y lines, even on default no signal error screen, broken display, broken driver bad video signal decoder, processor decoding buggy, signal from board buggy, cable seems bad.