Question about ViewSonic VX2035WM LCD Monitor
The DC voltage on the big cap on the AC primay side which is hooked up the output of the bridge rectifier should have about 160~170DC (120vac x 1.414 = 169vdc) on the cap, this DC voltage is fed to the switching step-down transformer which is driven by the MOSFET.
BE REAL CAREFUL ON THE PRIMARY SIDE! Do not work on it unless you are using good isolation transformer for the 120VAC source or at least use it the 120vac from the GFI outlet!.
What is it not doing?
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Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Posted on Jan 01, 2011
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Posted on Jan 02, 2017
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