Question about ViewSonic VX2035WM LCD Monitor

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Does anyone know what the initial DC voltage is on this, as in, where does the 120DC coming out of the rectifier go(into)?

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  • a_haun_kj4ip Jan 01, 2011

    What I am attempting to do is to mod this display into a device, but I cant find that voltage, and my HV meter died, I am working on making a power supply that will supply the display, a 18.5v mac mini, and some 5v devices.

    -KJ4IPS

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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!.
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VX2035/

What is it not doing?
PM me if you me to send you the service manual: budmrtn@aol.com


Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
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

  • a_haun_kj4ip Jan 01, 2011

    @budmrtn
    I am atteptting to mod this into a system where I am given a DC input at 20V, and i have regulators and other components that allow me to get a target voltage, as of now, the laptop-battery powered system can power a 18.5v Mac mini, some USB stuff @ 5v, andI have about 3A left in the batt. managment system (20V) (90W) and I need to know what voltage I can feed into the PSU, besides inverting and stepping up to 120V AC, or 120DC for after the rectifier

    Thanks in advance
    -KJ4IPS

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