Question about Envision EN-7100e 17" Flat Panel LCD Monitor
My relatively new Envision 17" LCD display will not stay on. It turns on and then, without displaying, turns off in about 5 seconds and repeats this process over and over. The CCFL backlight flickers just as the display is power cycling. I have isolated the problem to the power supply, which is internal to the monitor. By pulling the CCFL backlight power plugs I can get the monitor to turn on and off and stay on as expected (of course I can't see anything). THere are 2 CCFL tubes in the monitor and the power cycling happens with either one connected to the power supply. Since it's unlikely both tubes went bad at once, I suspect the power supply rather than the CCFL tubes. THe manufacturer wants more for the board than I paid for the monitor so it's either fix the power supply or dump the display. I've looked at a number of power supply boards on ebay and they all seem to have the same configuration with an inverter section for each CCFL - again, since my problem happens when either CCFL is connected, I am suspicious that the problem lies in the part of the power supply that controls the CCFL inverters. Anyone understand these things to the point they can offer some assistance?
Seems the N-Channel MOSFET switch in the power supply is the culprit. NTE does not list a replacement part for this, so a sub is necessary (any N-Channel 600V MOSFET in same TO220F case should suffice). I have to look one up for mine.
Posted on Mar 25, 2009
If this were my monitor, I would keep an eye on eBay for the same or similar model, except with a cracked screen or some drastic physical damage that would allow you to get the monitor really cheap, then cannibalize the power supply (provided the new one powers up okay). Definitely cheaper than ordering parts from a manufacturer.
Posted on Jun 21, 2006
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