Re: Acer x193w with Darfon B092-XXX inverter - assistance needed! [lotsa pics!]
After looking at previous posts, the inverter IC is BIT3715, and the FET driver is P2804ND5G. The text on the parts was somewhat unreadable on my board, but based on previous posts, I'm pretty sure they are the same.
Next step is to test the transformer windings, but I'll have to get back to it in a few days.
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Re: Acer x193w with Darfon B092-XXX inverter - assistance needed! [lotsa pics!]
My board is identical to the photos in the first post <https://www.badcaps.net/forum/showpost.php?p=120538&postcount=1>.Last edited by timg11; 12-29-2013, 07:41 PM.
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Re: Acer x193w with Darfon B092-XXX inverter - assistance needed! [lotsa pics!]
I did some investigating with the oscilloscope, and found that the power supply to the inverter (around 24-28 VDC) looked really bad when the inverter tried to start up:
(Note - probe type is not recognized by scope - multiply voltages by 10)
There shouldn't be that type of waveform on a power supply, so after considering the name of this forum, I inspected the capacitors (these were 220uF 35V - effectively in parallel because the inductor shown on the silkscreen was replaced with...Last edited by timg11; 12-29-2013, 05:01 PM.
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Re: Acer x193w with Darfon B092-XXX inverter - assistance needed! [lotsa pics!]
I have this exact same monitor with the same inverter that just went bad.
It started making a whining noise one day and the screen got very dim, then went out completely. When powering up now, I get the squeal from the inverter for a few seconds, then it shuts down.
It's been a good monitor and I hate to trash it, so I'm having a look to see if there is any practical fix. I've taken it apart and have the inverter board accessible. The oscilloscope shows approx 24V DC...
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