Asus VP247QH monitor - mainboard replacement questions - Page 1
Forum section: electronics / repair

author: Hogwild
author_rank: Regular Contributor
timestamp: January 21, 2025, 06:46:53 pm
content: Hi all:Please assume I have no understanding of electronics other than some ability to solder and a little ability with a multimeter. My background is in IT.I'm trying to repair an Asus VP247QG monitor (23.6" screen).- The DisplayPort port doesn't work at al- The HDMI works fine a lot of the time, but intermittently triggers "no signal" on the screen.- Cable is known good.- Signal sources are known good.I opened up the monitor and didn't see anything visually obvious.- Both ports seem to be firmly soldered in place.- I didn't see any bad solder joints, or burn marks.From what I understand, these symptoms are often caused by a bad chip. That chip would appear to be an RTD2525AR. I found someone selling mainboard units with the same part number as this monitor, but advertising them as a replacement for install in a different monitor.1. Should I assume that because the part no. is the same, it will work okay in this monitor, even though there's a different screen size?2. Do I need to be concerned about the firmware version or anything else for compatibility?Thanks

author: Hogwild
author_rank: Regular Contributor
timestamp: January 25, 2025, 01:55:53 am
content: Okay, I connected everything, and so far, electronically, it does appear to work.However, now I have another problem. The metal assembly that holds the PCBs is "floating" a bit and not fastened down securely. Though it's captured by the shape of the rear cover, it still moves around. Surely these metal PCB assemblies aren't just held down with that silver tape are they? Is there some way to keep the metal assembly fixed and prevent it from moving?

author: benj38
author_rank: Frequent Contributor
timestamp: January 27, 2025, 10:03:49 pm
content: Unfortunately, in many monitorsthey are held down only by that silver tape!

author: Hogwild
author_rank: Regular Contributor
timestamp: February 25, 2025, 04:14:43 pm
content: Thanks, yes. I discovered that the hard way.I got the monitor together, and it works more often than with the old board, but here's where it gets really weird:I believe I've narrowed down the trigger of the symptom to pop-up video windows that start playing on certain websites. Does anyone have any idea why that would cause HDMI drops and/or whether there's a real fix (aside from disabling that feature in my browser).

author: Hogwild
author_rank: Regular Contributor
timestamp: February 28, 2025, 04:23:37 am
content: Some more Googling suggested possible workarounds. One involved reducing the refresh rate of the monitor. I did that, and so far, haven't had any more HDMI drops for a couple of days. We'll see if it lasts.

author: wraper
author_rank: Unknown
timestamp: February 28, 2025, 04:29:43 am
content: Probably half of some HDMI differential pair is fried. Often it still keeps working but unstable or with artifacts.

author: Hogwild
author_rank: Regular Contributor
timestamp: March 03, 2025, 09:58:56 pm
content: Not a single HDMI drop after several days. It seems, at least so far, that changing the refresh rate was a valid workaround. This makes me think that when I buy a new monitor one day, I'd better test it with higher refresh rates, or I might need to return it.