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Qnix QX2700 27" Korean monitor review - Page 14

post #131 of 195
Quote:
Originally Posted by speck55 View Post

Yes. Let me get you the ebay seller and product name. If by "lose focus" you mean blanking out and light goes red for a couple seconds every few minutes?

Not quite, the light stays green but the entire screen distorts.
post #132 of 195
Quote:
Originally Posted by TFSnameless View Post

Not quite, the light stays green but the entire screen distorts.

Hmm. Have you tried a different dvi cable? The power brick - is it the one with the sticker saying "110v is acceptable" and the factory label says 200-230v in? Still a $25 delivered power brick is cheaper than shipping it back.
post #133 of 195
this one only says 220 and 230v but I tested it with a multimeter and it outputs 24v when plugged into 110v, although others have gotten the same powersupply with a 110v sticker. I don't suspect the dvi cable as being the problem as any problem with it would be apparent immedately not after 30-60 mins of use.

edit: I have already ordered a replacement since even if it isn't the power supply, these things seem to have a high failure rate anyways and aren't ce/ul so if they do cause a fire insurance might not cover it.
post #134 of 195
Quote:
Originally Posted by TFSnameless View Post

Not quite, the light stays green but the entire screen distorts.

Sounds like you need another DVI cable.

Strange, I never heard of this problem.
post #135 of 195
Quote:
Originally Posted by Koehler View Post

Sounds like you need another DVI cable.
Strange, I never heard of this problem.

You would think that, but the distortion doesn't happen right away, but happens after the power brick has gotten warm and putting the power brick in a cool spot extends the time required before it distorts, so I can't imagine it being anything other than the power brick.
post #136 of 195
Heres what happens when I left the monitor on for about 20-30 mins after it started distorting.
post #137 of 195
Quote:
Originally Posted by TFSnameless View Post

this one only says 220 and 230v but I tested it with a multimeter and it outputs 24v when plugged into 110v, although others have gotten the same powersupply with a 110v sticker. I don't suspect the dvi cable as being the problem as any problem with it would be apparent immedately not after 30-60 mins of use.
edit: I have already ordered a replacement since even if it isn't the power supply, these things seem to have a high failure rate anyways and aren't ce/ul so if they do cause a fire insurance might not cover it.

How clean and consistent under load is that 24v? If these things are barely operating within their tolerances to deliver that 24V, besides the extra-warm smelling power brick, as the supply heats up, that voltage may vary, and may "sag" under load - meaning when you plug your monitor in and it's driving the panel, backlight, driver board, it may sag below 24V - the "sag" under load is commonplace, and may be extremely so given we're operating these bricks out of range. Add heat buildup due to probably the guts working extra hard (VRM's etc), and as the power brick warms, the degradation may be too much for the driver board to handle.

Good point on the CE/UL, though if these things were the source of the ignition, I doubt there'd be much left of the label wink.gif - seriously though, it isn't worth the loss of life to find out. The ones I ordered didn't list UL approval, they were stamped CE with no listing # though. But they won't keep my coffee piping hot so I'm much more comfortable.
post #138 of 195
Quote:
Originally Posted by speck55 View Post

How clean and consistent under load is that 24v? If these things are barely operating within their tolerances to deliver that 24V, besides the extra-warm smelling power brick, as the supply heats up, that voltage may vary, and may "sag" under load - meaning when you plug your monitor in and it's driving the panel, backlight, driver board, it may sag below 24V - the "sag" under load is commonplace, and may be extremely so given we're operating these bricks out of range. Add heat buildup due to probably the guts working extra hard (VRM's etc), and as the power brick warms, the degradation may be too much for the driver board to handle.
Good point on the CE/UL, though if these things were the source of the ignition, I doubt there'd be much left of the label wink.gif - seriously though, it isn't worth the loss of life to find out. The ones I ordered didn't list UL approval, they were stamped CE with no listing # though. But they won't keep my coffee piping hot so I'm much more comfortable.
That's what I figure is happening, I'll report back once the new power supply comes in, which I suspect will fix the problem. Even if these replacements aren't of amazing quality, I have no doubt they will operate better than the dollar parts bin supplies these things ship with.
post #139 of 195
Quote:
Originally Posted by TFSnameless View Post

Heres what happens when I left the monitor on for about 20-30 mins after it started distorting.

Do you know if anyone else has the same problem? I don't know what's causing your problem. Maybe it's because of overheating.
post #140 of 195
Quote:
Originally Posted by Koehler View Post

Do you know if anyone else has the same problem? I don't know what's causing your problem. Maybe it's because of overheating.
No I've never heard of this problem before, but it could be my power brick is failing in a unique way :/.
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