Hi all,
A few weeks ago I bought a defective Samsung 2494HM, last weekend I managed to fix it. I have used it every night this week without any problem whatsoever. Looks like a confirmed definitive repair! Anyway, here's the story.
This monitor had developed the '2 sceond to black' problem. I suspected bad caps, but after opening they looked fine. The CCFL's proved to be OK when testing on a known good PSU. The fault turned out to be in the inverter transformer, a TM10176. This one has 1 primary and 2 secondary windings in one housing. The secondaries showed a big difference in resistance, one was about 1000 Ohm (as it should be), the other more than 3000 Ohm.
Searching on the net I found a replacement in an Ebay webshop, cost just shy of US$6 (excl. Paypal cost, that is). Ordered it (free shipping) and received it in the mail after only 2 weeks. It looks identical to the original one, good build quality judging by outward appearance.
After swapping the transformers the monitor came right back to life and has run without a hitch since.
Nice display BTW, has VGA, DVI and HDMI inputs, and even a small audio amp with 2 (equally small) loudspeakers.
What amazes me, though, is that one of the secondaries developed a higher resistance. When malfunctioning you'd expect it to go infinite, not just to 3000 Ohm. I would anyway, but then again, I don't have an education in electronics. Maybe one of the experts could shed some light on this subject?
re-atari
A few weeks ago I bought a defective Samsung 2494HM, last weekend I managed to fix it. I have used it every night this week without any problem whatsoever. Looks like a confirmed definitive repair! Anyway, here's the story.
This monitor had developed the '2 sceond to black' problem. I suspected bad caps, but after opening they looked fine. The CCFL's proved to be OK when testing on a known good PSU. The fault turned out to be in the inverter transformer, a TM10176. This one has 1 primary and 2 secondary windings in one housing. The secondaries showed a big difference in resistance, one was about 1000 Ohm (as it should be), the other more than 3000 Ohm.
Searching on the net I found a replacement in an Ebay webshop, cost just shy of US$6 (excl. Paypal cost, that is). Ordered it (free shipping) and received it in the mail after only 2 weeks. It looks identical to the original one, good build quality judging by outward appearance.
After swapping the transformers the monitor came right back to life and has run without a hitch since.
Nice display BTW, has VGA, DVI and HDMI inputs, and even a small audio amp with 2 (equally small) loudspeakers.
What amazes me, though, is that one of the secondaries developed a higher resistance. When malfunctioning you'd expect it to go infinite, not just to 3000 Ohm. I would anyway, but then again, I don't have an education in electronics. Maybe one of the experts could shed some light on this subject?
re-atari
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