Forum: Troubleshooting Computer Displays
07-18-2017, 01:07 AM
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Replies: 108
Views: 27,267
Re: HP ZR2740w almost dead
OK, there's good news and bad news for you:
Good news:
- that problem is almost definitely the connector. You caught it open circuit once, but now its working. This means you don't need to find...
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Forum: Troubleshooting Computer Displays
07-17-2017, 03:31 PM
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Replies: 108
Views: 27,267
Re: HP ZR2740w almost dead
This was a while ago.. I just remembered I put more info on the repair here:
http://www.badcaps.net/forum/showthread.php?p=758118#post758118
Btw, if anyone has one of these for parts, I'd like...
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Forum: Troubleshooting Computer Displays
07-17-2017, 03:26 PM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
07-17-2017, 02:52 PM
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Replies: 108
Views: 27,267
Re: HP ZR2740w almost dead
Yes, that is also quite likely. The connector they put on is rubbish. On the 1st one i fixed the original fault was a dry joint on this, but then i cracked the top off a few LEDs trying to remove the...
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Forum: Troubleshooting Computer Displays
07-16-2017, 05:27 PM
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Replies: 108
Views: 27,267
Re: HP ZR2740w almost dead
Hi Snout.
OK, well i bet your problem is the same. Yes, I did fix it by replacing the LED(s). My instructions you quoted show you how to take it apart and get to the LED strip.
One test you...
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Forum: Troubleshooting Computer Displays
04-30-2017, 05:53 PM
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Replies: 5
Views: 1,680
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Forum: Troubleshooting Computer Displays
04-29-2017, 05:29 PM
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Replies: 3
Views: 3,152
Re: LM270WQ1 SD F1 - iMac 27in A1419 LCD
Its almost the same panel as in the HP ZR2740W monitors i have. Mine is LM270WQ1-SDDA. *Perhaps* some chance you could swap the TCON from one of these if you find a broken one on eBay. They are...
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Forum: Troubleshooting Computer Displays
04-29-2017, 05:11 PM
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Replies: 25
Views: 6,848
Re: Transformer for HP zr24w
No, that is normal; put it back!
The resistance (i.e. impedance @ 0Hz) is expected to be low but the impedance at its operating frequency (many kHz) will be fine. If the transformer were open...
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Forum: Troubleshooting Computer Displays
04-29-2017, 04:58 PM
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Replies: 24
Views: 8,565
Re: HP ZR2440w backlight cutting out
Ginko - you have a very similar problem and circuit to the one i am trying to diagnose (http://www.badcaps.net/forum/showthread.php?t=61635). From your pics I can see the ZR2440W is like a cutdown...
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Forum: Troubleshooting Computer Displays
04-14-2017, 06:05 PM
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Replies: 5
Views: 1,680
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Forum: Troubleshooting Computer Displays
04-14-2017, 03:08 AM
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Replies: 5
Views: 1,680
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Forum: Troubleshooting Computer Displays
04-13-2017, 06:07 PM
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Replies: 5
Views: 1,680
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Forum: Troubleshooting Computer Displays
04-13-2017, 04:22 PM
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Replies: 5
Views: 1,680
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Forum: Troubleshooting Computer Displays
02-15-2017, 06:09 PM
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Replies: 108
Views: 27,267
Re: HP ZR2740w almost dead
OK i got it done and am posting a little more info in case anyone else has the misfortune to try to fix one of these panels. I wouldn't bother unless you are already very experienced at fixing such...
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Forum: Troubleshooting Computer Displays
02-15-2017, 05:41 PM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
01-24-2017, 05:26 PM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
01-18-2017, 03:56 PM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
01-17-2017, 06:04 PM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
01-15-2017, 09:58 AM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
01-14-2017, 05:20 PM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
01-14-2017, 12:30 PM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
01-14-2017, 12:26 PM
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Replies: 108
Views: 27,267
Re: HP ZR2740w almost dead
OK well I now realize the LEDs may be unique to certain panels. These ones are also effectively on a heatsink with a 3rd pad which makes them difficult to get off the PCB as the heat is dissipated....
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Forum: Troubleshooting Computer Displays
12-29-2016, 04:22 PM
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Replies: 22
Views: 5,676
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Forum: Troubleshooting Computer Displays
12-29-2016, 04:11 PM
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Replies: 108
Views: 27,267
Re: HP ZR2740w almost dead
Thanks for the soldering tips. I'm very experienced with through-hole but not much with SMD. I am fairly confident I'll work that out.
However, I'm still drawing a blank trying to find a suitable...
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Forum: Troubleshooting Computer Displays
12-28-2016, 05:15 PM
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Replies: 22
Views: 5,676
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