So I was 'gifted' a deadish AMW display from work. After examining it, all the caps look like they're in decent shape. No leakage or bulging. It powers on and it will show a clean display momentarily as in about 2 seconds. Then the displays blanks out. If I use the power button, power it off and power it back on immediately, it will show a clean display again for about 2 seconds again and then 'die'. (Clean display meaning an actual display of a Windows desktop).
I'm wondering if the backlight is bad. A quick look at Digi-Key shows some universal backlight replacement pieces and...
badcap400
Member
Last Activity: 04-25-2023, 01:36 PM
Joined: 09-18-2015
Location: los angeles, ca
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Re: New Members - please post your introductions here
Hello, long time lurker from the hot San Fernando Valley. Back again, yet again looking for the missing smoke. -
Norecent LM965WA power led
Hello, so I just inherited an old Norecent LM965WA. It works but the power led keeps flashing green and yellow over and over. In addition, when a pc is booted the screen will show the initial boot for a moment and then black out. If one presses the power button, then screen comes back. Once the pc is fully up, no problems other than the flashing power led (green and then yellow, then back to green, repeat until pc is powered off).
If I press the 1 menu button and hold, the led stays green. If I press the 2 menu button nothing happens (power led keeps flashing). In either case,...Last edited by badcap400; 09-27-2015, 03:33 PM. -
Re: bad Dell 1504p monitor
ok, white pins from right to left (ie from the 1st pin next to the grey pin) 0v, 13.2v, 13.2v,13.2v, 13.2v, 9.7vLeave a comment:
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Re: bad Dell 1504p monitor
ok, well, posted too soon. Looks like the inverter board has at least 1 probable bad transformer which was hidden by a plastic film cover. Here's the pix :
I took a shot of the edge of the inverter board where some translucent clear crud appears to have leaked from one of the transformers. In addition, on both transformers where there are 2 blue poly caps (HF224 / HC5012A), there's some dark brown discolored material between the caps and the transformers. Probably have to replace the whole thing as I wonder if the transistors on the other...Last edited by badcap400; 09-21-2015, 07:08 PM.Leave a comment:
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Re: bad Dell 1504p monitor
Ok, so I pulled it apart again and measured the 400v cap legs at 165.1vdc. Will upload some pix in a bit. Maybe the transformers? The boards look ok in general; no burnt crud or darkened bits. Only the epoxy on the 400v cap was dark. Will post a pic of the bad cap too.Last edited by badcap400; 09-21-2015, 06:07 PM.Leave a comment:
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Re: bad Dell 1504p monitor
Yes, the 400vdc is laying on its side. I'll be careful when measuring; it's just that the way the board is arranged in the unit, it's 1 of 3 separate boards and it has to be exposed in order to see the correct leads. Could be done from the back....just a bit of a pain because of the way of the whole arrangement is.
Actually, I could just pull the thing out entirely, separate it from everything else like the daughter and logic board, and then just power it while it's on my test bench by itself. Not having any load on it, wouldn't be a big deal?Last edited by badcap400; 09-19-2015, 12:22 AM.Leave a comment:
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Re: bad Dell 1504p monitor
Ok, I'll have to take some time out to get the pix. I might be able to get the old cap out of the trash still. And I'll have to buckle down to get those measurements, have to get the daily essentials out of the way (kids and all!). Should that main cap DCV be measured while powered on or powered off-disconnected. It's a pain to flip the powerboard out of the mount and still have power on.Leave a comment:
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bad Dell 1504p monitor
Hello all, I have a bad Dell 1504p monitor. It has no power led response whatsoever after the office had a power hit/surge. When I opened it up, I found a bad CapXon 100uf / 400v capacitor that had popped its top. Fast and easy, I figured, simple replacement. So I got a nice spare Nichicon unit in place, put the thing back together as nothing else appeared bad. However, I wasn't sure since many people have posted about problems with the daughterboards / mosfets on these. And, unfortunately, when I plugged it in, nothing happens.
So, I suppose that there are probably some bad diodes... -
Re: New Members - please post your introductions here
Hello, joining again after a couple of years of being away. Couldn't remember my old login and my emails don't seem to generate any responses from the recognition system so just restarted. Still diddling with caps.....Leave a comment:
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