Re: Viewsonic VX2245WM - White screen
Plugged it up again and RTD2553v chip is physically hot. What might cause that?
ndawgtkd
Member
Last Activity: 12-28-2019, 03:26 PM
Joined: 09-19-2012
Location: Jacksonville, FL
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Re: Viewsonic VX2245WM - White screen
I just converted it to LED, and they are activating. Before I started this project the LCD would display even though the backlights would not turn on. Please see previous thread for pinouts and voltage readings. I'm not sure if one of them needs to be pulled low, however if I disconnect the LED control board the LCD still does not have any video out.Leave a comment:
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Re: Viewsonic VX2245WM - White screen
I have carefully inspected both flex cables from the logic board for damage as well as all of the hot-knifed connections to the LCD and see no damage. Any advice?Leave a comment:
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Re: Dac-19m009
Budm, I started a new thread to address the LCD, pictures will be posted there shortly:
[url]https://www.badcaps.net/forum/showthread.php?t=55534[/url]Re: Dac-19m009<br /> <br /> Budm, ...?t=55534[/url]Leave a comment:
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Viewsonic VX2245WM - White screen
Just completed a LED conversion on this monitor ([url]https://www.badcaps.net/forum/showthread.php?t=55502[/url]). Display was working before the conversion, and at various points that I tested throughout, however upon completion I have no video output. I tried 2 DVI cables, to be sure. I am unable to view source selection or the menu.
I tested various vcc points on the board running the length of the LCD, and they all read around 3v, however the outputs on each channel (1out1, 1out2, 2out1, 2out2....etc) each read around -150mv. I do not see a fuse on this board at all.
...Last edited by ndawgtkd; 07-12-2016, 07:03 PM. -
Re: Dac-19m009
I got the LEDs working, but now I have no picture. This thread can be closed, I will open a separate thread to troubleshoot the LCD.Last edited by ndawgtkd; 07-12-2016, 06:38 PM.Leave a comment:
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Re: Dac-19m009
Thanks for the clarification. I've poured through the schematics for the DAC-19M008 and 005 boards as well as several other forum posts, since I can't seem to locate a schematic for 009 and I believe that I have a slightly better understanding about what is going on. I will take a shot at it tonight and post by my results. Thank you very much for your patience, clearly I only have a very rudimentary understanding of what I'm doing and I really appreciate you pushing me in the right direction.Leave a comment:
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Re: Dac-19m009
I removed the rest of the components to try and make room for the new inverter board, but it seems somehow I damaged the 5v circuit in the process. Can you clarify your previous reply, 'Those two 8-pin Power MOSFETs has to effect on the 5V supply' Did you mean 'no' effect? Sorry for my ignorance. I'm trying to understand as best as I can.Leave a comment:
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Re: Dac-19m009
Ok, so in that case I should go with the original suggestion and run it with the fuse removed, but the transformers and mosfets installed? Could I have damaged anything by turning on the supply with the fets, transformers, and caps removed?Leave a comment:
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Re: Dac-19m009
Hey Bud, I will take pictures of my specific board when I get home today, however here are some high-res photos of yours that I found for this particular board, same revision and version:
[url]http://s807.photobucket.com/user/budm/library/Delta%20power%20supply/Delta%20DAC-19M009%2001A%20AF?sort=3&page=1[/url]
I removed the 2 transformers in the upper left of the board, the 6 blue capacitors, and the 2 8 pin chips, as well as the fuse and the 4 lamp ports shown here:
[url]http://s807.photobucket.com/user/budm/media/Delta%20power%20supply/Delta%20DAC-19M009%2001A%20AF/DSC01836_zps1373e685.jpg.html?sort=3&o=19[/url]...Last edited by ndawgtkd; 07-12-2016, 11:31 AM.Leave a comment:
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Re: Dac-19m009
I removed the 2 transformers, the 6 blue caps, the fuse, and the 2 8-pin mosfets. I now no longer have +5v at the output to the logic board. I still have 14v on the 13.8v pin. I replaced all removed components, however there is still no +5v. Any suggestions?Leave a comment:
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Re: Dac-19m009
I don't have a great grasp on reverse engineering power supplies, so please bear with me. I found an old thread that you assisted with as well referencing removing the transformer and 8-pin mosfets. From what I could translate from online it looks like the 2 transformers and 2 8-pin chips next to them in the upper left of the board are what you're referring to, correct?Leave a comment:
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Re: Dac-19m009
The board looks almost identical to the board that you posted, however it does have the bottom portion populated with an audio control circuit. I removed the glass fuse that was listed on the pdf, is there anything else that I could / should remove from the board? I am seeing 22 volts at the 14v B+ probe point, and I hear a high pitch whine coming from the PSU when disconnected from the logic board, is this something that I should be worried about?Last edited by ndawgtkd; 07-11-2016, 07:19 PM.Leave a comment:
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Re: Dac-19m009
The LED inverter board is CA-155 REV:02
DAC-19M009 AF Rev 01A
From the information I can gather online:
ENA - enable / disable the backlight 0 - 3,3V (yellow)
DIM - adjust the brightness of the LEDs 0,8 - 2,5V (yellow)
I'm not sure how to determine if it is PWM or Analog, nor am I sure if it is active low or active high. I am connecting to the pins that feed the logic board, that probably explains why the PSU shuts off after the LEDs turn on, but works fine with them disconnected. In the...Last edited by ndawgtkd; 07-11-2016, 06:42 PM.Leave a comment:
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Re: Dac-19m009
The 2nd character doesn't look like it could be an N, but I suppose it could be a mis-print. To test I wired the enable directly to a 5V source, but I ended up getting the same results, as soon as the LEDs power up the PSU turns off.Leave a comment:
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Dac-19m009
I have an old Samsung display that the CCFLs broke in. I decided to go the route of converting to LED instead of ordering new CCFLs and installing. At this point in time I have the board wired to the PSU's output pins to the display board. I found a 13.8V source (LED inverter shows that it needs 10-30V), and a ground, as well as outputs silkscreened to say:
EVA (Could be EUA)
DET
ADJ
My assumption is that Dimm would be jumped to ADJ and On would be jumped to DET.
I got everything wired up and turned on, and the LEDs flash momentarily and... -
Re: Spectroniq PLTV-3250 wont start
See page 5....Leave a comment:
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Re: Spectroniq PLTV-3250 wont start
So if ZD3 is in fact a 15V Zdiode would [url]http://www.digikey.com/product-detail/en/BZX384-B15,115/568-3812-1-ND/1163093[/url] be an acceptable replacement? I am very uncertain as to which parts can be replaced with what so I have been trying to replace everything exactly. This is the only part that it doesn't seem I will have the chance too.Re: Spectroniq PLTV-3250 wont start<...e replacement?Leave a comment:
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