i also have a vx922 with fluctuating power from the 12v rail between boards. i have replaced all caps but the large 400v. still the power goes from 12v to 4v and repeats over and over. and the screen and green power light blink in time with it. what else could be the problem?
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Re: vx922 recapped still fluctuating power
1) A clear focused picture of your boards using the manage attachments function would help. Please do not post inline as it slows down loading of pages.
2) If you disconnect the logic board and ccfls, does the power board (now standalone) have steady 12V DC?
3) What brand and series did you use for replacement caps?--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
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Re: vx922 recapped still fluctuating power
Sounds like a possible short in the system. Power supplies for this monitor were supplied by different manufactuers, so without photos, help will be limited. If it's the power supply I'm thinking about, with power off, try checking the 4 surface mount transistors under the board marked "DK"? for shorts. Post some clear focused photos of the top and bottom of the power board. Do not post them inline, use the "manage attachments" button.Comment
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Re: vx922 recapped still fluctuating power
is the circled fuse 1 supposed to be connected to the12v connector ? looks like the fuse moved , but is still connected well.
as for power when disconnected from the rest. no very minimal. when they are all connected, and the power switch is off, i get a steady 12.42v.
as for the type of caps, not sure it was all i could find at alfatronics. but i have all new panasonic fm caps comming from digikey soon.
thanksAttached FilesComment
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Re: vx922 recapped still fluctuating power
ok i sent the pics.
when i disconnect the power board completly, minimal voltage.
as far as caps....NRWA series M for the two 470uf 25v (mine are 35v), and another no name with just an M on it for the one 330uf 35v, also the 2 big caps on the logic board g-luxon 411b(M) 330uf 16v, and one sheng 100uf 25v on the logic board.
if i put it all together again and plug it in with the power switch off i get a constant 12.42 v on the 12v connector between boardsLast edited by blutch; 03-24-2011, 07:39 PM.Comment
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Re: vx922 recapped still fluctuating power
I guess it could be the angle or lighting, But 2 transistors look melted to me.Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!
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Re: vx922 recapped still fluctuating power
I give up. See
https://www.badcaps.net/forum/showth...773#post156773Last edited by retiredcaps; 03-24-2011, 11:56 PM.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅
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