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Re: Dell E172fpb
As i'm new to electronics which is the startup cap?
http://s1063.photobucket.com/albums/...rent=DV172.jpg
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Re: Dell E172fpb
Did you recheck those transistors again to see if they are shorted out again and the tabs are not touching the chassis?
You can also remove the BEL FUSE which feed the B+ to the inverter circuits and see if the LED stays green with PC connected. Also check the value and leakage resistance of those 4 tuning caps by the 4 inverter transistors.Last edited by budm; 09-05-2012, 11:31 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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--- 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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Re: Dell E172fpb
Ok did i get i correct? VeeAttached FilesComment
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Re: Dell E172fpb
This Cap seems to be the probable issue so will get some in town tomorrow and replace it and others and see if i get a result.
Sorry macro on my camera is not that good but the large brown 35v 1000uf is the bulging one.
Missed it before when i replaced at the mofsets etc. VeeAttached FilesComment
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Re: Dell E172fpb
Replaced the large brown 35v 1000uf with units about 50% larger in size (just squeezed in) and the rest of the caps for the board are on order.
Fired it up anyway as will be a several days for stock to come in and it is working well. Yay
Will replace the others so i know i have all good quality caps and the board has been totally resoldered all over so hopefully no more problems. Thanks for all advice everyone and tutorials retiredcaps
. Vee
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Re: Dell E172fpb
How do i identify this part as it is now making a squealing noise and not all the time. It is T601 on the power board number on the sticker is 19.20267.001
Photo attached.
CheersAttached FilesComment
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Re: Dell E172fpb
That squealing noise may be due to bad main DC filter cap (that large black cap in the primary side). Put the meter in AC mode and take the voltage reading on the two legs of the cap, also take the DC reading as well.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Dell E172fpb
With this monitor its pretty hard to do as you cannot get to the otherside of the board but will give it a try. Must be a workaround.
Also noise is definatley emanating from the transformer i rolled up a sheet of paper and put the tube over it and you can hear the noise easy and nothing when i do the same to the large cap. Cheers VeeComment
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Re: Dell E172fpb
You can solder two wires to the leg of the cap and run them out to allow you to connect the probes to them, you MUST BE REAL CAREFUL! you are working in the LINE (HOT side) of the circuits. Do not touch any thing with your hands.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Dell E172fpb
Ok thanks will try that later and get back to you. Cheers VeeComment
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Re: Dell E172fpb
Well soldered on some extensions to the cap. We are 240v system in Australia
Its an Elite brand Cap 450WV 100MFD pc(m) 105c
Readings 331v DC
730v ACComment
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Re: Dell E172fpb
730V AC !!!!!!! measure again I suggest....Comment
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Re: Dell E172fpb
I tested each 3-4 times with same results as i wanted to be sure i got it correct.
Why would it say that?Comment
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Re: Dell E172fpb
Well obviously something is amiss,BUT trying to identify what,is not going to be easy.The DC input seems correct to give you the correct DC voltage on the cap.The first thing to do, although it may seem odd,is to measure the AC in the wall socket...we know its going to be about your 240v mains AC,BUT what does the meter actally read,on the AC range you used to measure on the Cap ??/Comment
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Re: Dell E172fpb
Meter reads at the socket fluctuates between 241-245v ac. I might just get a new cap and see if i get different readings would that be a good idea? Cheers VeeComment
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Re: Dell E172fpb
Monitor has been plodding on for months and have been waiting for something to give up but not the case. Just squeals like a pig once it starts to get warm so good for about 20min and then it starts it call!!
So today replaced the large black main cap in the photo the 450V 100mfd Elite branded with a japanese equivalent and did not make any difference.
Now to locate a tranformer in the photo if i can as thats were the noise is coming from for sure!! Anyone have any idea where i may get one?? Cheers VeeComment
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Re: Dell E172fpb
I just got one of these. Unlike most of you fellows, mine is doing thr 1 second to black issue.
If i shine a light at the screen, i can still see the image, and the green power led stays on solid so the monitor is staying on except for the backlight.
Should i tear it down and check these common suspect transistors anyways?
edit whoops this is a E173FPc maybe its not the same internally.Last edited by cadillacman; 03-18-2013, 06:31 PM.Comment
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My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?
Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?
My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
I have tried multiple different Dell power adapters. My Dell... -
Hello all,
this is my first post, so if I make mistakes please do not hesitate to point them out, thank you in advance.
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If the laptop is only connected to the AC adapter (battery removed):
When I press the power button, the keyboard backlight and the display backlight are turning on. Caps key light is lightning, but key does not respond to pressing it.
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I have a Dell Latitude 5530 with a damaged RJ45 network connector. See the attached pictures.
Have already searched on Farnell / Aliexpress / Ebay and had contact with several suppliers on Aliexpress and Ebay, but they cannot deliver this connector.
Is there someone inside the EU, who has these connector(s) or perhaps defective motherboard(s) for these laptop models I have mentioned in the topic title.
Pictures of these boards:
Dell Latitude 5520 https://www.ebay.com/itm/256052956663
Dell Latitude 5530 https://www.ebay.com/itm/125844181534
Dell... -
Hello!
I have a problem with a Dell G5 SE 5505 laptop that I hope someone can give me a few pointers on.
[OK, it's not really a laptop, I'm running the motherboard on my desktop with only cooling, RAM and an M2 drive attached.]
I had some performance issues, so I decided to update my BIOS from 1.7.0 to the latest version, 1.20.0.
The computer restarted and the update dit not want to continue without a battery connected, even though I used dell's method of bypassing this requirement.
I tried updating to a custom BIOS from Reddit user Satori_Nori https://www... -
Hi everyone,
I'm in need of assistance with a Dell Precision 5820 Tower. The BIOS is locked with "Dell Security Manager," preventing access to the HDD-1 hard drive.
**Background:**
I recently purchased this Dell Precision 5820 Tower from a recycler who salvages equipment from abandoned office spaces. The computer was left behind by its previous owner and was password locked. Given that it can run Windows 11, I saw this as an opportunity to upgrade my setup.
**What I've Tried So Far:**
1. I accessed...
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