Re: dell 172fpt 23v but no 5v
I'm not having any problems opening the attachment to post #17. Are you?
PlainBill
Originally posted by alexanna
PlainBill
-
For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic. -
Re: dell 172fpt 23v but no 5v
Wow Its there now. There was also some one else that was having trouble opening attachments it must be fixed.
Al.Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!
Comment
-
Re: dell 172fpt 23v but no 5v
i find it hard to believe that the 23v line is not only there but in regulation with the 5 gone.the +5 is where feedback comes from.and your lightbulbs cold resistance is likely to trip the ocp.are you sure you are testing at the correct point?Comment
-
Re: dell 172fpt 23v but no 5v
Well I think so.Originally posted by kc8adu
My ground lead is hooked up to the heat sink of the of the two schottky diodes ,D820 and D813
I measure continuity from the heat sink to the negative side of the capacitors for the 5v, and the 12v or 23v capacitors whatever it is suppose to be? The positive lead is hooked up to the center leg,O r # 2 leg. Of the diode.
I might be making a little bit of progress here .I have done some resoldering as PlainBill suggested. I have removed the thru hole components around the surge diode and resolderd them, Including the smps coil.
At this time my 5v has come back,The power Led is coming on,But after a very short time it starts to flash and I am noticing A squealing noise around the octocoupler.I haven't done it very long but the back lamps of my test panel will flash at the same rate as the power green led and the squealing noise.I still measure 23v on the center leg of D820 #yg902c2 diode.
I don't know if this got hit by lighting or there was a hell of a power surge,And its only a 17” monitor so how much time and money dose one invest? But I am not one to give up on things
I am unsure if any of the things I have mentioned will be of any help But at this moment this what's happing
Al.Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!Comment
-
Re: dell 172fpt 23v but no 5v
The other diode next to d815... I'd replace it as well just cause it's cheap to do and in the same circuit.
And the transistor on the AL heatsink... test it carefully. I'd think it and/or the transformer T802 would be damaged. It may not be totally fried, just failing. Or it could be the pwm controller. If you have a scope, check the signal on the gate of the afore-mentioned transistor.Comment
-
Re: dell 172fpt 23v but no 5v
No to scope.But I should have enough spare good parts around here to try the other diode.I am just trying to keep the replacements to a minimum. the more i do the more of a chance I have of realy screwing some thing up.
Thanks Al.Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!Comment
-
Re: dell 172fpt 23v but no 5v
Huston we no longer have a problem!!!!
I went ahead and replaced the thru hole diodes in the question area. no more blinking and or squealing and the test panel back lamps are working I have not hooked up lcd panel yet but at least I've got back lamps. I am reading a good steady 5v on one of the schottys. I am still reading around 23v on the other. I am going to let this run a little longer on the bench before I completely reassemble.
Thank you so much PlainBill and
kc8adu and el3ctroded.
Al.Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!Comment
-
Re: dell 172fpt 23v but no 5v
Thank me? I was spending the day in the pool!!! Glad to hear it's working.Originally posted by alexanna
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
-
Comment
-
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.
I got a Dell Latitude 5420 (Service Tag: 7RFM6D3, Motherboard: GDF40 LA-491P Rev.: 2.0 (A01)) which does not start and I want to repair it. These are the symptoms:
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.
The power/battery... -
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... -
Well I've learned something new today. Of all the Dell laptops I've come across I have never seen bluetooth greyed out, and only to learn this is during the build from Dell factory. I've tried to pull the original BIOS and fix with another dell with the same issue on the forums, however the original was not recovered from the forum upgrade so I cannot do a comparison to attempt the fix on my own.
If someone could help me out with this unit and I'll try the next one as so far I have 2 on my desk with this issue. Thanks in advance!
Dell Lattitude 5410
Service Tag...Today, 01:28 PM -
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...
Comment