Can't find a schematic for this. R902 and R905 are burnt out. Pics attached. Can anyone help me ID them?
Attached Files
-
-
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
Can't help a lot, but ...
That P/S was made by Newton Power, a division of Delta Products. Delta used to have - and may yet - a tech support office in the Portland, OR - Vancouver, WA area. You might try contacting them. If that office is no longer there, you might try contacting the Delta office in Fremont, CA, which has both sales and tech support people.
Resistors don't fry like that without a reason. Chances are, something else is shorted, and the resistors fried as a consequence.PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
****************************
To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
**************************** -
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
Thanks. That's good info. Of course you're right and resistors don't blow like that without something else causing it and I just found a blown surface mount IC on the bottom of the board. I won't be repairing this one. A replacement PSU for this PC is cheap enough.Comment
-
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
Looks like part of the 5SVB circuit.
I don't know if you will be able to find schematics. I think you're better off just posting more pictures here. If you have a multimeter, it may be possible to troubleshoot it.Comment
-
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
I was thinking the 5Vsb circuit as well - a "stand-alone" FET so close to that smaller transformer was a bit of a dead-giveaway.
I've got a hunch one of those two blown resistors goes to the gate of the FET, and the FET itself may well be shorted (i should know - i've made this happen myself, about a month ago
), perhaps also the source resistor.
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - ShenanigansComment
-
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
I appreciate the advice but I'm not really equipped or steady-handed enough to deal with such small surface mount soldering. Thanks for the help
Comment
-
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
Hi again OP .
I hope you still have the PSU in hand because i have the values of the burned parts , but i would like you to give me the values for the 3 resistors near the output cables just underneath the end of the rectifiers radiator ( R519 - R520 - R521) .
Thanks in advance.Comment
-
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
Yeah, I still got it around here somewhere. I'll let you know when I dig it up.
Comment
-
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
Not at this time.Comment
-
Re: Dell NPS-210AB A Rev 1 PSU blown resistors
Thanks , i will happily give any infos about your blown parts .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... -
First of all, I'd like to mention that I'm a novice when it comes to laptop repair, although I do have some experience with soldering.
One day, my laptop experienced a severe stutter, and after rebooting, it failed to boot into Windows. I decided to disassemble it and found that the PL900 component was blown. Later, I came across a post (https://www.badcaps.net/forum/troubl...error%E2%80%99) with the same problem, where...08-30-2024, 06:13 AM -
Hello,
My friend asked me to replace the wire going from this SMPS 20v adapter to the charger for a 18v Lithium Battery for a drill.
The cable had frayed and been touching, as a result the 5 Paralleled R200 (0.2 ohm) resistors had blown O/C, they are connecting the main -ve rail to the output wire.
The output was jumping around 13v and dis-appeared when a load like the charger was connected, they measured 900ohms.
I experimented by replacing at first a single 0 ohm and then a 2.2ohm in and the output was restored at 21.62v and 21.65v respectively... -
Hi,
Could someone help trying to unlock this BIOS, seems that Dell have changed the layout of new Dell Pro 8FC8 bioses from checking HXD - 4000 bits do not need changing, only 2000. However after FF the section starting from '01000' upto 2000 bits and then soldering the chip back it seems that the microchip on the motherboard is recovering the bios back to original settings after first boot. Has anyone found a way to crack this extra layer of security Dell have implemented? Seems both HP and Dell have upped bios security to match Lenovo by implementing extra measures on a separate... -
I would like to share my experience about charging issues with Dell power supplies with the tech community. I am working on a Dell Inspiron 5590, Mainboard 18778-1 with charging problems. The device can be switched on and works so far, only the message appears at startup:
Alert! The AC power adapter wattage and Type cannot be determined. The battery may not change. The System will adjust the performace to match the power available.
The power supply unit is not recognized in the Bios and the charging process is set to "idle". I use original Dell battery, type...
Comment