• DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

It is currently 14 November 2025, 14:12

DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

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  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
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#1 DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by valieromarco • 5 November 2025, 00:36
This computer power on with amber power button led and after 10 seconds blinking 2 amber short (pause) 1 amber short.
All voltages are present except four coils near CPU 0V
CPU is cold.

Resistance to ground of those coils see the picture.
Without CPU all value of those coils are fluctuating up and down.

Removing CPU the last time one pin is bent but the fault was before.
Maybe I can repair it.


Image

Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by Google Adsense [BOT] • 5 November 2025, 00:36

#2 Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by matic • 5 November 2025, 08:16
valieromarco wrote:the last time one pin is bent
Hello!
Please post a clear picture of the CPU socket at a 90° angle.

#3 Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by valieromarco • 6 November 2025, 00:30
Image

Image

Image


Image

Image

the socket pin has been damaged now.
There was this motherboard issue just I got the pc and it was unopened.

#4 Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by Sothoth • 6 November 2025, 09:48
W sockecie CPU jest wyłamany PIN. Zmierz oporność do masy na wyłamanym PIN-ie. Byćmoże jest on do wymiany (lub cały socket CPU)

#5 Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by valieromarco • 7 November 2025, 08:13
As I already told the pin was broken after the issue of blinking 2 amber (pause) and one amber continuously.
So issue was before of pin damaged.

#6 Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by matic • 8 November 2025, 13:12
The broken pin is connected to the VCORE of the CPU, so the board should work even without this pin.

Please, post a clear picture of the marked area of the board with visible markings on the chip (picture source: ebay.com):
Image

#7 Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by valieromarco • 8 November 2025, 23:51
Image

Image

#8 Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by matic • 10 November 2025, 08:31
Measure the voltages to ground on pins 2, 3, 4, 5, 7, 9, 12 of chip PU89001, when the board is turned on with the CPU connected.

#9 Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by valieromarco • 11 November 2025, 00:23
2 = 3,3V
3 = 0,5V after 2 seconds 0,7V after 2 seconds 0,5V continuously
4 = 0,5V after 2 seconds 0,7V after 2 seconds 0,5V continuously
5 = 0,5V after 2 seconds 0,7V after 2 seconds 0,5V continuously
7 = 5V
9 = 19V
12 = 1V

Re: DELL OPTIPLEX 3050 motherboard DB-MFF-BF NO BOOT

by Google Adsense [BOT] • 11 November 2025, 00:23
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