Dimension 8400 broken power switch

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Dimension 8400 broken power switch

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Is this an accessable fix?  Is it possible to purchase a new power switch?  If not, any work around?

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  • astrohoof

     The Dell p/n Y1224 - Control Panel, with power button, for Dell 8400 Computers, can be purchased from HERE

    The power switch and circuit board is one unit. Dell has not published a guide to remove the front bezel of the Dimension 8400, you can use this GUIDE, it's for an Optiplex GX50 Small Mini Tower, the procedures are the same.

     A hint: The Dimension 8400 also, has a Hex headed screw on inside right side of front bezel/panel, just below the front USB ports, holding the front panel to the metal chassis, this MUST be removed and is not mentioned in the guide.

    Bev.

     

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  • Bev:  Wow, What marvelous help!  I've already ordered the control panel via your provided link!

    I also really appreciate the pointers on getting the front bezel off!  You are a life saver.

    Thanks a bunch,

    Dennis

  • Dennis

    Happy to have helped.

    Bev.

     

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  • I've a dead power switch on my Dimension 8400 too...

    Do you happen to know the pin-out configuration of the front panel connector?

    Such that I might be able to power up the Dimension by shorting the power switch pins?

  • The front panel is not Pins.  The power button goes to a 16 pin ribbon cable to a U1456 Board

     There is a 20 pin ribbon connector that goes to a front panel board W3300.

    Pinouts are not available not posted for any dell.

    Helps to know What Model Case.   The Dells have a Naming Convention.  Most 8400 used the Skydive Tower Chassis.

    Dimension 8400 Front I/O USB Audio Panel Board M5989

    Dell M5989 Dimension 8400 Front USB Audio I/O Panel

    Dell Optiplex GX280 Sm MiniTower Front I/O Control Panel, Dell W3300

    Dell Optiplex GX280 Sm MiniTower Front I/O Control Panel, Dell W3300

    Dell™ OptiPlex™ GX280 Systems User's Guide

    1

    U1456 cable connector

    4

    securing screw

    2

    front-audio cable connector

    5

    chassis-intrusion switch cable connector

    3

    Motherboard cable connector

    6

    internal speaker cable connector

    The Power Button U1456 is on another board that goes to the Control panel which then goes via ribbon cable to
    the motherboard. 
    Dell OptiPlex GX280 LED Power Control Board w/ Cable, Dell U1456

     

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  • Sorry, I meant the pin configuration for the ribbon connector on the motherboard. My simplistic plan was to just remove the ribbon to expose the pins and then short the power pins with a screwdriver to boot up the dimension... :) Thereafter, go into the bios and configure it such that it will power on when electricity is restored. Not sure if this is a futile idea?
  • kun1he2

    Dell has never published the pin outs of their front panel connectors/cables.

    Bev.

     

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  • U1456 Via 16 Pin Ribbon plugs into > M5989 Board then Via 20 pin Ribbon Plugs into >motherboard.

    You would have to reverse engineer the 2 boards and ribbon cable to figure out which goes where.

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  • Thanks, realised that that was the case...

    But I guess it is still possible that someone here might have mapped out the pin configuration on their own accord?

  • kun1he2

    Thanks, realised that that was the case...

    But I guess it is still possible that someone here might have mapped out the pin configuration on their own accord?

     
    kun1he2
     
    Maybe, but I've never seen this listed on DCF, try using Google.
     
    Bev.

     

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  • Seeing as the Pins are VERY VERY TINY for the Front Panel Ribbon I do not believe that anyone ever tried this.

    If I Did do such a thing it would be to the Pins on the 16 pin header which are inside on the back face of the machine

    ITEM #1

    With a meter it should be possible to trace the push button pins on the Front Control Panel Board.

    HOWEVER Given the AGE of this system its much more likely that the power supply is bad.

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  • Not sure if this link actually holds the key?

    scarvell.net/.../index.php

    Which pins do I short to simulate a power button press?  Pin 20 and... ?

  • That Link is a good Guess.   OM686:Dell 0M686 GX260 TOWER Front USB Audio Panel is the same on the GX280 and Dimension 8400 etc with SKYDIVE Mini Tower.  I don't see an exact correlation between this and the power switch however.  If you guess wrong you may damage things. 

    Looks Very Similar to

    http://www.lnmdesign.com/400sc/front_pnl.html

    Front Panel

    Located halfway up under the front bezel section with the ventilation holes.

    Photo available of the backside and a super-duper overlay and a bigger size front.

    Connector List:

    • CTRL_PNL: Control Panel connector, 16-pin, two-row, jumper-spaced, Pin 1 is missing, blocked on the connector.
    • FNT_PNL: Front Panel (connects to motherboard). 34-pin, two-row, tight-spaced, Pin 21 is missing.
    • AUDIO_CABLE: Connects to motherboard. Single-row, 10-pin, tightly-spaced; Pin 7 is missing.
    • INTRUDER: Connects to the chassis intrusion detector switch. Single-row, 5-pin, jumper-spaced. 5-pin version of the 4-pin CD-AUDIO connectors.
    • EXT_SPK: Optionally connects to external speaker.
    • HP_OUT: Headphone out. Stereo 3.5mm jack.
    • USB_FNT: Front USB connectors. Double USB connector.

    CTRL_PNL

    See Control Panel documentation.

    From the pin-side:

    Pin Description Connects to FNT_PNL Pin
    1 Removed and blocked on the connector
    2 PWR SWITCH LEFT SIDE (Both) 20
    3 GND GND
    4 HDD LED NEG 22
    5 PWR LED GREEN POS 23
    6 HDD LED POS 5 thru R19
    7 GND GND
    8 ESUP SWITCH RIGHT SIDE (Both) 28
    9 PWR LED YELLOW POS 27
    10 N/C
    11 GND GND
    12 N/C
    13 ESUP LED NEG 24
    14 ESUP LED POS 5 Thru R20
    15 GND GND
    16 GND GND

    FNT_PNL

    From the pin-side:

    Pin Description Connects to
    1 INTRUDER 3 INTRUDER 3, FNT 32
    2 VCC ?? FNT 3, FNT 4
    3 VCC ?? FNT 2, FNT 4
    4 VCC ?? FNT 2, FNT 3
    5 LED VCC CTRL 6 thru R19, CTRL14 thru R20
    6 ?  
    7 ?  
    8 INTRUDER 5 INTRUDER 5
    9 GND GND
    10 GND? GND?
    11 GND GND
    12 ?  
    13 ?  
    14 GND GND
    15 ?  
    16 GND GND
    17 ?  
    18 ?  
    19 GND GND
    20 PWR SWITCH LEFT SIDE (Both) CTRL 2
    21 Pin removed
    22 HDD LED NEG CTRL 4
    23 PWR LED GREEN POS CTRL 5
    24 ESUP LED NEG CTRL 13
    25 GND GND
    26 ?  
    27 PWR LED YELLOW POS CTRL 9
    28 ESUP SWITCH RIGHT SIDE (Both) CTRL 8
    29 GND GND
    30 INTRUDER 1 INTRUDER 1
    31 EXT_SPK 2 EXT_SPK 2
    32 INTRUDER 3 INTRUDER 3
    33 EXT_SPK 4 EXT_SPK 4
    34 EXT_SPK 1 EXT_SPK 1

    AUDIO_CABLE

    From pin-side:

    Pin Description Connects to
    1 GND GND
    2 OUT LEFT 3.5 jack tip
    3 GND GND
    4 OUT RIGHT 3.5 middle ring
    5 GND GND
    6 ?  
    7 Pin removed
    8 ?  
    9 ?  
    10 GND GND

    INTRUDER

    From pin-side:

    Pin Description Connects to
    1   FNT 30
    2 GND GND
    3   FNT 1, FNT 30
    4 GND GND
    5   FNT 8

    EXT_SPK

    From pin-side:

    Pin Description Connects to
    1   FNT 34
    2   FNT 31
    3 GND GND
    4   FNT 33

    HP_OUT

    From solder-side:

    When unconnected to a 3.5 jack:

    When connected to a jack:

    Pin Description Connects to
    1 SENSE GND if connected, otherwise Base Ring (floats)
    2 GND GND
    3 SENSE GND if unconnected, otherwise floats
    4 SENSE GND if connected, otherwise Base Ring (floats)
    5 GND GND
    6 SENSE GND if unconnected, otherwise floats
    7 Left channel Tip
    8 GND if connected, otherwise floats Base Ring
    9 Right channel Middle Ring

    USB_FNT

    This I cannot be bothered with, way too many surface mounted components. You are welcome to drop me an email (@ 400sc-at-peterlada-dot-com) if you draw a circuit diagram, or have any info.


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