IBM 8512 VGA Monitor, 12": Difference between revisions

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|C101, C201, C301
|C101, C201, C301
|3
|3
|ECE-A1EN470U
|ECE-A1EN470U / UES1C470MPM
|[https://www.digikey.com/en/products/detail/panasonic-electronic-components/ECE-A1EN470U/227620 DigiKey] [https://www.mouser.com/ProductDetail/Panasonic/ECE-A1EN470U?qs=xerK1%2Fx51jhVv%2FMlT1wPmg%3D%3D Mouser]
|[https://www.digikey.com/en/products/detail/panasonic-electronic-components/ECE-A1EN470U/227620 DigiKey] [https://www.mouser.com/ProductDetail/Panasonic/ECE-A1EN470U?qs=xerK1%2Fx51jhVv%2FMlT1wPmg%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Nichicon-UES1C470MPM_C1669286.html LCSC]
|-
|-
|C104, C111, C114, C204, C211, C214, C304, C311, C314
|C104, C111, C114, C204, C211, C214, C304, C311, C314
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|C853
|C853
|1
|1
|ESE105M100AC3EA /  
|ESE105M100AC3EA / 400YXA1MEFC6.3X11
|[https://www.digikey.com/en/products/detail/kemet/ESE105M100AC3EA/13176420 DigiKey] [https://www.mouser.com/ProductDetail/KEMET/ESE105M100AC3EA?qs=9RUIYXQlAdClzKJAOQ1XXg%3D%3D Mouser]
|[https://www.digikey.com/en/products/detail/kemet/ESE105M100AC3EA/13176420 DigiKey] [https://www.mouser.com/ProductDetail/KEMET/ESE105M100AC3EA?qs=9RUIYXQlAdClzKJAOQ1XXg%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-400YXA1MEFC6-3X11_C338206.html LCSC]
|}
|}
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''

Revision as of 15:43, 19 March 2023

This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables
This device is in the WorkNeeded:ReplacementParts category because it was flagged as missing information on replacement parts. If it has the original parts listed you may be able to search for replacements using the parametric searches available from parts distributors. If you have or make a list of replacement parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables
IBM 8512 VGA Monitor
Preliminary Information
Release Year 1987
Leak Risk Medium
Batteries None
Mounting Technology Through Hole
Capacitor Types Aluminum Electrolytic, Tantalum, Ceramic, Polymer
Destructive Entry No
CRT Guides
General Information · Repair Cautions

IBM's first generation VGA display released with the IBM PS/2 computer line.

Known Issues

As a first generation VGA monitor, the 8500 series has its shortcomings. A dot pitch of 0.41 makes the display fuzzy and monitor dims noticeably when drawing light-colored screens, though this is considered a design flaw, not a sign of failing components. There are several known maintenance issues which are detailed in the link to the IBM 8512 page on repairfaq.org (see #Related Links)

Power Supply Failure / Squealing / Clicking

Causes

  • Blown filter capacitors (line or transformer side)

Solutions

  • Replace line filter capacitors in power supply.
  • Replace larger capacitors
  • Consider complete recap.
  • Use low-ESR capacitors at output

Monitor Turns Red

Causes

  • Neck PCB capacitor failure
  • Output / driver transistors on neck PCB (see repairfaq.org link in Related Links)

Solutions

  • Recap Neck PCB
  • Test transistors on neck PCB

Disassembly Notes

When replacing caps located under the EMF shielding, be careful to note capacitor heights for the taller capacitors (C340, C354, C357) if the EMF shielding is to be retained. Experience suggests EMF shields may not be necessary for reliable operation - YMMV.

Original Parts

Main (9979800001) and Neck (9979800002) PCBs

NOTES:

  1. All capacitors listed below are through-hole mounted aluminum electrolytics.
  2. All capacitances are micro Farads (uF).
  3. Capacitors C100 - C400 are located under the EMF shielding (near RGB pots)
  4. Capacitors C400 - C700 are located in the horizontal / vertical control circuitry (middle section of board to flyback)
Main PCB 9979800001 (rev 04 and 08) - Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Diameter/Size Temp Series Notes
C101, C201, C301 3 47 16 BI-POLAR
C104, C111, C114, C204, C211, C214, C304, C311, C314 9 47 16
C106, C206, C306 3 4.7 25 BI-POLAR
C108, C208, C308, C352 4 4.7 50
C113, C213, C313 3 1 50
C115, C215, C315 2 0.47 50
C340, C354, C357 3 470 25
C350 1 100 16
C353 1 100 25
C355, C413, C515, C557, C752 5 10 50 C557 not present on rev 04
C356 1 100 16
C401, C516, C556, C601, C602, C751 6 4.7 50
C405, C414 2 100 25
C408 1 33 16
C412 1 2.2 50
C416 1 330 35
C425 1 100 35
C428 1 470 35
C503, C620 2 1 50 C620 not present on rev 08
C514 1 470 25
C534, C609 2 220 16
C537 1 22 160
C545 1 22 250
C550 1 1000 25
C552 1 220 25
C554 1 33 35
C555, C604 2 47 25
C622 1 33 25
C753 1 1 250
Neck PCB 9979800002 (rev 05 and 07) - Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Diameter / Size Temp Notes
C804, C814, C824 3 1 250
C806, C816, C826 3 2.2 315
C842, C844, C850 3 10 100
C843 1 47 16
C853 1 1 100

Replacement Parts

Main PCB

Note: Capacitors C100-C400 have not been measured to ensure the replacements fit within the EMF shield

Capacitors
RefDes Qty Compatible Part Number Order Links
C101, C201, C301 3 ECE-A1EN470U / UES1C470MPM DigiKey Mouser LCSC
C104, C111, C114, C204, C211, C214, C304, C311, C314 9 860020372004 / 25PK47MEFC5*11 DigiKey Mouser LCSC
C106, C206, C306 3 UVP1V4R7MDD DigiKey Mouser
C108, C208, C308, C352 4 860020672008 / 50PK4R7MEFC5*11 DigiKey Mouser LCSC
C113, C213, C313 3 860020672005 / 50YXJ1M5X11 DigiKey Mouser LCSC
C115, C215, C315 2 860020672004 / 50MH50R47MEFCT54X5 DigiKey Mouser LCSC
C350, C356 2 860010372006 / 25PX100MEFC5X11 DigiKey Mouser LCSC
C353 1 860020473008 / 25PX100MEFC5X11 DigiKey Mouser LCSC
C355, C413, C515, C557, C752 5 860020672010 / 50PK10MEFC5X11 DigiKey Mouser LCSC
C401, C516, C556, C601, C602, C751 6 860020672008 / 50PK4R7MEFC5*11 Digikey Mouser LCSC
C405, C414 2 860020473008 / 25PX100MEFC5X11 DigiKey Mouser LCSC
C408 1 860020372003 / 35YXF33MEFC5X11 DigiKey Mouser LCSC
C412 1 860020672006 / 50YXF2R2MEFC5X11 DigiKey Mouser LCSC
C416 1 860020575013 / 35ZLH330MEFCT810X12.5 DigiKey Mouser LCSC
C425 1 860020573008 / 35PK100MEFC6.3*11 DigiKey Mouser LCSC
C428 1 860020575014 / 35PX470MEFC10X12.5 DigiKey Mouser LCSC
C503, C620 2 860020672005 / 50YXJ1M5X11 DigiKeyMouser LCSC
C514 1 860020474014 / 25PX470MEFC8X11.5 DigiKey Mouser LCSC
C534, C609 2 860020373010 / 16PX220MEFC6.3*11 DigiKey Mouser LCSC
C537 1 UVR2C220MPD / 250BXC22MEFC10X16 DigiKey Mouser LCSC
C545 1 UVY2E220MPD1TD / 250BXC22MEFC10X16 DigiKey Mouser LCSC
C550 1 860020475018 / 25PK1000MEFC10*16 DigiKey Mouser LCSC
C552 1 860020474012 / 25PX220MEFC6.3X11 DigiKey Mouser LCSC
C554 1 860020572005 / 35YXF33MEFC5X11 DigiKey Mouser LCSC
C555, C604 2 860020472006 / 25PK47MEFC5*11 DigiKey Mouser LCSC
C622 1 860020472005 / 35YXF33MEFC5X11 DigiKey Mouser LCSC
C753 1 UVZ2E010MED / ESK105M250AE3AA / 400LLE1MEFC6.3X11 DigiKey Mouser LCSC

Neck PCB

Capacitors
RefDes Qty Compatible Part Number Order Links
C804, C814, C824 3 UVZ2E010MED / ECA-2EHG010 / 400LLE1MEFC6.3X11 Digikey Mouser LCSC
C806, C816, C826 3 860021373003 / 400CGX2R2MEFC6.3X11 DigiKey Mouser LCSC
C842, C844, C850 3 ESH106M100AE3AA / 100YXJ10M5X11 DigiKey Mouser LCSC
C843 1 860020372004 / 6MS747MEFC5X7 DigiKey Mouser LCSC
C853 1 ESE105M100AC3EA / 400YXA1MEFC6.3X11 DigiKey Mouser LCSC

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

Related Links

References

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