IBM 8512 VGA Monitor, 12"

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	DigiKey Mouser
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	DigiKey Mouser
C401, C516, C556, C601, C602, C751	6	860020672008	Digikey Mouser
C405, C414	2	860020473008	DigiKey Mouser
C408	1	860020372003	DigiKey Mouser
C412	1	860020672006	DigiKey Mouser
C416	1	860020575013	DigiKey Mouser
C425	1	860020573008	DigiKey Mouser
C428	1	860020575014	DigiKey Mouser
C503, C620	2	860020672005	DigiKeyMouser
C514	1	860020474014	DigiKey Mouser
C534, C609	2	860020373010	DigiKey Mouser
C537	1	UVR2C220MPD	DigiKey Mouser
C545	1	UVY2E220MPD1TD / 250BXC22MEFC10X16	DigiKey Mouser
C550	1	860020475018	DigiKey Mouser
C552	1	860020474012	DigiKey Mouser
C554	1	860020572005	DigiKey Mouser
C555, C604	2	860020472006	DigiKey Mouser
C622	1	860020472005	DigiKey Mouser
C753	1	UVZ2E010MED / ESK105M250AE3AA	DigiKey Mouser

Neck PCB

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
C804, C814, C824	3	UVZ2E010MED / ECA-2EHG010	Digikey Mouser
C806, C816, C826	3	860021373003	DigiKey Mouser
C842, C844, C850	3	ESH106M100AE3AA	DigiKey Mouser
C843	1	860020372004	DigiKey Mouser
C853	1	ESE105M100AC3EA	DigiKey Mouser

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

• Digikey BOM: https://www.digikey.com/

Related Links

• IBM 8512, 8513, and 8514 maintenance and repair notes on repairfaq.org