IBM 8512 VGA Monitor, 12": Difference between revisions

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==Known Issues==
==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 not generally a sign of failing components.  There are several known maintenance issues which are detailed in the link.
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 below.


===Symptom or Problem Encountered===
===Power Supply Failure / Squealing / Clicking===
====Causes====
====Causes====
*Failed power supply, monitor would intermittently turn pink.
*Blown filter capacitors (line or transformer side)
====Solutions====
====Solutions====
*Replace capacitors throughout power supply, main PCB, and neck board.  Inspect carbon film resistors in area of flyback transformer for burn marks / shell damage
*Replace line filter capacitors in power supply.
*Replace larger capacitors
*Consider complete recap.
*Use low-ESR capacitors at output
 
=== Monitor Turns Red ===
 
==== Causes ====
 
* Possible Neck PCB capacitor failure
 
==== Solutions ====
 
* Recap Neck PCB
* Possibly recap color gun circuitry under EMF shielding on main PCB


==Disassembly Notes==
==Disassembly Notes==
When replacing caps located under the EMF shielding, be careful to note capacitor heights for the taller capacitors if the EMF shielding is to be retained.  Experience suggests EMF shields may not be necessary for reliable operation - YMMV.  
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==
==Original Parts==
===Basic PCB Name===
===Main (9979800001) and Neck (9979800002) PCBs===
Main PCB: 9979800001 rev. 04 and 08
''NOTES:'' 


Neck Board: 9979800002 rev 05 and 07
#All capacitors listed below are through-hole mounted aluminum electrolytics.
 
#All capacitances are micro Farads (uF).
Power Supply:
#Capacitors C100 - C400 are located under the EMF shielding (near RGB pots)
 
#Capacitors C400 - C700 are located in the horizontal / vertical control circuitry (middle section of board to flyback)
''NOTE:  All capacitors listed below are through hole mounted aluminum electrolytics. All capacitances are micro Farads (uF).''


{| class="wikitable sortable"
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
|+Main PCB 9979800001 (rev 04 and 08) - Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
!RefDes
!RefDes
!Qty
!Qty  
!Capacitance
!Capacitance
!Voltage
!Voltage
!Diameter/Size
!Diameter/Size
!Temp
!Temp
!Brand
!Series
!Series
!Notes
|-
|-
|C115, C215, C315
|C115, C215, C315
Line 55: Line 68:
|
|
|-
|-
|C113, C213, C313, C503, C620*
|C113, C213, C313
|5
|3
|1
|1
|50
|50
Line 64: Line 77:
|
|
|-
|-
|C853
|C106, C206, C306
|3
|4.7
|25
|
|
|
|BI-POLAR
|-
|C108, C208, C308, C352
|4
|4.7
|50
|
|
|
|
|-
|C101, C201, C301
|3
|47
|16
|
|
|
|BI-POLAR
|-
|C104, C111, C114, C204, C211, C214, C304, C311, C314
|9
|47
|16
|
|
|
|
|-
|C350
|1
|1
|100
|16
|
|
|
|
|-
|C356
|1
|1
|100
|100
|16
|
|
|
|
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|
|
|-
|-
|C753, C804, C814, C824
|C353
|4
|1
|1
|250
|100
|25
|
|
|
|
|-
|C340, C354, C357
| 3
| 470
| 25
|
|
|
|
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|
|
|-
|-
|C412
|C503, C620
|2
|1
|1
|2.2
|50
|50
|
|
|
|
|
|
|
|C620 not present on rev 08
|-
|-
|C806, C816, C826
|C753
|3
|1
|2.2
|1
|315
|250
|
|
|
|
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|
|
|-
|-
|C106, C206, C306
|C412
|3
|1
|4.7
| 2.2
|25
|50
|
|
|
|
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|
|
|-
|-
|C108, C208, C308, C352, C401,  
|C401, C516, C556, C601, C602, C751
C516, C556, C601, C602, C751


|10
|6
|4.7
|4.7
|50
|50
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|
|
|-
|-
|C355, C413, C515, C557, C752
|5
|10
|50
|
|
|
|
|
|
|
|C557 not present on rev 04
|-
|C537
|1
|22
|160
|
|
|
|
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|
|
|-
|-
|C545
|1
|22
|250
|
|
|
|
|
|
|
|
|-
|C408
|1
|33
|16
|
|
|
|
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|
|
|-
|-
|C622
|1
|33
|25
|
|
|
|
|
|
|
|
|-
|C554
|1
|33
|35
|
|
|
|
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|
|
|-
|-
|C555, C604
|2
|47
|25
|
|
|
|
|
|
|
|
|-
|C405, C414
|2
|100
|25
|
|
|
|
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|
|
|-
|-
|C425
|1
|100
|35
|
|
|
|
|
|
|
|
|-
|C534, C609
|2
|220
|16
|
|
|
|
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|
|
|-
|-
|C552
|1
|220
|25
|
|
|
|
|
|
|
|
|-
|C416
|1
|330
|35
|
|
|
|
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|
|
|-
|-
|C514
|1
|470
|25
|
|
|
|
|
|
|
|
|-
|C428
|1
|470
|35
|
|
|
|
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|
|
|-
|-
|C550
|1
|1000
|25
|
|
|
|
|
|
|
|
|}
{| class="wikitable sortable"
|+Neck PCB 9979800002 (rev 05 and 07) - Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
!RefDes
!Qty
!Capacitance
!Voltage
!Diameter / Size
!Temp
!Notes
|-
|C853
|1
|1
|100
|
|
|
|
|-
|C804, C814, C824
|3
|1
|250
|
|
|
|
|
|
|-
|-
|C806, C816, C826
|3
|2.2
|315
|
|
|
|
|
|-
|C842, C844, C850
|3
|10
|100
|
|
|
|
|
|
|-
|C843
|1
|47
|16
|
|
|
|
|
|
|}
|}
<nowiki>*</nowiki> C620 is not present on rev. 08
<nowiki>**</nowiki> C557 is notpresent on rev. 04


==Replacement Parts==
==Replacement Parts==

Revision as of 15:46, 9 February 2022

For general information, see more on Wikipedia: Device
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 below.

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

  • Possible Neck PCB capacitor failure

Solutions

  • Recap Neck PCB
  • Possibly recap color gun circuitry under EMF shielding on main 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
C115, C215, C315 2 0.47 50
C113, C213, C313 3 1 50
C106, C206, C306 3 4.7 25 BI-POLAR
C108, C208, C308, C352 4 4.7 50
C101, C201, C301 3 47 16 BI-POLAR
C104, C111, C114, C204, C211, C214, C304, C311, C314 9 47 16
C350 1 100 16
C356 1 100 16
C353 1 100 25
C340, C354, C357 3 470 25
C503, C620 2 1 50 C620 not present on rev 08
C753 1 1 250
C412 1 2.2 50
C401, C516, C556, C601, C602, C751 6 4.7 50
C355, C413, C515, C557, C752 5 10 50 C557 not present on rev 04
C537 1 22 160
C545 1 22 250
C408 1 33 16
C622 1 33 25
C554 1 33 35
C555, C604 2 47 25
C405, C414 2 100 25
C425 1 100 35
C534, C609 2 220 16
C552 1 220 25
C416 1 330 35
C514 1 470 25
C428 1 470 35
C550 1 1000 25
Neck PCB 9979800002 (rev 05 and 07) - Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Diameter / Size Temp Notes
C853 1 1 100
C804, C814, C824 3 1 250
C806, C816, C826 3 2.2 315
C842, C844, C850 3 10 100
C843 1 47 16

Replacement Parts

Basic PCB Name

Capacitors
RefDes Qty Compatible Part Number Order Links
Digikey

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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