IBM 8512 VGA Monitor, 12": Difference between revisions
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==Disassembly Notes== | ==Disassembly Notes== | ||
When replacing caps located under the EMF shielding, be careful to note capacitor heights for the taller capacitors. | 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. | ||
==Original Parts== | ==Original Parts== | ||
===Basic PCB Name=== | ===Basic PCB Name=== | ||
Main PCB: 9979800001 rev. 04 and 08 | |||
Neck Board: 9979800002 rev 05 and 07 | |||
Power Supply: | |||
''NOTE: All capacitors listed below are through hole mounted aluminum electrolytics. All capacitances are micro Farads (uF).'' | ''NOTE: All capacitors listed below are through hole mounted aluminum electrolytics. All capacitances are micro Farads (uF).'' | ||
Revision as of 14:36, 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 | 
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| 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 not generally a sign of failing components. There are several known maintenance issues which are detailed in the link.
Symptom or Problem Encountered
Causes
- Failed power supply, monitor would intermittently turn pink.
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
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.
Original Parts
Basic PCB Name
Main PCB: 9979800001 rev. 04 and 08
Neck Board: 9979800002 rev 05 and 07
Power Supply:
NOTE: All capacitors listed below are through hole mounted aluminum electrolytics. All capacitances are micro Farads (uF).
| RefDes | Qty | Capacitance | Voltage | Diameter/Size | Temp | Brand | Series |
|---|---|---|---|---|---|---|---|
| C115, C215, C315 | 2 | 0.47 | 50 | ||||
| C113, C213, C313, C503, C620* | 5 | 1 | 50 | ||||
| C853 | 1 | 1 | 100 | ||||
| C753, C804, C814, C824 | 4 | 1 | 250 | ||||
| C412 | 1 | 2.2 | 50 | ||||
| C806, C816, C826 | 3 | 2.2 | 315 | ||||
| C106, C206, C306 | 3 | 4.7 | 25 | ||||
| C108, C208, C308, C352, C401,
C516, C556, C601, C602, C751 |
10 | 4.7 | 50 | ||||
* C620 is not present on rev. 08
** C557 is notpresent on rev. 04
Replacement Parts
Basic PCB Name
| 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
- Digikey BOM: https://www.digikey.com/