This is a service manual for IBM E50 LG CB553H MENU SELECT CHASSIS NO.: CA-120. It contains information about the monitor's picture tube, signal, power supply, display area, environment, and dimensions.
This service manual provides detailed information for repairing and maintaining the IBM E50 LG CB553H color monitor. It includes specifications, safety precautions, wiring diagrams, block diagrams, adjustment procedures, troubleshooting guides, exploded views, and a replacement parts list.
Technicians can use the included schematics, timing charts, and OSD adjustment instructions to diagnose faults, measure high‑voltage levels safely, and replace critical components such as the picture tube or high‑voltage circuitry.
| Picture Tube Size | 15 inch (Flat Square Tube) |
|---|---|
| Deflection Angle | 90° |
| Dot Pitch | 0.28 mm |
| Input Voltage Level (Sync) | Low=0~1.2V, High=2.5~5.5V |
| Video Input Impedance | 75 Ω |
| Power Supply AC Range | AC 100~240V, 50/60Hz |
| Power Consumption (Normal) | < 75 W |
| Display Resolution | 1024 x 768 @ 60Hz |
| Active Video Area | 285 x 215 mm |
| Net Weight | 11.5 kg |
An isolation transformer must be inserted between the monitor and the AC power line, and a plastic screwdriver should be used to avoid shock hazards.
The normal high voltage is about 24.5 kV.
Use the specified picture tube, keep the high voltage at the factory‑recommended level, and measure it with a calibrated high‑impedance meter.