valutazioni - 4, GPA: 3.5 ( )

Produttore : Philips File Size : 6.56 mb File Nome : Lingua di insegnamento:

2. System Board 3. Power sources No beep, power-on indicator on, and a blank LCD during POST. 1. System Board No beep, power-on indicator on, and a blinking cursor only during POST. 1. System Board No beep during POST but system runs correctly. 1. Turn the volume up and check the speaker. 2. Speaker 3. System Board LCD-Related Symptoms Important The LCD for the notebook computer contains over 921 000 thin-film transistors (TFTs). A small number of missing, discolored, or lighted dots (on all the time) is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of dots satisfies the following condition: . The number of missing, discolored, or lighted dots in any background is 21 or more. Symptom / Error FRU / Action in Sequence No beep, power-on indicator on, and a blank LCD during POST. 1. System Board . LCD backlight not working, or . LCD too dark, or . LCD brightness cannot be adjusted, or . LCD contrast cannot be adjusted. 1. Reseat the LCD connectors. 2. LCD Assembly . LCD screen unreadable, or . Characters missing pels, or . Screen abnormal, or . Wrong color displayed. 1. See important note for “LCD-Related Symptoms.” 2. Reseat all LCD connectors. 3. LCD Assembly 4. System Board 286 IBM Mobile Systems - ThinkPad HMM Volume 3 Symptom / Error FRU / Action in Sequence LCD has extra horizontal or vertical lines displayed. LCD Assembly Keyboard/TrackPoint III-Related Symptoms Symptom / Error FRU / Action in Sequence Keyboard (one or more keys) does not work. 1. Reseat the keyboard cable on the system board. 2. Keyboard 3. System Board TrackPoint III does not work. 1. Reseat the keyboard cable on the system board. 2. Go to “TrackPoint III Checkout” on page 271. 3. Keyboard 4. System Board Pointer moves automatically or does not work correctly. 1. See “TrackPoint III Checkout” on page 271. Indicator-Related Symptoms Symptom / Error FRU / Action in Sequence Indicator incorrectly remains off or on, but system runs correctly. 1. System Board Battery power status indicator blinks from green, yellow, to orange. 1. Check that a correct battery is installed. 2. Battery Pack 3. System Board Power-Related Symptoms Symptom / Error FRU / Action in Sequence Power shuts down during operation. 1. Go to “Power Systems Checkout” on page 272. 2. Battery Pack 3. Remove the battery pack and let it cool for two hours. 4. Power sources The system will not power-off. (See “Power Shutdown Switch” on page 267.) 1. Press the power shutdown switch. 2. System Board ThinkPad 560 (2640) 287 Function-Related Symptoms Symptom / Error FRU / Action in Sequence The system will not suspend or resume by opening or closing the LCD. 1. Go to “Suspend Mode” on page 276, and check that the computer can enter suspend mode. 2. Boot an operating system and press Fn+F4. If the computer enters suspend mode, suspect that the application program is not working properly. 3. LCD Assembly 4. System Board Battery Fuel-Gauge does Go to “Checking the not go higher than 90%. Battery Pack” on page 274 and see the note. Memory count (size) appears different from actual size. Go to “Memory Checkout” on page 269. System configuration does not match the installed devices. Go to “Checking the Installed Devices List” on page 293. System hangs intermittently. Go to “Intermittent Problems” on page 289. Peripheral-Device-Related Symptoms Symptom / Error FRU / Action in Sequence External display does not work correctly. 1. See “External Display Self-Test” in “Common Devices Checkout” section. Printer problems. 1. Run Printer Self-test. 2. Parallel Port Device 3. Cable 4. System Board Serial or parallel port device problems. 1. Device 2. Device Cable 3. System Board 288 IBM Mobile Systems - ThinkPad HMM Volume 3 Infrared-Related Symptoms Symptom / Error FRU / Action in Sequence Unable to communicate using the Infrared (IR) Port. 1. Make sure the setup for the IR is correct. 2. Make sure there are no fluorescent lights near the computer. The computer may receive optical noise from the fluorescent light. 3. Run the advanced diagnostic test. If an error occurs and a FRU code is displayed, replace the parts shown by the FRU code. Other Symptoms Symptom / Error FRU / Action in Sequence Errors occur only when Port Replicator is used. See “Port Replicator Checkout” on page 275. PCMCIA slot pin is damaged. PCMCIA Slots Assembly Note If you cannot find a symptom or error in this list and the problem remains, see “Undetermined Problems” on page 290. Intermittent Problems Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement should only be considered when a recurring problem exists. When analyzing the intermittent problem, do the following: 1. Run the advanced diagnostic test for the system board in loop mode at least 10 times. 2. If no error is detected, ...

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