Apple imac 21 5 inch late 2009 User Manual
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iMac (21.5-inch, Late 2009) — General Troubleshooting 212010-11-18 Diagnostics Run Apple Service Diagnostic version 3S135 to determine if any thermal sensors or blowers are malfunctioning. If ASD is not available, run Apple Hardware Test version 3A189 by holding down the D key during startup. When a test reports an error, reseat appropriate connections. If issue persists, replace the corresponding part (sensor, blower, logic board, video card, or power supply). See Apple Hardware Error code chart below for correlation between error code, affected sensor, sensor location, and additional checks to perform. AHT Error codeSuspected part and Location Suggested Action Notes 4SNS/1/C0000008: TA0P - xxx Ambient temp sensor damaged or disconnected from logic board. Verify sensor cable is securely connected to the top edge of the logic board and attached to the left speaker housing. Replace sensor cable if damaged. All fans ramp at full speed if sensor is disconnected. 4SNS/1/C0000008: T00p-xxx ODD temp sensor damaged or disconnected from logic board. Verify sensor cable is securely connected to the logic board and the sensor is properly attached to the ODD mechanism. Replace sensor cable if damaged. The ODD fan will run at full speed if sensor is disconnected. 4SNS/1/C0000008: TH00--xxx HDD temp sensor damaged or disconnected from logic board. Use the correct sensor cable, each drive vendor has a unique sensor cable. Verify sensor cable is securely connected to top left side of logic board and is connected to hard drive. Check for damaged cable on logic board. The HD fan may run at full speed if the sensor is disconnected. 4SNS/1/C0000008: TL0p LCD temp sensor on LCD is damaged or disconnected from top of logic board Verify that the LCD sensor cable is securely connected to the logic board and the sensor is attached to the LCD. Replace the sensor cable if damaged The CPU fan will run at full speed if the sensor is disconnected. 4SNS/1/C0000008: TS2P-xxx Skin temp sensor (Quad-core models only) is damaged or disconnected from top of logic board. Verify that the skin temp sensor cable is securely connected to the top of the logic board and sensor is attached to rear housing (near the camera). Replace the sensor cable if damaged.
iMac (21.5-inch, Late 2009) — General Troubleshooting 222010-11-18 AHT Error codeSuspected part and Location Suggested Action Notes 4SNS/1/40000000: TC0H CPU temp sensor (located on back side of logic board). Note: this sensor is not available as a separate service part Check CPU sensor cable connection to logic board. It requires removal of the logic board. If the sensor is disconnected, the CPU fan will run at full speed. 4SNS/1/40000000: TG0H GPU temp sensor (located on back side of logic board) Check GPU sensor cable connection to logic board. It requires removal of the logic board. If sensor is disconnected the CPU fan will run at full speed. 4MOT/4/40000002: ODD-xxx Optical fan/blower Verify that the ODD blower/fan cable is securely connected to the right side of the logic board and that there are no obstructions that would prevent the blower/fan from rotating. Replace fan if the error continues. Normal fan operation, except the ODD blower. 4MOT/4/40000002: HDD-xxx Hard drive fan/blower, located below logic board, near hard drive Verify that the HDD blower/fan cable is securely connected to the top of the logic board and that there are no obstructions that would prevent the blower/ fan from rotating. Replace fan if the error continues. Normal fan operation, except the HDD blower. 4MOT/4/40000002: CPU-xxx CPU fan/blower, located next to left speaker (logic board has to be removed to replace CPU blower) Verify that the CPUblower/ fan cable is securely connected to the left side of the logic board and that there are no obstructions that would prevent the blower/fan from rotating. Replace fan if the error continues. Normal fan operation, except the CPU blower. Note: Make sure black mylar tape along the bottom of LCD panel is not obstructing fan blades, if so, cut tape and re- stick to LCD.
iMac (21.5-inch, Late 2009) — General Troubleshooting 232010-11-18 Diagnostic LEDs Depending on iMac model, there are either three or four built-in diagnostic LEDs on the logic board that can help troubleshoot the computer. LEDs are located on bottom right edge of logic board (under a piece of black mylar tape) and can only be seen when looking through lower vents of rear housing.
iMac (21.5-inch, Late 2009) — General Troubleshooting 242010-11-18 LED Functions LED #1 • Indicates that trickle voltage from power supply has been detected by logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. The LED will remain on even when computer has been shut down or put to sleep. The LED will turn off only if AC power source is disconnected or power supply is faulty. LED #2 • Indicates that logic board has detected power from power supply when computer is turned on. This LED will be ON when computer is turned on and power supply and voltage regulators are working correctly. LED #3 • Indicates that computer and video card are communicating. This LED will be ON when computer is communicating properly with video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then video card might be installed incorrectly or need replacement. Note: LED #3 is not present on models with integrated graphics. LED #4 • Indicates that computer and LCD panel are communicating. This LED will be ON when computer is turned on and video signal is being generated. If LED 4 is ON and there is no image on display, then LCD panel, LED backlight board, or cables between might be installed incorrectly or need replacement.
iMac (21.5-inch, Late 2009) — General Troubleshooting 252010-11-18
LED Startup Sequence
LED #1 = Power available.
If no LED is visible:• Verify AC source
• Verify known-good AC cable is connected
• Verify cable connection between AC inlet and power supply
• Verify cable connection between power supply and logic board
• Verify power supply
LED #1 + LED #2 = Power available, and system is powered on.
If second LED is not visible when power button is pressed: • Verify power button connection to logic board
• Verify power button functionality
• Verify cable connection between power supply and logic board
• Verify power supply
• Verify logic board
LED #1 + LED #2 + LED #3 = Power available, system is powered on, and video card found.
If third LED is not visible after power on: • Verify that MXM video card is seated properly
• Verify logic board
LED #1 + LED #2 + LED #3 + LED #4 = Power available, system is powered on, video card
found, and internal LCD found.
If fourth LED is not visible after power on: • Verify cable connections between LCD panel and logic board
• Inspect LCD display cables for cable damage
• Verify external video functionality, and according to result check the following items:
-If external display works then verify/replace LED backlight board
-If external display works then verify/replace LCD panel
-If external display does not work verify/replace logic board
iMac (21.5-inch, Late 2009) — General Troubleshooting 262010-11-18 Logic Board Test Points Test points, which can be used to verify proper power flow, are accessible on logic board when LCD panel is removed. All voltages given in Troubleshooting Symptom Charts assume that computer is plugged into a known-good power outlet with a known-good AC cable. Some guidelines for using test points: • Warning: HIGH VOLTAGE: Use extreme caution when live testing! • Do NOT lean over or touch the power supply area during live testing. • Keep your fingers behind finger guards on test probes when measuring. • Turn dial of voltmeter/multimeter to measure DC (direct current, usually indicated by a solid horizontal line over dashes). If your voltmeter requires a set voltage range, choose a DC range that includes the voltage you are measuring. • Connect black probe to ground. Connect red probe to test point and verify voltage. For more info, see kBase #HT3250: Diagnostics: Using a digital multimeter Logic Board Test Point Function Pin 1 Ground Pin 4 Standby 12V power (permanent power coming from power supply and present as long as AC cable is connected, even if computer is off ); corresponds to LED #1 Pin 6 Backlight Control pulse width modulated signal (from logic board to LED backlight board, to adjust the backlight level setting according to user setup) Pin 11 12V Run-Mode power to logic board (coming from power supply, present as long as system is on or asleep); corresponds to LED #2 Pin 12 Power On Request signal (from logic board to power supply when power button is pressed) Pin 13 Backlight Enable (signal from logic board to Backlight Controller board, to enable backlight
iMac (21.5-inch, Late 2009) — General Troubleshooting 272010-11-18 Sensor and Fan Connector Locations Ambient temp sensors and fans connectors locations are shown below. Ensure cables are correctly routed and the sensors and fans are properly connected. If a sensor or fan is faulty or not connected, Apple Hardware Test and Apple Service Diagnostic will generate an error code.
iMac (21.5-inch, Late 2009) — General Troubleshooting 282010-11-18 Block Diagram Refer to this diagram to see how modules are interrelated. SO-DIMM Antenna Antenna AntennaSO-DIMM Temperature SensorTemperature Sensor Fan MLB SO-DIMM Display AC/DC Power Button Bluetooth Speakers Hard DriveOptical Drive AC Inlet T emperature SensorCamera Microphone Speakers Backlight Controller Fan Fan MXM 802.1 1n Ambient T emperature Sensor IR Sensor SD Card Reader SO-DIMM
iMac (21.5-inch, Late 2009) Symptom Charts — Startup and Power 29 2010-11-18 Symptom Charts Follow steps in the order indicated below. If an action resolves the issue, retest system to verify. Note: A compilation of Quick Check tables is available at: http://service.info.apple.com/QRS/en/quickreference.pdf Startup and Power No Power, Dead Unit Unlikely cause: speakers Quick Check SymptomsQuick Check No Power, Dead Unit • No power • No fan spin • No startup chime • No image on external display • No hard drive or optical drive activity 1. Verify power source. 2. Verify power cable. 3. Listen closely for signs of activity from system including: rotating fans, hard drive or optical drive activity, startup chime, etc. Deep Dive Check ResultAction Code 1. Power ON system. Verify if there is any indication that the system has powered up (fan rotation, hard drive or optical drive noise, backlight turns on). Yes The symptom is powering up. Go to Won’t Start Up symptom flow. No Go to step 2. 2. Locate diagnostic LEDs in bottom case vents. Plug AC cord into system. Verify if diagnostic LED #1 turns ON. You may alternately check for presence of a 12V DC signal between pin 4 and pin 1 of logic board. Yes Standby power voltage being supplied by power supply. Go to step 3. No Replace power supply.
iMac (21.5-inch, Late 2009) Symptom Charts — Startup and Power 30 2010-11-18 3. Press power button while monitoring diagnostic LEDs. Verify if LED #2 turns ON and remain ON after pressing the power button. You may alternately check for a power request signal between pin 12 and pin 1 of logic board. YesPower supply functioning and logic board detects supply voltages. Go to Won’t Start Up symptom flow. No Go to step 4. 4. Disconnect AC cable then remove power supply and carefully inspect connectors between AC inlet and power supply, then DC connectors and cables between power supply and logic board, for damage or poor connections. Yes Replace damaged part. P16 No Go to step 5. 5. Inspect power button and verify if it is properly connected to the logic board. Yes Go to step 6. No Reconnect power button. 6. Disconnect power button from logic board. Inspect cable and connector for damage. Verify continuity between the two pins of power button when it is pressed. Yes Power button is functioning correctly. Reconnect power button to logic board and go to step 7. No Power button faulty. Replace rear housing (which includes power button). X14 7. Press power button and Verify if system turns ON. You may alternately check for presence of a 12V DC signal between pin 11 and pin 1 of logic board when power button is pressed. Yes Power supply functioning. If system still won’t boot, go to Won’t Start Up symptom flow. No Replace DC power cable. Go to step 8. X03 8. Press power button and verify if system turns ON. Yes Issue solved with replaced DC power cable. No Replace power supply. Go to step 9. P01 9. Press power button and verify if system turns ON. Yes Issue solved with replaced power supply. No Reinstall power supply and replace logic board. M01 Note: If No Power symptom persists after all steps have been followed use minimum configuration troubleshooting to proceed. Try disconnecting hard drive, optical drive, AirPort, Bluetooth, and SD card modules to determine if one of them is preventing the power supply from functioning.