REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday 19 March 2019

ACER ASPIRE 4920 - EXTERNAL CD/DVD ROM DRIVE CHECK - KEYBOARD-MEMORY HOW TO TROUBLESHOOT - AND MORE

HOW TO TROUBLESHOOT ACER ASPIRE 4920- EXTERNAL CD/DVD ROM DRIVE CHECK - KEYBOARD-MEMORY - And more


TROUBLESHOOTING
  1. The diagnostic tests are intended to test only Acer products. Non-Acer products, prototype cards, or modified options can give false errors and invalid system responses.
  2. Obtain the failing symptoms in as much detail as possible.
  3. Verify the symptoms by attempting to recreate the failure by running the diagnostic tests or repeating the same operation.
  4. Do not use any power sources when performing an assembly or disassembly procedures.
  5. If any problems occur, you can perform the following visual inspection before you continue.
  •  Power cords are properly connected and secured.
  • There are no obvious shorts or opens.
  • There are no burned or heated components.
  • All components appear normal.
EXTERNAL CD/DVD ROM DRIVE CHECK
Perform the following procedures to isolate the possible problem a controller, drive, or CD-ROM.
NOTE: Make sure that the CD-ROM does not have any label attached to it. The label may damage the drive or cause drive failure.
  • Boot from the diagnostic disc and start the diagnostic programs.
  • See if CD-ROM Test is passed when the program runs the CD-ROM Test.
  • Follow on-screen instructions.
If an error occurs, reconnect the drive to the connector on the mainboard. If the error persists, do the following:
  1. Reconnect the CD/DVD-ROM drive.
  2. Replace the CD/DVD-ROM drive.
  3. Replace the main board.
KEYBOARD/AUX INPUT DEVICE CHECK
Remove the external keyboard if the internal keyboard is to be tested.
If the internal keyboard does not work or an unexpected error occurs, make sure that the flexible cable extending from the internal keyboard is correctly connected to the main board. If the keyboard cable connection is correct, run the Keyboard Test.
If the tests detect a keyboard problem, do the following procedures in sequence to correct the problems. Do not replace a non-defective FRU:
  • Reconnect the keyboard cable.
  • Replace the keyboard.
  • Replace the main board.
The following auxiliary input devices are supported by this computer:
  1. Numeric keypad
  2. External keyboard
If any of these devices do not function, reconnect the cable and repeat above procedures.
MEMORY CHECK
Make sure that the DIMM is properly installed into the connector. A loose connection can cause an error.
Do the following:
  • Boot from the diagnostic diskette and start the diagnostic program.
  • Go to the diagnostic memory in the test items.
  • Press F2 in the test items.
  • Follow on-screen instructions.
POWER SYSTEM CHECK
  • Remove the battery pack.
  • Connect the power adapter and check the power supply.
  • Disconnect the power adapter and install the battery pack; then check that power supply.
If you suspect a power problem, see the appropriate power supply check in the following list:
“Check the Power Adapter”
“Check the Battery Pack”
POWER ADAPTER CHECK
  • Unplug the power adapter cable from the system and measure the output voltage at the plug of the power adapter cable.
  • If the voltage is not correct, replace the power adapter.
  • If the voltage is within range, do the following:
  1. Replace the System board.
  2. If the problem is not resolved, see “Undetermined Problems”
  3. If the voltage is not correct, go to the next step. NOTE: An audible noise from the power adapter does not always indicate a defect.
  4. If the power-on indicator does not light up, check if the adapter’s power cord is properly connected to the system.
  5. If the operational charge does not work, see “Check the Battery Pack”.
CHECK THE BATTERY PACK

Using the software to identify whether a problem occurs while the battery pack during recharge or discharge:
Open Power Management in the Control Panel.
In Power Meter, confirm if the parameters for Current Power Source and Total Battery Power Remaining are correct.
Repeat the steps 1 and 2 for both battery and adapter.
Using the hardware to identify whether you should replace the battery pack or not:
  1. Power off the system.
  2. Remove the battery pack and measure the voltage between terminals one (+) and seven (-). There are seven terminals totally.  
  3. If the voltage is still less than 7.5 Vdc after recharging, replace the battery.  If the battery status indicator does not light up, remove the battery pack. If the charge indicator still does not light up, replace the AC/DC charger board.
TOUCH-PAD CHECK
If the touch pad doesn’t work, do the following procedures in sequence to correct the problem. Do not replace a non-defective FRU:
  • After rebooting, run Tracking Pad PS2 Mode Driver. For example Syn touch driver.
  • Run utility with the PS/2 mouse function and check if the mouse is working.
  • If the PS/2 mouse does not work, then click if the main board to switch board FPC is connected properly.
  • If the main board to switch board FPC is connected correctly, then check if the FFC on the touch pad PCB is connected properly.
  • If the FFC on the touch pad PCB is connected correctly, check if LS851 JP1 Pin6 = 5V.
  • If yes, then replace switch board. If not, then go to the next step.
  • Replace the touch pad PCB.
  • If the touch pad still does not work, then replace the FPC on Track Pad PCB.After you use the touch pad, the pointer drifts on the screen for a short time. This self-acting pointer movement will occur when a slight, steady pressure is applied to the touch pad pointer. This symptom is not a hardware problem. No actions are necessary to be taken if the pointer movement stops in a short period of time.
POWER ON SELF TEST [POST]
The POST error message index lists the error message and their possible causes.
NOTE: Perform the FRU replacement or actions in the sequence shown in FRU/Action column, if the FRU replacement does not solve the problem, put the original part back in the computer. Do not replace a non-defective FRU.
The error messages are listed in the coming pages to indicate the BIOS signals on the screen and the error symptoms classified by functions. If the symptom is not included on the list, please refer to “Undetermined Problems”.
NOTE: Most of the error messages occur during POST. Some of them display information about a hardware device, e.g., the amount of memory installed. Others may indicate a problem with a device, such as the way it has been configured.
NOTE: If the system fails after you make changes in the BIOS Set-up Utility menus, reset the computer, enter Set-up and install Set-up defaults or correct the error.
Posted By: FRANK at 01:57
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