iSight G5 Apple Mother Board 820-1766-A

Pictured below are the capacitor locations and values for Apple iMac G5 iSight Mother Board 820-1766-A motherboards.



For high quality, low ESR, computer and switching power supply grade, long life, high temperature rated, and high current rated capacitors, go to www.jwestsales.com, your source for the Apple in you.

Note that there are at least two different iSight G5 models with different logic cards. Take a look at this one to confirm which model iSight you have.

Click the following link to purchase the iSight Mother Board Capacitors Kit.

Here is a down-loadable procedure for G5 iSight dis-assembly which can take you all the way down to and including the iSight motherboard removal.

Regards,

Jim Warholic

Labels: iMac, iSight, MOB

posted by Jim Warholic @ 2/04/2010 04:17:00 PM

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Apple iMac G5 iSight Logic Board 820-1783-A

Pictured below are the capacitor locations and values for Apple iMac G5 iSight Logic Card 820-1783-A motherboards.

For high quality, low ESR, computer and switching power supply grade, long life, high temperature rated, and high current rated capacitors, go to www.jwestsales.com, your source for the Apple in you.
Click the following link to purchase the iSight Logic Board Capacitors Kit.

Here is a down-loadable procedure for G5 iSight dis-assembly which can take you all the way down to and including the iSight motherboard removal.

Regards,
Jim Warholic

Jim Warholic is President of Professional Web Services, Inc., an Internet marketing services company dedicated to helping B2B and B2C companies gain a larger online footprint through Internet marketing, SEO, online advertising, web branding, and strategic marketing to help companies increase their sales and improve their bottom line results. Prior to starting Professional Web Services, Jim has had a lifetime of experience and engineering expertise in the electronics field in circuit board drilling, routing, and electronics equipment maintenance and field service engineer repair services.

Labels: iSight, MOB

posted by Jim Warholic @ 12/30/2009 11:11:00 PM

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iMac G5 iSight Intel Core 2 Duo Disassembly

How do you disassemble the Apple iMac G5 iSight Intel Duo Core Mac?

I first removed the memory modules by unscrewing the bottom access panel.

The Plexiglas on the front is held on by a magnetic strip around the lip.

I used a piece of clear tape to grab it and gently pulled it away. A small suction cup works also.

From there you can get to the screws that hold the outside bezel in place.

From there, you can lift off the front bezel (disconnecting the camera cable at the top) and gain access to the display bracket screws on each side.

Once you take those out, then the display will lift out of the chassis. Just keep track of the four sets of cables that plug in the back side of the display and there is one main MOB display connector cable with a clip.

Here is a video that shows a few of those items:

Note there were more connectors on the bottom of the display on the Aluminum iMac G5 that I had an opportunity to work on. I noted which connecters went where before disconnecting them.

Below are pictures of the Apple iMac G5 iSight Intel Core 2 Duo model.

Pictured above is the inside of the iMac G5 Intel Core 2 Duo. Note the power supply in the upper left corner, followed by the hard drive in the upper middle, and the DVD/CD Super Drive on the right side. Located directly below the hard drive is the mother board (main logic card) with the main heatsink screwed directly to the mother board (MOB). To the right and left of the MOB are the fans. To the the right and left side of the fans are the built-in small speakers.

Pictured above are the onboard status lights (LEDs) located on the main logic card. These LEDs can also been seen in the first picture of the Apple iMac G5 Intel with the bezel removed. However, I don’t believe these status lights match up to the older iMac G5 PPC onboard status lights. Citation required.

Here is some additional information on some of the Apple iSight G5 models.

Below is a video of an earlier generation iMac G5 iSight model. I believe this video is of an interim iMac G5 model.

 

 

Note the memory is located in the bottom of the iMac. Access is by removing a small screw in the access panel. I also suggest you remove the memory first.

Article by: Jim Warholic

Jim is President of Professional Web Services, Inc., an Internet marketing services company specializing in both the B2B and B2C market place. If you would like to find out more information about getting your business more sales and qualified leads online, contact Professional Web Services today.

Labels: iMac, Intel_iMac

posted by Jim Warholic @ 11/19/2009 04:40:00 PM

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Apple iMac G5 Take Apart Procedure 1st and 2nd Generation

Here is the procedure that I used to replace the capacitors on the Apple iMac G5 MOB.

When you take it apart, start with this order:

1. Lay the iMac face down on a soft, protected surface.
   
2. Back cover removal. (Loosen the three screws on the bottom lower edge, then lift up carefully from the bottom up).
3. Take close up pictures of your G5 mother board and inside the iMac for your reference in case you need to refer to something for proper installation.
   
4. Power supply removal ( http://manuals.info.apple.com/en/imacg5_17inch_Power_Supply.pdf ).
5. Verify Power Supply capacitors are not bulging or blown out.
   
6. Hard drive removal.
7. CD removal.
8. Memory cards removal.
9. Right fan cover removal.
10. Lower left plugs undo.
11. Fan plugs - disconnect.
    
12. Airport option removal, being careful not to break the very delicate antenna wire clip. You might want to leave the wire attached and just move the Airport out of the way.
    
13. Then remove the torx mounting screws. See the special 12-in-1 screwdriver with Torx and Phillips bits.
14. Carefully lift out the MOB, making sure all the mounting screws were removed. Do not force it.
15. Heat up the soldering iron, with a wide tip attached, and working from the bottom and the top of the MOB, with the MOB tilted up on edge, heat up one leg of a capacitor on the backside and rock the capacitor slightly from the top. Then do the other leg, and the cap will come out of the hole.
16. Remove all capacitors in the groups.
17. Once the holes are clear, (pins work well), then place the high quality low ESR capacitors in the holes, making sure the positive and negative legs of the capacitors are properly situated in the holes. Do not install caps backwards. Major damage will most likely result.
18. Apply Arctic Silver thermal paste heat sink compound to the small area (make sure it is cleaned with isopropyl alcohol), on the bottom of CPU. Cover it and the matching heat sink area with a thin layer (not to excess). Use a small razor blade as a scraper to remove the excess. Keep it thin, thin, and thin.
    
19. Reassemble the motherboard, (don't forget the white light tube that displays the "power on" light on the front cover of the iMac), hard drive, DVD/CD Super drive, cables, plugs, fan covers, memory modules, and make sure you don't have any extra screws left over.
20. Double check and triple check your work.
21. Place the back cover on.
22. Plug everything back in and turn it on.

Important Notes:

• Don't forget to put new heatsink compound back on the bottom of the processor chip, which is located on the bottom of the MOB, and the solid plate heatsink assembly located on the chassis: Arctic Silver. Several heating up and cooling down cycles is required for maximum thermal heatsinking effectiveness.
  
• At least a 60 watt soldering iron is recommended and a good solder sucker and some plastic headed sewing pins for heating up and push removing solder from holes. Read the article: Soldering Tips for Lead-Free Solder for more detailed information.
  
• Use rosin core solder only. Do not use acid core or acid flux. Use lead free, or, in my opinion even standard 60/40 leaded solder will work (although there are few lead-free caveats) for soldering the new caps. Just make sure there are no cold solder joints.
  
• How to Tip: Use a few small pins to clear the holes when the soldering iron is used to heat up the holes to remove the old solder.
• Don't try to bypass this advice. Highly recommend replacing all the caps in both groups. Even though one or two caps might be visibly bad, the others are more than likely weak or on their way out too.
• It's up to you if you want to attempt the repair. It depends on how comfortable you feel about doing it yourself. The degree of difficulty on MOB caps replacement on a scale of 1 to 10, with 1 being the easiest and 10 being the hardest; a 7.
  
• Double check your power supply unit. Open the PSU to check those capacitors too.
• Degree of difficulty on PSU caps replacement on a scale of 1 to 10; a 3.
  

The procedure above is going off of memory.

Suggestions:

• Layout your screws as you go.
• Have lots of room to lay it out.

Refer to my articles, read carefully, and suggest printing them out for reference.

iMac G5 Motherboard repairs procedure
iMac G5 power supply repairs

Feel free to contact me if you have any further questions.

Jim

Labels: iMac, MOB, PSU

posted by Jim Warholic @ 8/18/2009 08:05:00 AM

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Apple iMac G5 Power Supplies Capacitors

Apple iMac G5 Power Supply

Pictured above is an example of an iMac G5 power supply; yours might be different, and might not have the ambient light sensor shown above, which is attached to the bottom of some of the PSUs.

Below are three pictures of the various iMac G5 power supplies, with the internal printed circuit board exposed, after the metal covers have been removed. Read more about the do-it-yourself Apple iMac G5 power supply repairs and the Apple iMac G5 mother board repairs.

Information updated 09/17/09. I have everything in stock for the iMac G5 power supplies "A", "B", "C", “DD”, and “EE” style PSUs. Purchase the iMac G5 power supplies cap kits from the buy now links. These Apple iMac Power Supply P/Ns are specified with my specific “P/N” lettering system, not the official Apple Part Numbers.

The iMac G5 power supplies are listed below with a detailed picture of each PSU and the replacement values. Because of the large number of different iMac G5 Power Supplies, please compare your iMac power supply visually with the images below. There are differences on the capacitor values and quantities required for each of the PSUs listed below.

Power Supply “A”

Apple iMac G5 Power Supply 20 Inch “A” Style

11 Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 3300uf the longest life at 10,000 hrs. rating. Upgrade notice: Because of the difficulty in obtaining 10mm X 30mm 3300uf 10 Volts rated capacitors, I have upgraded this to the 12.5mm X 20mm 10 Volts rated capacitor. These 3300uf capacitors will fit into the space on the PSUs, but will stand above the circuit board slightly because of other components in the way at the base of the larger diameter capacitor. Note, the original 3300uf capacitors in my opinion were standing too high and shorting out on the top of the metal power supply cover as can be seen in the original trouble shooting section of the Apple iMac G5 Power Supply repair article. Note also, that some of the capacitors have been upgraded in voltage ratings. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

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Power Supply “B”

Apple iMac G5 Power Supply 17 Inch “B” Style

9 Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 4700uf and the (1000uf 12.5mm 20mm 35 volt capacitor) are the longest life at 10,000 hrs. rating. Upgrade notice: Because of the difficulty in obtaining 10mm X 30mm 4700uf 6.3 Volts rated capacitors, I have upgraded the 4700uf to the 12.5mm X 25mm size 6.3 Volts rated capacitor. These 4700uf capacitors will fit into the space on the PSUs, but will stand above the circuit board slightly because of other components in the way at the base of the larger diameter capacitor. Note, the original 4700uf capacitors in my opinion were standing too high and shorting out on the top of the metal power supply cover as can be seen in the original trouble shooting section of the Apple iMac G5 Power Supply repair article I wrote. Note also, that some of the capacitors have been upgraded in voltage ratings. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

I include a replacement chart showing the original value capacitor and the replacement value capacitor with your PSU cap order. Please refer to this chart when installing the new caps.

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Power Supply “C”

Apple iMac G5 Power Supply 20 Inch “C” Style

11 Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 3300uf and the (1000uf 12.5mm 20mm 35 volt capacitor) are the longest life at 10,000 hrs. rating. Upgrade notice: Because of the difficulty in obtaining 10mm X 30mm 3300uf 10 Volts rated capacitors, I have upgraded this to the 12.5mm X 20mm 10 Volts rated capacitor. These 3300uf capacitors will fit into the space on the PSUs, but will stand above the circuit board slightly because of other components in the way at the base of the larger diameter capacitor. Note, the original 3300uf capacitors in my opinion were standing too high and shorting out on the top of the metal power supply cover as can be seen in the original trouble shooting section of the Apple iMac G5 Power Supply repair article. Note also, that some of the capacitors have been upgraded in voltage ratings. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

I include a replacement chart showing the original value capacitor and the replacement value capacitor with your PSU cap order. Please refer to this chart when installing the new caps.

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Power Supply “DD”

Apple iMac G5 Power Supply “DD” Style

9 Total Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 1000uf 12.5mm 20mm 35 volt capacitor is the longest life at 10,000 hrs. rating. Upgrade notice: I have upgraded some of the capacitors to higher voltage ratings. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

I include a replacement chart showing the original value capacitor and the replacement value capacitor with your PSU cap order. Please refer to this chart when installing the new caps.

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Power Supply “EE”

Apple iMac G5 Power Supply “EE” Style

9 Total Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings.

Upgrade notice: Because of the difficulty in obtaining 10mm X 30mm 4700uf 6.3 Volts rated capacitors, I have upgraded the 4700uf to the 12.5mm X 25mm size 6.3 Volts rated capacitor. These 4700uf capacitors will fit into the space on the PSUs, but will stand above the circuit board slightly because of other components in the way at the base of the larger diameter capacitor.

** Note the replacement value of the different voltage rating 1000uF caps (three 6.3 V and one 10 V) to a total of four 1000uF 16 volt caps. These 1000uF caps are slightly taller but will clear the top cover of the PSU.

Also note the original 4700uf capacitors, in my opinion, were standing too high and shorting out on the top of the metal power supply cover as can be seen in the original trouble shooting section of the Apple iMac G5 Power Supply repair article I wrote. Note also, that some of the capacitors have been upgraded in voltage ratings as I have said before. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

I include a replacement chart showing the original value capacitor and the replacement value capacitor with your PSU cap order. Please refer to this chart when installing the new caps.

Order Your Proper iMac G5 Power Supply Capacitors Kit

Match up your power supply with the power supply above. Double check your capacitors against the capacitor lists above before placing your order at my eCommerce Out West Store. If you don’t see your power supply displayed here, I suggest you contact me first before placing the order. All orders and secure payments are processed with Secure Google Checkout and allowing you to use any major credit card of your choice for purchases.

When installing the new capacitors, the positive lead is the longer lead, and the negative lead is the shorter lead. The capacitors have a long wide line printed on the side, that matches up to the negative lead on the capacitor. This must be properly aligned with the proper holes on the power supply printed circuit board. Make sure the capacitors are installed properly. The circuit board is typically marked with a circle of where the capacitors mount, and the positive or negative terminal is also indicated on the PCB. *Warning: If you install the capacitors in backwards, they will become damaged or explode when the unit is turned on. Making this mistake, can also damage other components in your iMac. So, pay attention, and be careful. If you are not sure, take a picture of your own power supply before you start working on it, so you can reference the old ones with the new ones.

I suggest you replace one capacitor at a time, so you do not mix up which one goes where. Another warning. Don’t make this mistake of installing them in the wrong location, because the power supply will not function properly.

In addition, be aware that there are surface mount components on the bottom of the PCB. Be careful when soldering. A standard 60/40 or lead free rosin core solder may be used. Do not use acid core or acid flux with your solder. Damage to the circuit board will result if you use the wrong solder core type.

Please be aware that not all the power supplies can be repaired with just the capacitors being replaced. Sometimes a power supply blows something else besides the capacitors. Diodes, rectifiers, transistors, resistors, and surface mount components can go bad because of the iMac G5 capacitor failures. I will say this though, there is a high degree of success in replacing the caps on the Power Supply Units. The caps on the PSUs are actually easier to unsolder and solder on the printed circuit board as compared to the MOB caps.

Labels: iMac, PSU

posted by Jim Warholic @ 4/02/2009 08:39:00 PM

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Please Send in Your Apple iMac G5 Pictures

Please send in your pictures for posting on the website. I plan on using this area for documenting various aspects of the Apple iMac G5 Computers.

There is a ton of Apple iMac G5 information regarding troubleshooting and repairing iMac motherboards and power supplies. With the different variations of iMac G5 PowerPC and Intel based computers manufactured by Apple, it is important to try and document as much of the information as possible for the MAC Users.

Since Apple is reluctant (understandably so) to provide detailed schematics of their products to be used for trouble shooting purposes, it will be even more important as time goes on to provide the helpful tips, insights, modifications, and repair reports at the forefront for all the MAC User Groups and Apple users around the world.

When you send in your pictures of the inside and outside of your Apple iMac, please provide the model number and serial number of the particular iMac in question. This will be helpful in providing historical data for trouble shooting purposes.

Please use the direct "James" email link below to send your pictures.

Thank you.

Best regards,

Jim

Labels: Introduction

posted by Jim Warholic @ 3/26/2009 11:57:00 PM

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