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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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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 !

Thursday, 21 March 2019

APPLE MACBOOK-PRO - HOW TO REMOVE AND REPLACE KEYBOARD

HOW TO REMOVE AND REPLACE KEYBOARD TO APPLE MacBook PRO


TOOLS
  • 0 Phillips screwdriver (magnetized)
  • Black stick (nylon probe 922-5065) (or other non-conductive nylon or plastic flat-blade tool.
  • The MacBook Pro keyboards are not interchangeable with previous models. Verify that the correct replacement keyboard is ordered, and/or top case if replacing.
  • The keyboard comes as a multi-layered assembly, and includes backlighting. Do not disassemble the keyboard assembly. Dust, fingerprints, or misalignment, can cause improper function and damage.
  • On a clean flat surface, turn the top case upside down.
  • Locate the protective cover over flex cable connectors.
  • Carefully slide a black stick around the perimeter of the cover to release the adhesive.
  • Lift off the cover and set aside for reassembly. 
  • Important: Keep the cover and any residual adhesive on the top case clean.
  • Rotate the top case and locate the two keyboard flex connectors shown below. Remove any Kapton tape, then very carefully lift the latches of the connectors to release the cables.
  • Important: The connectors are delicate. If damaged, the top case must be replaced.
  • Note the positioning, then carefully peel off the insulator film covering the back of the keyboard well. Reserve the film and keep it clean for re-installation.
  • Important: Use care at notches and narrow parts to avoid ripping the film.
  • Important: Do not remove the rubber pads if not replacing the top case. If replacing the top case, transfer these to the same locations.
  • Use needle nose pliers to straighten the four bend-tabs located along the bottom edge, as shown. These tabs lock down and stiffen the top edge of the keyboard. Important: The bend-tabs are delicate. Bend them carefully to avoid damage. Avoid over-bending.
  • Remove the ten keyboard screws.
  • Note the six insert-tabs along the middle edge, and two on each side. The following procedures release these tabs so that the keyboard can be removed.
  • To prevent the keyboard from falling out, support it with your hand, and raise the top case up vertically.
  • Note: The keyboard does not have adhesive under it, as in previous models.
  • If needed, push through one of the top center keyboard screw holes, with the point of a black stick, to bow out the keyboard slightly.
  • Important: Ensure that the hole used is a screw hole, or damage to other sensitive components may result. A black stick is used to avoid damaging the screw boss threads do not use a metal tool.
  • Important: During this procedure, do not allow the tabs or metal edge of the keyboard to scrape along the cosmetic surface of the top case, or damage can result
  • Use your finger to hold the bowed out keyboard. Continue to bow it out only enough for the tabs on one side of the keyboard to release cleanly. Repeat for the other side.
  • Important: Do not bow the keyboard too much, or it may become permanently bent.
  • Lift the keyboard up to release the tabs along the bottom edge and carefully thread out the flex cables.
REPLACEMENT
When replacing the keyboard, here are some key points to ensure:
  • Prevention of scratches to the cosmetics of the top case
  • All tabs are properly seated
  • Keyboard lays flat
  • Cables not caught
  • Bend-tabs are not damaged
  • Screw holes align
  • Cable connectors are not damaged and cables are secure
  • Kapton tape is applied as before
  • Insulator film is correctly installed
  • Before replacing or installing a replacement keyboard, verify that the four bend-tabs along the bottom edge of the keyboard are straight and parallel with the bottom edge (two are shown close-up, below).
  • Important: Do not bend any other bend-tabs on the keyboard other than the four along the bottom. Other tabs hold the keyboard assembly together.
  • Guide the keyboard’s flex cables through the slot in the top case, as shown. Make sure that they do not catch or bend behind the keyboard.
  • Verify that the small cable routes through the slot, as shown.
  • Lower the keyboard and seat all six tabs along the bottom, so that the keyboard sits flat and straight.
  • Important: During the next steps, do not allow the tabs or metal edge of the keyboard to scrape along the cosmetic surface of the top case, or damage can result.
  • While ensuring that the keyboard bottom stays straight and secure, hold the top of the keyboard in the middle, then with your other hand, bow in one side of the keyboard to engage the two tabs at the top into the top case.
  • Important: Do not bow the keyboard too much, or it may become permanently bent.
  • Use the heel of your hand to hold in place the edge of the keyboard that was just inserted while holding the top of the keyboard with a finger on that hand, then use your other hand to help bow in the remaining side of the keyboard until it can be engaged.

  • While supporting the keyboard in the top case, verify that the keyboard lays flat and that all  the tabs have seated properly.
  • Note: The keyboard will not sit flat if any of the tabs have not seated properly. If the side tabs are not seating or are binding, check the bottom edge of the keyboard to verify that all the tabs are seated and the bottom of the keyboard is straight.
  • Verify that the bend-tabs are not caught.
  • Lay the top case flat, and upside down.
  • Pull on the flex cables to verify that they are not bent or caught under the keyboard, and that they extend to their connectors.
  • Verify that the screw holes align with the screw bosses and install all ten keyboard screws, starting from the middle and work out.
  • Bend the four bend-tabs over the metal of the bottom case to secure the bottom edge of the keyboard.
  • Important: The bend-tabs are delicate. Bend them carefully to avoid damage and no more than 90-degrees, or to, or within, any etch marks, if present. Avoid over bending.
  • Insert the two flex cables into their connectors and secure. Verify that the cables are fully inserted and secured straight. Kapton tape will be applied to the small connector, later.
  • Re-install the protective cover over the area shown. Line up the edges carefully with the residual adhesive, then carefully burnish down the edges to secure. (top case shown rotated)
  • Replace the insulator film in the same locations as they were removed. Ensure the holes in the film match up correctly with the screw bosses. Avoid wrinkles and bulges. If installing a replacement top case, use the new film if supplied.
  • Important: The film must be installed and in the same location to protect against contact and electrical shorting in certain areas and to allow contact with the EMI spring on the logic board.
  • Install Kapton tape to secure the small flex cable connector.
  • Verify that the rubber pads (mentioned earlier) are installed in the correct locations.
  • If the film extends over the edge of the keyboard well, run your finger along the edges to secure it to the top case.
  • Note: Picture for illustration only. The insulator film may be different.
  • Reassemble the computer.
  • Testing the computer should include powering on, checking the keyboard and track pad  function.
  • Operate the computer in a darkened room to check for keyboard back-light function, and light leakage around the perimeter of the keyboard, speaker grill openings and side ports.
Posted By: FRANK at 02:30
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