Macintosh Portable Power Supply CR-76U

[campbellashe]

Working on various parts of my Macintosh Portable as I await RAM to replace on my board.....
This is the M5136 (CR-76U) from my non back lit version.

Is this salvageable? Should I just Dremel the lower part off and re-tin it....

 

[PL212]

I recap'ed my Portable power supply that was in similar/worse condition... one tip is to (carefully!) do an output voltage test before you re-glue the case together, in case any adjustment is needed. Be careful of course as the line voltage is right there and lethal until the case is re-sealed.

 

[campbellashe]

What was your approach to the carnage?

 

[campbellashe]

Well removing the Sony transformer I lost some legs -- they were pretty brittle. Anyone have a similar issue and fix it?

 

[campbellashe]

Well. I just placed some small wires to extend the areas broken. The transformer fit fine with some careful guidance. Power supply is fully functional. This is the repair -- not pretty but functional. I didn't end up using the Dremel, just checked continuity and fixed some areas where the board had been eaten away and cracked. All components replaced and new caps. Then checked the output at 7.5 V before I used it.... charging my Mac portable battery just fine.

Here is a picture of the "repaired" board.

 

[campbellashe]

This is a screenshot of TechKnight's board that is Dremeled and clean that I used to check continuity....

 

[Froggy814]

FYI, I used a usb-c power board and a buck converter and combined them to make a replacement power supply run fully off usb-c.

These are the parts I used.

https://www.amazon.com/D-FLIFE-Trigger-Charger-Support-Optical/dp/B0CPDRY45Q/ref=sr_1_4?sr=8-4

and

https://www.amazon.com/DROK-Adjustable-Converter-Transformer-Protective/dp/B07JZ2GQJF/ref=sr_1_8?sr=8-8

 

[campbellashe]

Did you stick it back in the Original Power Supply Brick?

 

[Froggy814]

No, I was to afraid to open the original brick (because of the glue and snapping it). But I can take measurements for you. I've also almost completed the 3d model/print for it.

EDIT: It looks like it would fit with room to spare.

 

[campbellashe]

The case survived my screw driver prying method from the entry point of the cable. I used some small shims to get it open. Nothing cracked but I just worked it slowly. There is one screw at the bottom holding the board down once you are inside the case, it was rusted well as it is right where the capacitor carnage occurred.

Here is the picture of my reassembled brick.... not too bad but for some scratches....

 

[Froggy814]

Thanks for the confidence. I might just pry it open now that I know it won't look too bad after prying it open.