How to remove Dallas RTC from motherboard
Discussion
I’ve got an old PC that I want to fire up again.
When I tested it it failed to boot and I’ve tracked it down to the Dallas RTC chip.
These chips have an inbuilt battery in the package and have to be replaced or hacked to add an external battery.
I looked at the tutorials on the internet but didn’t pay close enough attention so now I’ve Dremelled too much of the contacts away!! I need to remove and replace the chip without damaging the motherboard.
I can’t easily access the pins to clip the legs and desolder one by one- Is there a better way to do this.
I’ve been looking at inexpensive <£100 solder stations with reflow guns.
I’ll replace with a socket
Is anyone able to advise please-
Thanks
A bull in a China shop
When I tested it it failed to boot and I’ve tracked it down to the Dallas RTC chip.
These chips have an inbuilt battery in the package and have to be replaced or hacked to add an external battery.
I looked at the tutorials on the internet but didn’t pay close enough attention so now I’ve Dremelled too much of the contacts away!! I need to remove and replace the chip without damaging the motherboard.
I can’t easily access the pins to clip the legs and desolder one by one- Is there a better way to do this.
I’ve been looking at inexpensive <£100 solder stations with reflow guns.
I’ll replace with a socket
Is anyone able to advise please-
Thanks
A bull in a China shop
You really need a hot-air solder station, and a pair of tweezers that are naturally closed.
Set the temperature of the solder station to around 200C. Heat the area around the chip, and then increase the temperature to 250C. Grab the chip with the tweezers, and gently take as much weight of the board as you can with the tweezers.
The chip should lift when the solder has melted. You might need to go a little hotter, but don't left the heat soak into one spot (move it around the area).
I've pulled (and reused) chips many times, but I've also got a preheater (something like https://www.ebay.co.uk/p/895315677?iid=17401352643... ) if I'm really worried about saving the board and/or the chip. But an extravagance for a one-off.
Set the temperature of the solder station to around 200C. Heat the area around the chip, and then increase the temperature to 250C. Grab the chip with the tweezers, and gently take as much weight of the board as you can with the tweezers.
The chip should lift when the solder has melted. You might need to go a little hotter, but don't left the heat soak into one spot (move it around the area).
I've pulled (and reused) chips many times, but I've also got a preheater (something like https://www.ebay.co.uk/p/895315677?iid=17401352643... ) if I'm really worried about saving the board and/or the chip. But an extravagance for a one-off.
I have removed lots of Dual PS/2 Keyboard/Mouse and Stacked USB Sockets from Motherboards with a domestic Heat Gun with no attachments. 100s of them.
Not recommended if there are any Surface Mount Components between or close to the Legs of the Chip.
For certain Motherboards I would cover nearby Components with Sheet Metal. Have seen Tin Foil used.
Leather Glove. Heat a bit, see if it moves, heat a bit more. Tinning the Legs first or applying flux may help.
Not recommended if there are any Surface Mount Components between or close to the Legs of the Chip.
For certain Motherboards I would cover nearby Components with Sheet Metal. Have seen Tin Foil used.
Leather Glove. Heat a bit, see if it moves, heat a bit more. Tinning the Legs first or applying flux may help.
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