how to replace a ba chip

ratuslabus · 02-12-2003,10:54 AM

which is the most effective way of removing and replacing the ba chip?

are special tools required?

PS2Meister · 02-12-2003,12:50 PM

Hello

I have just replaced a BA5815FM chip. I cut thru the pins using a sharp stanley blade as near as I could to the top of the chip and in towards it. Coming in from the top you have a risk of cutting thru tracks underneath the pins. You are left with the two main heat sink pins, using a hack saw I cut thru these blowing away any metal filings away from the board to avoid shorts on the board. Trying to de-solder these two main pins was too much hassle. Remove the chip and de-solder all the remains of the pins left behind on the board. Clean all the pads up by dabbing the soldering iron on to each one to level them out so correct seating of the new chip may be obtained.

I tinned all the pins on the BA chip then soldered the two main heatsink pins first to ensure correct seating for the rest of the pins. When soldering each pin, lightly press on the pin and it will touch the pad on the board and solder itself to it. Make sure no solder bridges across any of the pins.

Thats it's basically, re-check all pins don't join using a multimeter to make doubly sure, some of the pins are meant to connect though, I think its pins 11 and 12, 13 and 14, 15 and 16, 17 and 18...can anybody confirm???

PS2Meister

charlie_ps2 · 02-12-2003,02:48 PM

http://www.rohm.com/products/databoo...f/ba5815fm.pdf

This link has a pin map of the BA58. I don't think your reading of the bridged points is right. I would expect the two centre pins to be grounded as also the real pin 8; the two VCC pins are at the same voltage (12v) and if they come from the same source may appear bridged.

PS2Meister · 02-12-2003,03:47 PM

Hello Charlie_PS2

My previous post was before I had put my PS2 together after the install of the BA5815FM chip and those pins that I mentioned being bridged I wasn't sure of, anyway I took a gamble and switched on the PS2 and the tray ejects and discs are loading as they should be, so it seems the pins that were bridged were correct after all.

Thanks for everybody's help in getting life back into my PS2, cheers guys!

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