Data recovery and disk repair questions and discussions related to old-fashioned SATA, SAS, SCSI, IDE, MFM hard drives - any type of storage device that has moving parts
May 19th, 2022, 6:30
Yes there seems to be a symbol at bottom left. I think that symbol was at the bottom left on the card when i done it.
May 19th, 2022, 18:45
Do you know where the white dot is on my card? Can't find it.
May 20th, 2022, 7:27
I tried 3 different U12 with 2 different ways. No motor notice. Can i have burned the cards? No burning is visible.
May 20th, 2022, 8:29
Maybe it isn't good to use a big heat gun so heat comes over the U12?
May 21st, 2022, 3:44
Oldschool297 wrote:I tried 3 different U12 with 2 different ways. No motor notice. Can i have burned the cards? No burning is visible.
Only the original ROM will work (or a chip with the original data) they are not interchangeable between pcb's. It's pretty clear you're struggling with both the technical and equipment side perhaps you should leave this to someone else. If you haven't already mixed up the ROM's there's a good chance you've killed it with the paint stripper.
May 21st, 2022, 4:29
The pcb has same numbers so it should be possible to change U12. Maybe i destroyd the U12. Only had heat for 10 sec max.
May 21st, 2022, 4:43
Oldschool297 wrote:The pcb has same numbers so it should be possible to change U12.
Like I said, perhaps this is best left to someone else.
May 21st, 2022, 20:56
Yes you got a point. But i will try myself. If i get a smaller more suited heat gun. How many W? Do it need to be on? The so called paint stripper was on 1600w. I used the second level of 3. I guess you should not point the heat gun over the U12? I guess the heat should only be on the feets to U12?
May 22nd, 2022, 8:09
I would suggest that you buy some low-melt solder and use that to unsolder the ROM with a soldering iron. Much less chance of destruction. Clean up the solder from the ROM legs before transferring it to the new PCB.
May 23rd, 2022, 6:17
I guess the U12 chip is sensitive for heat and you easily can burn it? You should only try to keep the heat at the legs?
May 23rd, 2022, 7:50
Oldschool297 wrote:I guess the U12 chip is sensitive for heat and you easily can burn it? You should only try to keep the heat at the legs?
I believe so, although I haven't destroyed one yet. However, I exercise great care not to overheat the ROM, sometimes using a hot plate to gradually bring the PCB to 215C or so before using hot air to unsolder the ROM, focusing it on the legs/PCB. Be sure to note the location of pin 1 on the ROM and PCB, so you attach it with the correct orientation on the donor PCB.
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