I wanted to share a warning to people who are thinking of just swapping fuses on their boards before a repair.
I just had a customer who followed some guide from Samsung which eventually said to put in another fuse.
So he installed a 25A labeled fuse, but a non-brand name one from China.
I got the board in for repair yesterday, as obviously the fuse didn't fix anything. After an hour+ of investigation the board is not repairable
due to the extent of the damage from the fuse which didn't open successfully on time.
Here are pictures of such a fuse and how messed up the fuse area alone gets (attached).
Weld marks, expansion, deformation cracks. Elsewhere on the board welding was going on comparable to a 300A inverter welder.
The fuse used not only was too large for a test at 25A , but also a fake non functioning knockoff. Had the customer used a 10A brand name fuse for a power on test, the board would have been repairable.
If you do want to try a fuse, please use no more than a 10A BRAND NAME fuse that is listed in Canada/USA
A 10A fuse is good for a test as it will even let you power on a burner or two on medium settings (5) before it blows, but if it does blow (which it will), it won't damage anything much more. A 25A fuse on the other hand is NO PLACE TO SAVE MONEY
, at least buy a brand name one if you are stubborn and think you need one that large for a test. You risk fire and injury with no name large amperage fuses.
(it's like saving money on a defibrillator, seat belt or airbag)