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Troubleshooting and Repairing Electronics problem can be fun but when you come across this kind of Integrated Circuit (IC) that does not have any part number written or printed on it could make you frustrated. You just do not know what type of IC is it and the function of it unless you got the schematic diagram. The picture shown above have blank marking and not like others that have the part number removed and left out some blur marking on it (some use sand paper to purposely remove it). I have seen many UPS that the part number have been removed. The purpose of using ICs that do not have the marking, i believe is to prevent the design from being copied by another competitor and also not encouraging other technician to repair it. Your choice would be send the equipment back to the distributor or get a new set.
By the way we have to thanks to the manufacturers who did not remove the part number in most of the consumer electronic equipment otherwise as an electronic repairer we will have a hard time figuring it out the part number and its function. The photo above was taken from a remote control.
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Steve Hearns
January 27, 2009 at 2:34 am
Yes, there is a higher rate of seeing this problem than in the past. On remote controls its not as big of a problem, because usually cost of new is very low....and a substitute remote control may be possible. Its a bigger problem when used deeper inside the actual chassis of the product. As repair becomes lower percentage of choice to buying new, this kind of trend may increase. We need to do more to as technicians to encourage growth of repair services.
Noel
October 1, 2011 at 10:17 am
Yes,I faced this problem mostly in circuit board that is manufactured in China.Specially in industrial circuit board that I am working,lots of IC's are no part number.
admin
October 3, 2011 at 2:23 am
Hi noel,
Yes some board purposely remove those part number.
Jestine