Re: Repairing PSU FSP271-4F01



This is what's above the fuse holder:
T5.0AH/250V...

Re: Repairing PSU FSP271-4F01


Do you know if this p/s uses a slow blow fuse? My brother swapped out the fuse with a fast blow so I don't know the original fuse type....

Re: Repairing PSU FSP271-4F01

selldoor, That is a great analogy, I currently don't have my camera, so I couldn't take a picture. I only posted the OP pic so that you could see the location of the mosfets. I will post pictures of my actual p/s once I get my camera back.

I tested Q2 for shorts with a DVM to make sure it was not shorted I did not pull it or test the operation. With Q3, Q4 and QS6 removed the fuse does not blow. I did remove the bridge rectifier and it tested good, then put it back before powering it up.

Since I know know the part number...

Re: Repairing PSU FSP271-4F01

selldoor, thanks for the reply. Unfortunately I don't have the TV set with me, my brother removed the power supply and asked me to take a look at it to see if I could fix it. The fuse on the power supply blows immediately, even if not connected to the TV. I used to be a bench tech back in the 80s repairing complicated 300 plus chip count telecommunication circuit boards to component level. I can remove and solder these basic electronic components of this type of power supplies.

The TV is the same as the OP, Olevia LT42HVI 42" LCD...

Re: Repairing PSU FSP271-4F01

Not trying to hi-jack here. I've been following this thread and found that Q3 & Q4 are shorted causing the fuse to blow. These parts are on order.

I also found that QS6 is also shorted but I can not read the part number on it as it has glue on it from an insulator on the center leg. I see OP listed it part number SUP85N15, but mine definitely doesn't have a part number that long.

The part number I can see on QS6 is N435AB and under that is FDPxxxx (where xxxx I can't make out due to the glue that's on it). I tried...