Hi,
My 40" Samsung TV (bought in 2011 or 2012) for the last couple of weeks would power on fine in the morning, but then would reboot a few minutes later. Within 10 to 15 minutes, it may reboot 2-3 times. After these reboots, the TV was fine for the rest of the day. Recently, it started to get worse with it taking longer to come out of the reboot, and rebooting 6 or 7 times every morning or whenever you powered it off for an extended time and powered it back on.
I decided to take it apart to look for swollen capacitors, too much dust, etc. I didn't find any build up of dust nor any swollen capacitors. I tried to test the large 100uf capacitor shown in the photo (1) but inadvertently shorted the 2 legs causing a large spark. TV however still powered on ok after that so no damage. With the power on (I forgot), I ended up accidentally shorting the + of the capacitor to the MOSFET heatsink (2) causing another large spark, and taking a small chunk from the heatsink. This time the TV did not power on and the 6.3A slow blow fuse (3) blew. I replaced the fuse with a 4 AMP normal fuse and was able to get the TV to power up again. I did finally correctly test the large capacitor when the fuse was blown and it showed about 91 uF.
Not finding anything wrong, I re-assembled the TV, and put it back in service, and the rebooting issue hasn't occurred since for the last 3 days!
How is this possible? Did the short take out a defective but unnecessary component?
My 40" Samsung TV (bought in 2011 or 2012) for the last couple of weeks would power on fine in the morning, but then would reboot a few minutes later. Within 10 to 15 minutes, it may reboot 2-3 times. After these reboots, the TV was fine for the rest of the day. Recently, it started to get worse with it taking longer to come out of the reboot, and rebooting 6 or 7 times every morning or whenever you powered it off for an extended time and powered it back on.
I decided to take it apart to look for swollen capacitors, too much dust, etc. I didn't find any build up of dust nor any swollen capacitors. I tried to test the large 100uf capacitor shown in the photo (1) but inadvertently shorted the 2 legs causing a large spark. TV however still powered on ok after that so no damage. With the power on (I forgot), I ended up accidentally shorting the + of the capacitor to the MOSFET heatsink (2) causing another large spark, and taking a small chunk from the heatsink. This time the TV did not power on and the 6.3A slow blow fuse (3) blew. I replaced the fuse with a 4 AMP normal fuse and was able to get the TV to power up again. I did finally correctly test the large capacitor when the fuse was blown and it showed about 91 uF.
Not finding anything wrong, I re-assembled the TV, and put it back in service, and the rebooting issue hasn't occurred since for the last 3 days!
How is this possible? Did the short take out a defective but unnecessary component?
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