Hello. My name is Sean and my neighbors home was recently struck by lighting. It came in via the phone line and pretty much took out everything on his LAN. The TV was connected to a u-verse box and so i suspect the lighting came in through a video connection. I have an electronics back ground so i offered to look at the unit. It is currently dead with zero signs of life. No power indicator at all. I removed the back cover and did the standard visual inspection for damage. To my surprise there appears to be not one bit of visual damage. I checked all the diodes, caps, ICs, transistors, etc visually on the power supply. I also looked over the main board too. I electronically checked some of the componets using a ohm meter. Including checking the fuse. Looking for obvious shorts on transistors, etc. I took some voltage reading on the primary side and everything appears normal all the way to the mosfets, etc however the low voltage side is completely dead. There is no 5, 12, 13.2, etc vdc at all. The unit was off when the strike hit. I suspect the strike did its damage to at least the 5vdc standby curcuit preventing any chance of the PSU from turning on.
I downloaded the Sharp service manual but of course they omitted the PSU schematic as its made by delta. So i could use some guidence on where to look for the components that supply the 5vdc. I also have posted images of the board here. Thanks in advance for any assistance.
I downloaded the Sharp service manual but of course they omitted the PSU schematic as its made by delta. So i could use some guidence on where to look for the components that supply the 5vdc. I also have posted images of the board here. Thanks in advance for any assistance.
Attached Files
Comment