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LG 47LS4500 Bad Diode.

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Published on Aug 7, 2014

http://www.tvrepairinfo.com/
This TV was brought in my shop with no back light or sound. It turned out to be a simple repair. Diode D607 had become leaky. A resistance test showed it had 4.7 ohms in both directions. Since most of the bad Diodes I've encountered had shorts with less than One ohm of resistance, I almost failed to detect there was a problem. I mistakenly assumed the 4.7 ohms resistance I measured was due to other components in parallel with my Diode. Fortunately I removed the diode to test it again and it turned out to be bad.
The location of this Diode is D607. The original part number was MUR460AG. I replaced it with an MUR460G which was purchased through digikey. It's a 4 amp ultrafast switching diode with 600 PRV and 75 NS. I have been made aware that the MUR460 with different letters at the end indicate if it's a fast switching diode or an ultrafast switching diode. I figure ultrafast is the best choice.
This TV was made by LG. Model number of this TV is 47LS4500
For those I don't know I have a website at http://www.tvrepairinfo.com/ where there is a directory to all my free videos case histories.

One of my viewers named Wane said the diode has been updated so as to handle more heat. Here is his post.
D607 . In the power board revision 3.0 it was upgraded to a TO-220 type diode to better handle the heat.
STTH10LCD06 600V 10A TO-220FP
https://en.wikipedia.org/wiki/TO-220

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