Hello all! I have just started picking up broken televisions and trying to repair them as a hobby. I picked up a 40" Emerson LC401EM3F on Craigslist and have started troubleshooting it, but I am not sure what my next steps should be.
I was having power supply issues when I first started looking at it. The television would power on for about 2 seconds (with backlight) and then go immediately back to standby mode. For some strange reason, yesterday this problem disappeared and I was able to get the backlight to stay lit. Additionally, I plugged in a source into the HDMI port and the sound was working! However, there is still no video available. When I first picked up the television, I purchased a used but functional digital main board (TCON - A17PHUH). I attempted to swap out the digital main board and there was no effect on the video. The same problem exists (backlight on - sound works, but no video).
I have the service manual and have been looking through it, but I am lost as to how to troubleshoot at this point. Are there specific points on the TCON board that I can check to ensure it is getting power?
The service manual can be found at this link .
Thanks in advance.
I was having power supply issues when I first started looking at it. The television would power on for about 2 seconds (with backlight) and then go immediately back to standby mode. For some strange reason, yesterday this problem disappeared and I was able to get the backlight to stay lit. Additionally, I plugged in a source into the HDMI port and the sound was working! However, there is still no video available. When I first picked up the television, I purchased a used but functional digital main board (TCON - A17PHUH). I attempted to swap out the digital main board and there was no effect on the video. The same problem exists (backlight on - sound works, but no video).
I have the service manual and have been looking through it, but I am lost as to how to troubleshoot at this point. Are there specific points on the TCON board that I can check to ensure it is getting power?
The service manual can be found at this link .
Thanks in advance.
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