I have a 4 year old Samsung HLR6167WAX/XAA DLP television and it has been having a problem with the HDMI port for quite a while now. When I connect my laptop to the HDMI port of the TV and try switching the source of the TV to HDMI, it cannot find the HDMI source and the only sources it finds are the over the air antenna and the PC source that is connected to the VGA port. I know that the HDMI port on my laptop and the HDMI cable I am using are good because I verified them with a different TV/cable and both of them work properly.
I know that the lamp is very old/past its expiry date. With the over the antenna, the picture shows up good most of the time but shows green rectangles after an hour of use. With the VGA port as a source, there are no such issues with the picture quality though. So what could be the problem here? Could it be the lamp, Digital board or the DMD board? If it is a faulty component within the boards I can do component replacement; I have good soldering skills and have access to a solder reflow oven and basic test equipment like DMMs and scopes. Trying to go through the Service Manual to find out what component blew out is too much work, especially when you don't know what to look for. So if anyone has any solution or know what might be the problem, please reply to this post.