I had this happen and know what you are talking about. The tech guy talked me over the phone on how to fix it. He said the problem was a hang up issue, like the hdmi ports actually hang up the line like a phone call. He had me turn off the auto detect settings that talk to the other components and share info with each other. Then he had me reset the TV. It was a while ago so I may have reset the TV first then turned off the auto detect settings. Play around with it and I bet you will get it figured out.
SOURCE: How do I hook up the HDMI cables to a cable box
how do i hook up hdmi cables to cable Sony KDL Bravia LCD HDTV
SOURCE: sony kdl-40s2000
I have had an extremely similar problem with my Comcast Motorola DVR and Sony Bravia with HDMI connection. For months I would lose picture/keep sound when changing from a non-HD to an HD channel. The solution that I found is that there is a setting in the cable box setup that will likely fix your issue. Turn off your cable box leaving the TV on. Quickly press the Menu button on your remote to get into the Box setup. Make sure that 4:3 Override is set to "Off" instead of 480i. I believe this will solve your problem.
SOURCE: Westinghouse 1080P 42" LCD TV - HDMI stopped working
Just reset the TV found out how here: http://www.danielcoburn.com/uncategorized/westinghouse-1080p-42-lcd-tv-hdmi-stopped-working-fix/
Hold the power button for 10 seconds.
SOURCE: hdmi port stopped working on sony bravia
I have a Sony Bravia model KDL-46s5100 that had the same problem. All HDMI ports stopped working. I don't know why this works but unplug the TV for about 30 sec, then plug it back in and hold down the power button on the tv for 10 seconds. Like I said I don't know why this works but it worked for me. Good luck.
T-CON: E40951307-TCON Troubleshooting 10-22-09_OPT
http://www.scribd.com/doc/25276757/E40951307-TCON-Troubleshooting-10-22-09-OPT
http://www.mediafire.com/?zzjygannjty PDF download
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
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