You might check for updates. Or try reset to factory then either stop or limit updates if possible. This sounds like a software glitch. It is also possible that an update didnt load properly but still worked until this issue.
SOURCE: 52 RCA DLP 1080P Television with NO picture and buttons flash
IF you would like help diagnosing your set. Go to the enclosed link. They have the service manual for your set and offer unlimited chat support for only 29.99. Just click on your sets manufacturer and you will see your model. Then click on the contact us link and provide your email address and they will email your manual and instructions on how to obtain your support. I am one of their techs. This manual contains step by step procedure for troubleshooting Your RCA DLP Light Engine
http://servicemanuals.vstore.ca/
SOURCE: Sony Bravia KDL52XBR5 picture blanks out using HDMI port
I think this has to do with the cable box not liking the encryption thing going on with the sony tv. The cable boxes probably don't understand it fully and therefore you have intermittant problems. I would just use component inputs. Which are analog and no encryption problems. I hope this was helpful. I bet it doesn't happen using a sony DVD Player or a blue ray DVD Player either. Sony, Sony, Sony.....Good stuff...but they have their moments. Let me know if u come up with a fix for this and then i will post it on my fix it list.. Thank you again..GURU JAY
SOURCE: JVC LT-32DS75SJ issue with HDMI
Try this
1. Turn ON TV
2. Connect PS3 to TV HDMI input
3. select TV HDMI input for PS3
4. turn OFF PS3 if it is ON
5. Press and hold the [I/O]Power button until the PS3 until you get the "HDMI Detected" message.
Also, this TV has a circuit that deactivates the HDMI if the rear cover is removed. It is possible the HDMI may have been turned OFF. This is reset in the service menu of the TV.
SOURCE: Westinghouse LTV-20V4 turning on PROBLEM
I had this problem with these tv`s. As mentioned the problem lies with the
power supply inside the unit. Some of the units i`ve seen have 2 blown
capacitors on the power supply (C7 and C6 which are 0.227microFarad) replacing these works. On
others, the capacitors as well as a few transistors
(Q8 - Q1, HSD965) are
blown. But on all the sets i have seen with this problem, changing the
above components restores full functionality to the system.
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.
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