Question about Sharp Aquos LC-45GD4U 45 in. LCD HDTV

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1080p ** Longer Available, problems switching to 1080i.

Sorry the story is a bit long. About a year ago I **ticed that my Motorola cable box (1080i) which was plugged into the DVI port on the TV wouldn't work. The TV would show the picture for about 4 seconds and then tell me "** signal detected". I played around with power, input selection, etc and eventually it would work again. Strange thing is that my Xbox 360 was able to output 1080p fine at the time though old style component connectors. Eventually about 4 months ago the DVI completely failed with the cable box - ** way to get it to work. I thought it was the cable box and switched to component for it and everything worked and I forgot about it. About 3 months ago my Xbox failed to work at 1080p and **w only functions at 1080i. At the same time I have problems switching from 720p (or less) up to 1080i using the Motorola cable box (but from 1080i to 720p works without a problem). I have to select a blank input and then back to the Motorola input before it will show the picture properly (otherwise it looks like it's a copy protected signal). I purchased a PS3 a few weeks ago and an expensive HDMI cable. The PS3 doesn't detect a 1080p signal (I've tried all the tricks about settings in the PS3 with ** avail). A guy on a**ther site said the TV needs a firware upgrade. I don't believe this as it used to work fine for over 3 years. I'm capable of replacing the boards myself but need to k**w if there is truely a hardware failure and if so which board is likely the issue. I'm leaning toward the main unit board, KD006, but thinking it might also be the digital board, XD001. Does anyone have any suggestions other than call a repair guy? There is ** Sharp authorized repair in my area and Sharp wants me to ship the set to a center. For the costs of shipping to and from and the parts, I could buy a new tv! Plus I'd be without it for up to 12 weeks. Someone has to have an idea. Thanks in advance.

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I'm a sharp servicing technician and since both the component and hdmi have problems, Im leaning towards the Main board also. If it was the digital board, only the hdmi would have a problem.

If you do end up replacing the main board. ONce youve installed it, check to see if it has the latest firmware version. New boards from Sharp are supposed to be preloaded with the latest firmware, but sometimes they are not.

A firmware upgrade is possible because it deals with this sort of DVI/HDMI compatibility issue. It would be the easiest and cheapest fix. Enter the Service Menu to check what version you have. The latest is version 1.31

good luck.

Posted on Mar 29, 2008

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