HDMI Problem !!!

[enesture]

Hi there,

I am connecting my LG laptop(T6500 CPU, 4 GB RAM, GeForce 130M and Win 7 operating system) to my Philips 42PFL7762 LCD TV using 3 mt HDMI cable. Laptop has its own HDMI output. When I watch HD movie, sometimes the display on tv gone and come back in just a second. It happens 3 or 4 times on one movie. The connection is lost and quickly reconnect. It didn't happen when I using the connection through HDTV Mode. Now I am using my TV on PC Monitor Mode and it happens. It never happens when I watch TV connecting Digital Receiver. I cannot figure out. Please help.

Thanks for your interest.

[edDV]

Hi there,

I am connecting my LG laptop(T6500 CPU, 4 GB RAM, GeForce 130M and Win 7 operating system) to my Philips 42PFL7762 LCD TV using 3 mt HDMI cable. Laptop has its own HDMI output. When I watch HD movie, sometimes the display on tv gone and come back in just a second. It happens 3 or 4 times on one movie. The connection is lost and quickly reconnect. It didn't happen when I using the connection through HDTV Mode. Now I am using my TV on PC Monitor Mode and it happens. It never happens when I watch TV connecting Digital Receiver. I cannot figure out. Please help.

Thanks for your interest.

Can you be more specific about your settings for "HDTV mode" and "PC Monitor mode" that you are using?

The GeForce 130M can handle up to 1920x1200 HDMI (2560x1600 with display port) but would be limited to below that by the laptop display native resolution. In dual monitor mode, the chipset should allow separate LCD and HDMI outputs at different resolutions.

The picture breakup you describe is typical of timing errors that increase with longer cable runs or faulty cables. HDMI should be good to 5 meters for normal consumer grade cables and longer for premium cables (larger gauge and better shielding). Try swapping cables and see if the breakup goes away.

Also, per this spec sheet, the 42PFL7762 is limited to the following computer resolutions. It will not accept 1920x1080p in 50/60 Hz. computer mode but will as a direct video feed. Some TV sets limit 1080p to 24 fps for Blu-Ray connection. Check your manual.
http://www.shoppydoo.co.uk/price-lcd_plasma_televisions-philips_42pfl7762d.html

Admitted computer resolution 1024 x 768 (XGA) , 640 x 480 (VGA) , 800 x 600 (SVGA) , 1280 x 768 (WXGA) , 1280 x 1024 (SXGA) , 1360 x 768

Video format input 480p , 720p , 1080i , 1080p , 480i , 576i , 576p

[jagabo]

[quote="edDV"]

The picture breakup you describe is typical of timing errors that increase with longer cable runs or faulty cables. HDMI should be good to 5 meters for normal consumer grade cables and longer for premium cables (larger gauge and better shielding).

Being that he's connected to a computer he is probably running 1920x1080p60 RGB. That would require a lot more bandwidth than the typical 1920x1080i30 YUV from Blu-ray or upscaling DVD players. So cable quality/length may indeed be his problem.

[MOVIEGEEK]

I don't think the cable is the problem because it works fine in HDMI Mode.
It could be a few of things:
1.The HDTV is reacquiring a HDCP handshake, not much you can other than don't use a splitter/switch box.
2.The laptop HDD is busy, turn off any background programs such as anti-virus.
3.ISP is pinging your Wi-Fi/LAN connection, disable it.

[edDV]

[quote="jagabo"]

The picture breakup you describe is typical of timing errors that increase with longer cable runs or faulty cables. HDMI should be good to 5 meters for normal consumer grade cables and longer for premium cables (larger gauge and better shielding).

Being that he's connected to a computer he is probably running 1920x1080p60 RGB. That would require a lot more bandwidth than the typical 1920x1080i30 YUV from Blu-ray or upscaling DVD players. So cable quality/length may indeed be his problem.

Yes, plus the TV spec doesn't list 1080p/60 for computer connection. A new cable may not help.

[enesture]

I can connect the laptop to TV through HDTV or PC Monitor Mode. PC Monitor Mode is much easier than HDTV Mode because all the settings are made automatically and I can get the best picture quality. In HDTV Mode, I have to adjust the "sharpness" and enable "native 1080" for 1:1 pixel mapping etc... But the problem doesn't occur in HDTV Mode. By the way I'm using 1080p for HDTV Mode and 1920x1080 at 60 Hz for PC Monitor Mode. I know this resolution is not listed for PC Monitor, but it works perfect. And plus, the signal never lost on my stolen desktop computer. Maybe the problem is my laptop or a driver problem. I don't know.

[edDV]

I think it is the 1080p RGB 60 Hz issue which has much higher data rate vs. HDTV.

Is the HDMI cable v1.3 rated? Try a different cable or a shorter cable. Otherwise it is probably the TV. You could also try a lower resolution like 1680x1050. The highest supported VESA resolution listed for the TV is 1360 x 768.

[enesture]

First of all I would like to thank edTV, MOVIEGEEK and jagabo. Thanks for your help and interest. The problem seems to be solved in HDTV MODE. For PC MONITOR MODE, I maybe check the cable lenght (try 1.8 mt). Well I understand that improved technology not always gives you happiness; but also comes with little troubles. I missed the SCART CABLE era. The resolution was low, the sound quality was not too good; but you were happy . Ahh old days... Thanks again.