.mkv doesnt play on LED:UA32C5000 but plays on LCD:LA32C530

I HAVE RECENTLY PURCHASED SAMSUNG LED SERIES 5 UA32C5000 IN INDIA.

What I have observed till now that through the USB 2 Video connection,I am not able to play some *.mkv* and *.mp4* video files.
I get the error Video Codec not supported.
I thought it might be a compatibility issue.
But I went to the Samsung Showroom from where I purchased my LED and conducted the same test using the same files which
wont play on my LED on a SAMSUNG LCD SERIES 5 LA32C530 and all the other series 5 LCD models.
And on the LCD models I was able to play all those video files without any glitch or error.
I went to Samsung website and downloaded the PDF user guides for both these models LCD: LA32C530...and LED : UA32C5000
and I observed that video codecs supported table is exactly the same for both these models.
So I am surprised that how is it possible on an LCD(same series 5) but not LED,which is supposed to be a more advanced model..

I am giving the details of one of the files which I was trying to play on LED(didn't work) but worked on LCD model..

Format : Matroska
File size : 47.7 MiB
Duration : 23mn 9s
Overall bit rate : 288 Kbps
Encoded date : UTC 2010-06-17 19:57:07
Writing application : mkvmerge v2.0.2 ('You're My Flame') built on Feb 21 2007 23:40:55
Writing library : libebml v0.7.7 + libmatroska v0.8.1
Cover : Yes

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : [email protected]
Format settings, CABAC : Yes
Format settings, ReFrames : 7 frames
Muxing mode : Container [email protected]
Codec ID : V_MPEG4/ISO/AVC
Duration : 22mn 58s
Nominal bit rate : 250 Kbps
Width : 592 pixels
Height : 332 pixels
Display aspect ratio : 16:9
Frame rate : 23.810 fps
Resolution : 8 bits
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.053
Writing library : x264 core 55 svn-656M
Encoding settings : cabac=1 / ref=4 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=7 / brdo=1 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=0 / threads=3 / nr=0 / decimate=1 / mbaff=0 / bframes=3 / b_pyramid=1 / b_adapt=1 / b_bias=0 / direct=3 / wpredb=1 / bime=1 / keyint=480 / keyint_min=25 / scenecut=40(pre) / rc=2pass / bitrate=250 / ratetol=1.0 / rceq='blurCplx^(1-qComp)' / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30


So what I need to know is why this is happening or is there any kinda of workaround or Firmware Upgrade needed to be done on the LED to play
the same format which works flawlessly on a simple LCD TV.
Or I am seriously contemplating replacing the LED with LCD as it also costs Rs.12K more than the LCD model.


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Sid