Hola Maybe:
How to decipher the serial number? - Example / VN4B1004026520 /
VN - code factories where manufactured /VN1B1004026520/
* VN - Hungary
* DG - France
* RJ - Poland
* SN - Poland?
* TB - Russia Kaliningrad
* AG - Belgium
* YA - Mexico
* SW -??
1B - called matrix in the tv for 2010 year /VN1B1004026520/
* 1A - LG S-IPS (42PFL5405H/12)
* 1C - LG S-IPS/for 2009year/ and Sharp UV2A RGB /for 2010year/ (40PFL7605/H12)
* 1F - LG S-IPS
* 1G - LG S-IPS /for 2010year/ and /for 2008year A-UO A-MVA/
* 1E - LG S-IPS
* 2A - Sharp (32PFL5605H/12)
* 2B - Sharp UV2A RGB (40PFL7605H/12)
* 2D - Sharp
* 2I - Sharp
* 3A - Sharp UV2A RGB
* 3B - Sharp UV2A RGB (32PFL8605/H12)
10 - year of manufacture /VN1B1004026520/
* 10-2010
* 09-2009
04 - week in which it is produced /VN1B1004026520/
* 04 - fourth week of the beginning of the year
02 -?? / VN1B1004026520 /
65 -??
20 -??
(fuente: AVForums).
SalU2.