Originally Posted by Bismarck440
Did not catch any threads on this subject earlier when quering the 901 & temperature issues... the SN's were hard to pin down to exact dates or sequence... infact the codes from the board house did not make sense to me from your pictures... at least from the board houses I currentl deal with, they usually use a sequence of numerical week then 2 digit year. I see you are looking at 2 different model #'s though, the 900 became non existant after production on the 901 was rolling, I has waiting for all the 900's to be purged at my Circuit City before purchasing a 901.... got the first 2 off of different truck shipments if that meant anything, as I was too concerned about the production numbers pressure within the manufacturing plant (I know first hand in an electronics assembly plant how garbage starts to flow through as pressure mounts)
To prove my point I set my T-Stat for 66 today, when returning from work the 901 fired right up... no issues!
(I'm going to set it at 64 tomorrow & see what happens).
Edit: My Bad DigaDo... caught another 2 posts on page 44 on this, though these boxes I have, have issues below 65* not 55*.
The earliest discussions of cool or cold environment performance issues are found in DTT900 threads.
What I deem to be the manufacture date of power supply boards is seen at the top center in my photos. The DTT901 board reads 8 108, working out to be the 108th day of 2008 (8 April 2008). The DTT900 board reads 8 09x (with the last number clipped in the photo--narrowing the date range down to 21/31 March 2008). One of the April 2008 DTT900 models (set up for an elderly lady at church) continues in daily use. She also uses two RCA 800 models but reports that the Zenith is better. The other April 2008 DTT900 was given to a relative who never set it up after getting cable the same day. Perhaps that DTT900 remains in a closet or storage area.
I assumed that Zenith/Insignia CECB production was through a single facility. All the DTT900 and 901 red and black shipping boxes were manufactured in Shanghai China. The build out of DTT900 models probably came to its conclusion on or about 8 April 2008 with initial production of DTT901 models beginning on the same or next day. In my 2008 posts I summarize what I deem to be production date coding, serial number ranges, production codes, performance and sample variations of Zenith and Insignia CECBs.
My two April 2008 DTT901 models, both with 0946 production codes with serial numbers in the 446xxx and 449xxx range, remain in my service but have had little use since 2009. Both performed reliably at last use.
Other DTT901 models coming through my hands include a May 2008 2220 with a serial number in the 546xxx range, a June 2008 1700 with a serial number in the 168xxx range, an August 2008 1092 with a serial number in the 219xxx range and a September 2008 0028 with a serial number in the 489xxx range.
One of the two April 2008 DTT900 models that came through my hands had a 1089 production code with a serial number in the 287xxx range. I've reported data for two other DTT900 models from February and March 2008 in the DTT900 thread.
After comparing serial numbers with those provided by other posters I determined that LG reset the serial number range to 100001 at the beginning of each month. By comparing the highest serial number data for a given month of production and subtracting 100000 it would be possible to estimate total monthly production of Zenith and Insignia CECBs. It seems to me that the Insignia green and black shipping box did not identify production codes.