95 Technical Descriptions5.1. Specification of KEY for DTCP-IP, One-to-One, Widevine and Netflix5.1.1. General information:1. NAND Flash (IC8900) for spare parts has the seed of KEY for each.2. The final KEY data will be generated by Main IC (IC8000) when SELF CHECK was done and are stored in both Main IC(IC8000) and NAND Flash (IC8900).Four KEY are not generated for all models.The necessary KEY are only generated and stored depend on the feature of models.5.1.2. Replacement of ICs:When Main IC (IC8000) is replaced, NAND Flash (IC8900) should be also replaced with new one the same time.When NAND Flash (IC8900) is replaced, Main IC (IC8000) is not necessary to be replaced the same time.After the replacement of IC, SELF CHECK should be done to generate the final KEY data.How to SELF CHECK: While pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote control for morethan 3 seconds.TV will be forced to the factory shipment setting after this SELF CHECK.5.1.3. Model and Keys:5.2. USB HDD Recording5.2.1. General information:Digital TV programmes can be recorded in USB HDD.A One-to-One key generated in A-board by SELF CHECK binds TV and USB-HDD for communication.That key is only one key for them. If the key is difference, TV can not access USB-HDD.Caution:New key will be generated by following SELF CHECK and previous TV programmes recorded in USB HDD will not beviewed.SELF CHECK: While pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote control formore than 3 seconds.5.3. Panel-Type settingPanel-Type setting is required after exchange the A-board.A-board for spare parts is common use for different inch size in same series.Go into Service Mode and confirm/select Panel-Type in OPTION to correct inch size.Model No. KeysOne-to-One(For USB Rec.)DTCP-IP WIDEVINE NetflixTH-P50ST60A Yes None Yes YesTH-P50ST60D/M None None Yes YesTH-P50ST60Z Yes Yes Yes Yes