TX-50CX670E, TX-50CX680E, TX-50CXR700 (serv.man2) - Panasonic TV Service Manual (repair manual). Page 9

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1. eMMC (IC8920) 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 eMMC (IC8920).
All KEY are not generated for all models.
The necessary KEY are only generated and stored depend on the feature of models.

When Main IC (IC8000) is replaced, eMMC (IC8920) should be also replaced with new one the same time.
When eMMC (IC8920) 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 more 
than 3 seconds.
TV will be forced to the factory shipment setting after this SELF CHECK.

Model No.

Keys

One-to-One

(For USB Rec.)

CI Plus

DTCP-IP

WIDEVINE

Netflix

HDCP2.2

TX-50CX670E

None

Yes

Yes

Yes

Yes

Yes

TX-50CX680E

None

Yes

Yes

Yes

Yes

Yes

TX-50CXR700

None

Yes

None

Yes

Yes

Yes