Vivitek RP56HD21-A - Manual (Page 44)

Replacing the Lamp
You should replace the lamp in the RPTV approximately every 6000 hours to
maintain the best possible display image. Do not use a lamp past the rated lamp
life.
Warning The high-pressure lamp may explode if handled incorrectly. Make
sure that your Micro Chip Display Projection TV is turned off, power
is disconnected, and the lamp is completely cool (minimum of 45
minutes) before replacing the lamp.
To replace the lamp :
1 Turn off your Micro Chip Display Projection TV.
2 Disconnect the power cord and all other external cables.
3 Let the lamp cool completely (approximately 45 minutes).
4 Remove the two lamp access panel screws, then remove the access panel.
5 Remove the two lamp module retaining screws.
Screws
Screws