He continued to be the voice of Doraemon throughout the decades, only being briefly replaced in 1992 when he went over to the rival station Asia Television for a short period.

Lam's continuous involvement sets Hong Kong's Doraemon apart from the original Japanese production which went through a re-launch in 2005, resulting in a complete change of voice cast.

Lam and other cast members at the time reprised their roles when TVB started to broadcast the new 2005 series.

Outside animation, he was also the voice of the corrupt Qing dynasty official Heshen in the 2001 Chinese television series The Eloquent Ji Xiaolan, which remained his favourite role.

His last work was the 3D feature film Stand by Me Doraemon, which had yet to be released in Hong Kong at the time of his death.