Equivalent for ISL88550AIRZ on JBL00 LA-3801P Rev 2.0 (A01)

[vettouch]

Hi members, I have DELL_E6400 with display fault, I presumed after test with DMM. No voltage on RAM section. RAM IC has voltage, but no output voltage.

Which other IC can be used for replacing ISL88550AIRZ? Thanks for your anticipated assistance. Vettouch