Vizio P42HDTV10A Service Manual page 96

2. Clock Timing
(1) MT8205 Clock (Ch1 U9-A15, XTALI / Ch2 U9-B15, XTALO)
(2) Memory Clock (Ch1 U11-45, D_CLK / Ch2 U12-45, D_CLK)
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File No. SG-0184