LG MAX221UB Service Manual

2-9
5. USB ERROR CORRECTION FLOW CHART
Only "NO USB" or "USB CHECK" Display?
Something wrong with the USB?
5A 5B
OK
YES
IC805, IC401(52)
YES
NO
Checked the USB VDD?
YES
IC501(4, 5, 7, 9, 12, 44, 49, 51, 74, 77, 81,
102, 104, 116, 117)
NO
Checked the USB
interface IC GND?
YES
IC401(42), R425
NO
Checked the USB
interface IC reset?
YES
X502
NO
Checked the USB
interface IC X-tal?
YES
IC501(52, 53)
NO
Checked the
D+/D- Port?
YES
IC501(52, 53)
NO
Checked the USB
indication Port?

LG MAX221UB Specifications

General

Brand	LG
Model	MAX221UB
Category	Receiver
Language	English