Read LG 42LH250C (CHASSIS:LD91Z) Service Manual online
Check MAIN B’D
JK405 Pin #1 5V ?
NO
Check MAIN B’D
R848 12V ?
Check that the USB Memory & HDD are supported by Spec
(Refer to User Manual’s USB cautions)
YES
Check MAIN B’D
R801 5V ?
Replace MAIN B’D IC402
YES
NO
Replace MAIN B’D IC808
YES
YES
Replace MAIN B’D IC 100
Check MAIN B’D
JK405 OK ?
YES
NO
Replace MAIN B’D JK405
Making
Revision
2009. 2 . 1
LCD TV
Symptom
USB No Connect Problem
19~42LH250C
Click on the first or last page to see other 42LH250C (CHASSIS:LD91Z) service manuals if exist.