Troubleshooting Charts - Audiovox LC17H2 Service Manual

Troubleshooting charts

1. No raster, no picture and no sound
N
Display LOGO?
Y
Check if output H-V
sync of R, G, B for
X601 of TV board.
N
Replace high
frequency board
Check input 12V and 18V of digital
board
Y
Check if output 5V of
U1 (AP1501-50K5)
N
Check if pin7of N4 is
high level
Y
Check if pin SD of
U1 is low level
Low
Replace U1
N
Replace digital
Y
board
N
Check if output 5V of
5V-STB is normal
Y
Replace IC (N4)
High
Replace V102
18
Connect X1 of the digital
board to X904 of the power
supply board is normal?
Y
Check if output 12V and
18V of X904 of power
supply board
N
Replace power supply
board
N
Replace D102