LG FLATRON L4200A Service Manual page 24

3. NO RASTER ON VIDEO SIGNAL INPUT
POWER CHECK OF CXA2040(U202) : R248(9V)
POWER CHECK OF UPD64083(U805) : #93 PORT 2.5V
POWER CHECK OF FLI2310(U301) : R308, R311(3.3V), PORT#165(1.8V)
POWER CHECK OF GM1501(U402)
CHECK CABLE OF
VIDEO/COMPONENT
CHECK UPD64083(U8.3)I/O
SIGNAL
CHECK VPC3230(U201) I/O
SIGNAL
CHECK FLI2310(U301) AND
SDRAM(U302) I/O SIGNAL
CHECK GM1501(U402)AND
SDRAM(U401)
NO RASTER ON VIDEO SIGNAL
NO INPUT SIGNAL
NO INPUT SIGNAL
NO OUTPUT SIGNAL
NO INPUT SIGNAL
NO OUTPUT SIGNAL
NO INPUT SIGNAL
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CHECK THE PERIPHERAL
UPD64083(U803)
CHECK THE PERIPHERAL IC
OF VPC3230(U201)
CHECK THE PERIPHERAL IC
OF VPC3230, FLI2310, SDRAM
CHECK THE PERIPHERAL IC
OF GM1501(U402)