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2. raster, but no picture
Check if the unit can operation?
yes
Check if the all channels have signal?
no
no no
Enter
factory-menu, CLEAR then turn
Replacing CPU board
operation EEPROM,
Which is no VGA/DVI signal of channels YPRPB TV Testing power supply (+5V-V) of video processing board no
Replacing CPU board
off , turn on again , it if display picture. yes Adjust CPU board again
Check input 24V of sound conversion board no Check input 24V-A of CPU board
Replacing U30
no
Testing PIN65 of U30 SYNC signal
yes
Display �NO-SIGNAL� no
yes
no Check output 24V-A of power supply board
Replacing U13
no
Testing 1VPP signal of TP1, TP2, TP3.
yes Replacing CPU board
Check if PIN2 1VPP signal and noise wave of P32? yes Check if PIN56 15.734KHz sync signal of U29? no Replacing U29
no
Replacing TUNER202
yes
2
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