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14
A
Do channels
save correctly?
Y
N
1. Check CAS-220
2. Check connect circuit between tuner and CAS-220
3. Check control circuit between main chip (ZR39660) and
CAS-220
Can you change
SRS mode?
Y
N
NOTE: Some Inputs don
’
t support SRS mode
1. Check AP8206AA chip
2. Check control circuit between main chip and AP8206
Can you change
sources?
1. Check video and audio switch chip (FASV330/331, CD4052)
and relevant circuit
2. Check control circuit between main chip and switch chip
N
Y
Does the
display look
correct?
Y
N
1. Check filter circuit after input jacks or tuner
2. For Y/C, RGB, Y/Pb/Pr input:
Check the circuit between MST9883 and switch chip
Check the circuit between MST9883 and main chip
3. For tuner and CVBS input:
Check the circuit between switch chip and main
chip, check chip FM6408 function works correctly
Is the sound
correct?
Have you
checked all
sources?
Y
1. Check filter circuit after input jacks or tuner
2. Check the circuit between the switch chip (CD4052) and
SRS chip
3. Check the AMP functionality
N
N
Does AV output
work correctly?
1. Check FM6413 and relevant circuit
2. Check the CVBS output jack
Y
N
FINISH
Y