Sony KLV-32W6*D Service Manual page 34

3-2. NO POWER
3-2-5. Protection Circuit– Checking Procedure
Start
B-Board
Check voltage at
NO (0V)
Q6020 (PIN5-PIN8)
18V-22.5V?
YES
Refer
'No Power -DDCON Checking Procedure'
Refer
Adaptor Checking Procedure
B-Board
Check voltage at
YES
Q6020 (PIN1-PIN3)
18V-22.5V?
NO
B-Board
Remove Q6020 &
SHORT
Check 19.5V_ADP line by
continuity test.
Short or OK?
OK
Refer
Adaptor Checking Procedure
B-Board
9V–11V
Check voltage at Q6020 – PIN4
9V–11V or 18V–22.5V?
18V–22.5V
J6001 or Q6019 damage or
Adaptor not inserted properly
B-Board
Remove J6001 &
Check 19.5V_ADP line by
continuity test.
Short or OK?
OK
J6001 Damage
B-Board
Replace Q6020 &
YES
Check voltage at
Q6020 (PIN5-PIN8)
18V-22.5V?
NO
Refer
'Fuse Checking Procedure'
B-Board
Check & remove any foreign material
On the board.
SHORT
Check 19.5V_ADP line by
continuity test.
Short or OK?
OK
Foreign Material
Q6020 Damage
SHORT
PWB
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