Pioneer VSX-5231 Service Manual page 19

No FL DISPLAY
This is just for general reference and does not including every single case.
No FL DISPLAY
Are the voltage 2.3 Vac to 2.5 Vac?
(FRONT Assy CP703 pins 1, 3)
Are the voltage 2.28 Vac?
(FRONT Assy FLT701
pins 1, 2, 38, 39)
Are the voltage -30 V?
(FRONT Assy CN704A
Is the voltage -30 V?
(FRONT Assy C728 - side)
Is the voltage 3.3 V?
(FRONT Assy C730 + side)
Is damage in FLT701?
Replace FLT701.
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Is the voltage 2.27 Vac
No
(Transformer orange wire)
No
Replace FLT701 or
replace FRONT Assy.
Yes
Check FLT701, R779, R780 or
replace FRONT Assy.
No
Are the voltage -30 V?
No
(CPU Assy CN704B
pins 3, 4)
Yes
Replace FFC.
No
Check L701, IC701 or
replace FRONT Assy.
Yes
No
Check Q702, Q703, R777, R778 or
replace FRONT Assy.
Yes
No
Replace FRONT Assy.
Yes
5
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6
No
to 2.28 Vac?
Replace Power transformer.
Yes
Are the voltage -30 V?
No
(CPU Assy CN209A
pins 3, 4)
Yes
Replace CN209A or
replace CPU Assy.
VSX-523-K
6
7
Are the voltage -30 V?
No
pins 21, 22)
Yes
Replace CP16.
Check Q17, R64, R65, R66, D23,
ZD24, ZD25 on MAIN Assy
or replace MAIN Assy.
7
8
A
B
No
(MAIN Assy CP16
pins 21, 22)
Yes
C
D
E
F
17
8