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SA-BX500EB / SA-BX500EE / SA-BX500EG
15.1.2. Troubleshooting Guide
Symptom
FL display blinking with
abnormal segment when
power ON the set or "F61"
First Power ON Display
immediate show "F61".
Power ON for a while then
only trigger "F61".
(Symptom always happen)
Power ON for a while and
then trigger "F76"
Checking Items
Check the soldering of the SMPS
P. C.B.
·
Is there any solder crack at area
(Q5860,Q5861, Q5862,TH5860,
QR5801)
·
Check all the supply line
·
Is there any solderability at area
of feedback circuit
·
Check feedback circuit (IC5801,
Q5802, D5806, PC5720, D5725)
Check Speaker output by using
multi-meter,
·
If there is a DC Voltage around
30V
·
Check Output IC (Pin 10 &
14) which have DC Voltage at
Speaker output short to
Vdd/Vss
·
If shorted that means D-Amp
damage already.
Check the fan connection &
feedback loop:
·
If the fan not proper connected,
"F61" will trigger when the
volume increase.
·
If the fan is not working, check
for fan circuit.
Check the soldering of the SMPS
P. C.B.
·
Is there any solder crack at area
(Q5860,Q5861, Q5862,TH5860,
QR5801)
·
Check all the supply line
Check all supply voltages as
follows:
Step 1: Check for supply voltages
from SMPS P.C.B. to Main P.C.B.
at Pin 2, 5, 8, 9 of CN7001. If there
are supply voltages, proceed to
Step 2.
If no Voltages detectd, check wire
connection and circuitry connection
from SMPS P.C.B.
Step 2: Check if there is supply
voltages for FL-Vp, FL+5V at
PB502.
Step 3: Check if there is supply
voltages of +33V (D+3R3V),
+5V (WL_D5V & D+5V),
+11V (SP_RELAY+11V),
+75V (A+7R5V) & -7.5V (A-7R5V)
Repair Items
Tou ch-up the solder crack area/
Change the defective parts.
·
Q5860,Q5861,Q5862,TH5860
(Tem perature Detect)
·
30V
QR5801 & QR5802 ( 30V
Detect)
·
Tou ch-up the necessary areas
·
IC5801, D5806, PC5720,
D5725
Change the defective parts.
D-AMP IC:
IC5000/IC5200/IC5300/IC5400
P/N = C1BA00000487
For Configuration
Refer to Table 1
Re-connect the Fan to CN5501
Fan circuit: Q5640, Q5641,
Q5642, Q5644
Tou ch-up the solder crack area/
Change the defective parts.
·
Q5860,Q5861,Q5862,TH5860
(Tem perature Detect)
·
QR5801 & QR5802 ( 30V
30V
Detect)
Feedback Circuit: IC5801,
PC5720, D5725
Check and change the possible
defective parts.
·
IP7001 (Fuse Protector)
T7001, D7002, D7003, D7004,
D7005, D7006
·
IC7004 (DC-DC Converter IC)
& related regulator circuit
components
·
IC7704 (DC-DC Converter IC)
& related regulator circuit
components
128
Remarks
SMPS
P. C.B.
Refer to
Fig. 1
D-AMP
P. C.B.
Refer to
Fig. 2
D-AMP
P. C.B.
Refer to
Fig. 3
Main
P.C.B.
Refer to
Fig. 4
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