39
7.1.2.
Troubleshooting Guide
Symptom
Checking Items
Repair Items
Remarks
FL display blinking with
abnormal segment when
power ON the set or "F61"
Check the soldering of the SMPS
P. C.B.
·
Is there any solder crack at area
(D5802, Q5841, R5842)
·
Check all the supply line 30V
& +18V
·
Is there any solderability at area
of feedback circuit
·
Check feedback circuit.
Tou ch-up the solder crack area/
Change the defective parts.
·
(Tem perature Detect)
·
D5807, QR5840, D5843
( 30V Detect)
·
Touch-up
the
necessary
areas
·
IC5801, PC5720, D5725
SMPS
P. C.B.
Refer to
Fig. 1
First Power ON Display
immediate show "F61".
Check Speaker output by using
multi-meter,
·
If there is a DC Voltage around
30V
·
Check D-Amp IC (Pin 10 &
14) which have DC Voltage at
Speaker output short to
Vdd/Vss
·
If shorted that means D-Amp IC
damage already.
Change the defective parts.
D-AMP IC:
IC5000/IC5200/IC5300
P/N = C1BA00000487
For Configuration
Refer to:
Table 1 D-Amp IC Configuration
D-AMP
P. C.B.
Refer to
Fig. 3
Power ON for a while then
only trigger "F61".
(Symptom always happen)
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
(Q5841, D5840, D5841)
·
Check all the supply line VDD
Re-connect the Fan to CN5501
Fan circuit: Q5640, Q5641,
Q5642, Q5644, D5640
Touch-up the solder crack area /
Change the defective parts.
·
QR5840
Feedback Circuit: IC5801,
PC5720, D5725
D-AMP
P. C.B.
Refer to
Fig. 4
Power ON for a while and
then trigger "F76"
Check all supply voltages as
follows:
Step 1: Check for supply voltages
from SMPS P. C.B to Main P.C.B
at pin 8 & 9 of CN2016. If there are
supply voltages, proceed to Step 2.
If no voltages detected, check wire
connection and circuitry connection
from SMPS P. C.B.
Step 2: Check if there is supply
voltages for Vp, F+ & F- at
CN2016
·
If there is supply voltages of
+
CN2016
5V, +5.3V, +9V & +18V at
·
If there is supply voltages of
7V at CN2017 on Main P.C.B.
Check and change the possible
defective parts.
·
FP2901, FP2902 (Fuse
Protector), T2900, D2901,
D2906, D2908, D2909
·
IC2903 (Switching Regulator)
& related regulator circuit
components
·
IC2900
(Switching
Regulator)
& related regulator circuit
components
SMPS
P.C.B.
Refer to
Fig. 2
D5802, Q5841, R5842
(IC5801, PC5720, D5725)
Summary of Contents for SA-PT470EB
Page 13: ...13 ...
Page 43: ...43 Fig 3 Fan Connector CN5501 ...
Page 49: ...49 9 2 Main Components and P C B Locations ...
Page 109: ...109 ...