Panasonic SA-PT170PH - Page 37

37
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 VDD 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.
(DCDET)
(D5807)
Touch-up the necessary areas
IC5801, PC5720, D5725
SMPS
P. C . B .
Refer to
Fig. 1
First Power ON Display
immediate show "
Check VCC to Power
Amplifier IC (Pin 1)
Check Q5749, Q5750,
Q5753, Q5754, Q5747,
Q5748
F61".
Check speaker output by
using multi-meter
Check Power Amplifier
IC (Pin 1)
Change the defective parts.
Power Amplifier IC
IC5100/IC5200/IC5300
P/N = AN17831A
Replace necessary parts.
Analog
AMP
P.C.B
Refer to
Fig. 3
Analog
AMP
P.C.B
Refer to
Fig. 4
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
(D5802, Q5841, Q5842)
Check all the supply line VDD
Re-connect the Fan to CN5704
Fan circuit: Q5740, Q5742,
Q5741, Q5744, D5755, D5745
Touch-up the solder crack area/
Change the defective parts.
D5802, Q5841, R5842
(DCDET)
D5840, D5841, D5842, D5843
Feedback Circuit: IC5801,
PC5720, D5725
Power ON for a while and
then trigger "F76"
Check and change the possible
defective parts.
FP2901(Fuse Protector),
T2900, D2901, D2906,
D2908, D2909
IC2903 (DC-DC Converter IC)
& related regulator circuit
components
IC2900 (DC-DC Converter IC)
& related regulator circuit
components
SMPS
P.C.B.
Refer to
Fig. 2
(D5802, Q5841, R5842)
( 30V Detect)
Check if there are supply
voltages from SMPS P.C.B
to Main P.C.B. at CN2016
& CN2017:
CN2016 F (Pin 1), VP (Pin 3),
F (Pin 2)
CN2016 5V (Pin 7), av (Pin 8),
18V (Pin 11)
CN2017 7V (Pin 1)