Panasonic SA-PT460 - Troubleshooting Guide (F61;F76 Details); Detailed F61 and F76 Troubleshooting

21.1.2. 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
(Q5860,Q5861, Q5862,TH5860,
QR5801)
· Check all the supply line
30V
· Is there any solderability at area
of feedback circuit
· Check feedback circuit (IC5801,
Q5802, D5806, PC5720, D5725)
Touch-up the solder crack area/
Change the defective parts.
· Q5860,Q5861,Q5862,TH5860
(Temperature Detect)
· QR5801 & QR5802 ( 30V
Detect)
· Touch-up the necessary areas
· IC5801, D5806, 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 Output IC (Pin 10 &
14) which have DC Voltage at
Speaker output short to
Vdd/Vss
· If shorted that means D-Amp
damage already.
Change the defective parts.
D-AMP IC:
IC5000/IC5200/IC5300/IC5400
P/N = C1BA00000487
For Configuration
Refer to Table 1
D-AMP
P. C .B.
Refer to
Fig. 2
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
(Q5860,Q5861, Q5862,TH5860,
QR5801)
· Check all the supply line
30V
Re-connect the Fan to CN5501
Fan circuit: Q5640, Q5641,
Q5642, Q5644
Touch-up the solder crack area/
Change the defective parts.
· Q5860,Q5861,Q5862,TH5860
(Temperature Detect)
· QR5801 & QR5802 (
30V
Detect)
Feedback Circuit: IC5801,
PC5720, D5725
D-AMP
P. C .B.
Refer to
Fig. 3
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 Power Supply
P.C.B at pin 8 & 9 of CN2004. 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
+5.3V, +2.5V (For DVD), +6V
(SYS6V), +9V & +18V at
CN2016
· If there is supply voltages of
7V at CN6001
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
Power
Supply
P. C .B
Refer to
Fig. 4
124
SA-PT460EB / SA-PT460EG