Panasonic SA-VK480EE, Service Manual

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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.
x Is there any solder crack at area
(Q5860,Q5861, Q5862,TH5860)
x
Check all the supply line 30V
x
Is there any solderability at area
of feedback circuit
x
Check feedback circuit (IC5801,
Q5802, D5806, PC5720, D5725)
Tou ch-up the solder crack area/
Change the defective parts.
x Q5860,Q5861,Q5862,TH5860
(Tem perature Detect)
x
QR5801 & QR5802 ( 30V
Detect)
x
Tou ch-up the necessary areas
x
I
PC5720, D5725
C5801, Q5802, D5806,
SMPS
P. C.B.
Refer to
Figure 2
First Power ON Display
immediate show "F61". Check Speaker output by using
multi-meter,
x
If there is a DC Voltage around
30V
x
Check Output IC (Pin 10 &
14) which have DC Voltage at
Speaker output short to
Vdd/Vss
x If shorted that means D-Amp
damage already.
Change the defective parts.
D-AMP IC:
IC5000
P/N = C1BA00000492
For Configuration
Refer to Figure 5
D-AMP
P. C.B.
Refer to
Figure 3
Power ON for a while then
only trigger "F61".
(Symptom always happen)
Check the soldering of the SMPS
P. C.B.
x
Is there any solder crack at area
(Q5860,Q5861, Q5862,TH5860)
x
C
x +18V at ZJ2701 (Pin 8 & 9)
heck all the supply line 30V
Touch-up the solder crack area/
Change the defective parts.
x
Q5860,Q5861,Q5862,TH5860
(Tem perature Detect)
x
QR5801 & QR5802 ( 30V
Detect)
Feedback Circuit: IC5801, Q5802
PC5720, D5725, D5806
Main
P. C.B.
D-Amp
P. C.B.
Refer to
Figure 4
Refer to
Figure 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 Main
P. C.B at pin 2,5,8,9 of CN5802.
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, FL1 & FL2
CN2807
x
If there is supply voltages of
+2.7V at CN2801, Pin 19 & 17
+5V at CN2801, Pin 26
+5V at CN2807, Pin 5
x
If there is supply voltages of
9V at CN6001
Check and change the possible
defective parts.
x FP2901 (Fuse Protector),
T2900, D2901, D2906, D2908,
D2909
x
IC4000 (Switching Regulator IC)
& related regulator circuit
components
Refer to
Figure 4
Main
P. C.B.