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41

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 IC5801, 

D5806,

Q5802,

PC5720, D5725

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/IC5200/IC5300/IC5400
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 fan connection & 
feedback loop: 

x If the fan not proper connected, 

"F61" will trigger when the 
volume increase. 

x If the fan is not working, check 

for fan circuit. 

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 

Re-connect the Fan to CN2810 

Fan
Q2948 & Q2949

 circuit: Q2942, Q2943, 

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

x If t

+5V at CN2807, Pin 5

here is supply voltages of  

9V at CN6001 

Check and change the possible 
defective parts. 

x FP2901 (Fuse Protector), 

T2900, D2901

x  IC4000 (Switching Regulator IC)

& related regulator circuit 
components 

Refer to 
Figure 4

Main
P. C.B.

42

Figure 2 SMPS P.C.B.

43

Figure 3 D-Amp P.C.B.

44

Figure 4 Main P.C.B.