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This section illustrates the checking procedures when upon detecting the error of “F61” and/or “F76” after power up of the unit. It
is for purpose of troubleshooting and checking in SMPS, D-Amp & Main P.C.B.

Speaker Out
DC Detect

SUBWOOFER

 

CENTER  
FRONT - 

R  

FRONT - 

L  

SURROUND - 

R  

SURROUND - 

L  

 30V Detect

( 30V_SENSE )

SYS6V  

FAN Detect

 

DCDET 2  

DCDE

T2

(F61)

SYS6V  

T

+ 18V Fan Detect

emperature

Detect

DCDET 2  

125

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) 

Tou ch-up the solder crack area/ 
Change the defective parts. 

· Q5860,Q5861,Q5862,TH5860 

(Tem perature 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
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 CN2810 
 
Fan
Q2948 & Q2949

 circuit: Q2942, Q2943, 

Touch-up the solder crack area/ 
Change the defective parts. 
 

· Q5860,Q5861,Q5862,TH5860 

(Tem perature Detect) 

·  QR5801 &  QR5802 (  30V 

Detect)  

Feedback Circuit: IC5801, 
PC5720, D5725 

Main
P. C.B. 

D-Amp
P. C.B. 

Refer to 
Fig. 4 

Refer to 
Fig. 2 

 

 

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 2,5,6,7,8,9 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 
·  If there is supply voltages of 

+5V,+2.7V (For DVD), +6V 
(SYS6V), +9V & +18V at 
CN2807

·  If there is supply voltages of  

9V at CN6001 

 

Check and change the possible 
defective parts. 

· FP2901 (Fuse Protector), 

T2900, D2901, D2906, D2908, 
D2909 

·  IC4000 (DC-DC Converter IC) 

& related regulator circuit 
components 

· IC4001 (DC-DC Converter IC) 

& related regulator circuit 
components 

Refer to 
Fig. 4 

 

Main
P. C.B.

126

Fig. 1 SMPS P.C.B.

127

 

Fig. 2 D-Amp P.C.B

128