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10 Troubleshooting Guide
10.1. Troubleshooting Guide for F61 and/or F76
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 P.C.B..
Symptom(s)
Set cannot Power ON:
Condition 1: With
Standby LED on
Condition 2: With
Standby LED Off or
flickering
Set can Power ON
then F61
Set can Power ON
then F76
Set can Power ON
working normally for
sometime then F61
Checking items
1 Regulator IC IC2900
1
AC cord
2
AC Inlet P5701
3
Fuse F1
1 Transformer T5701
2 Photocoupler PC701
1
DC-DC circuit
2 Photocoupler PC701
1 Thermal Diode D5706
Possible Fault(s)
1
Faulty IC2900 (No +12V
output)
1 Faulty AC cord, loose
connection
2
P5701 solder crack, dry joint
etc
3 F1 Fuse open
1a Pin 14/15 shorted to pin 12/13
1b Fan unit defective
2
Solder crack,dry joint ,short
circuit,open circuit,etc
1a Loose connection at CN100
(No +23V) check cable
connection between CN100 &
H2016
1b No +6V voltage output at pin3,
IC106
1c L125 open
1d Q100 faulty (No +5V voltage
output at pin1,2,5 & 6)
1e Q107 & D114 faulty (No +9V
voltage)
1f IC107 faulty (No +3.3V voltage
output at pin1)
1g K102, K105, K304 open (+3.3V
line going to Panel P.C.B. at
CN203)
2
Solder crack,dry joint ,short
circuit,open circuit,etc
1a
Improper contact between
D5706 to heatsink
1b
OTP (thermal) protection
trigger prematurely
37
Remarks
1) Refer to Fig. 1. SMPS P.C.B.
2) Refer to Schematic Diagram of
SMPS Circuit (Item 17.5)
Refer to Schematic Diagram of
SMPS Circuit (Item 17.5) for
terminal pin count on primary and
secondary terminals
Refer to Fig. 1. SMPS P.C.B.
1) Refer to Fig. 2. Main P.C.B.
2) Refer to Schematic diagram of
Main Circuit (Item 17.3)
Refer to Fig. 1. SMPS P.C.B.
Refer to Fig. 1. SMPS P.C.B.
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Table of Contents
Troubleshooting
