Sony KDL-50R450A Service Manual ▷ View online
KDL-50R450A 5
SECTION 2 - TROUBLESHOOTING
TRIAGE CHART
Use this general Triage Chart to determine what may possibly be causing the error before going out to the customers location.
1. Confirm the symptom from the customer.
Red Dot: (Primary) Most likely defective part.
2. Select that symptom from the chart.
Blue Triangle: (Secondary) Possible defective part.
3. Bring the primary component listed for that symptom.
5. Chart Color Code.
Power
Audio
2X 3X
6X
Dead set
No
Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No Audio
MAIN BOARD
▲
▲
POWER SUPPLY
LCD PANEL
TCON
▲
▲
Video
Protection Modes
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board
*NOTE: REFER TO LCD PANEL SERVICE MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED ON SERIAL NUMBER.
To access the most recent version of the Triage documents for the models listed in this manual, login into the Sony Authorized Servicer Portal at
http://www.sony.com/asp
.
KDL-50R450A 6
SECTION 2 - TROUBLESHOOTING
FLOWCHARTS AND DIAGRAMS
OVERALL BLOCK DIAGRAM
COMPONENT/
COMPOSITE
RF
AUDIO IN (ANALOG)
HDMI 1 (ARC)
POWER SUPPLY
LED
IR RX
LCD PANEL, TCON
LED BACKLIGHTS
A
H
L
R
OPTICAL AUDIO OUT
MT5389
A/V DECODER
A/V PROCESS
TUNER
USB
HDMI 2 (MHL)
LVDS
AC IN
CLASS D
AUDIO
AMP
G50W
AUDIO OUT
MAIN BOARD
&
CONTROL
KEYS
KDL-50R450A 7
SECTION 2 - TROUBLESHOOTING
POWER AND CONTROL BLOCK DIAGRAM
AC IN (N)
AC IN (H)
1
2
2
A
G50W
CN901
LCD PANEL, TCON
&
LED BACKLIGHTS
MAIN BOARD
POWER SUPPLY
12.5V A
ACD
PWON
1
2
3
2
3
4, 8, 9
GND
DIM
BL_ERR
BL_ON
10
11
12
12V_VT
T-CON_ON
14
15
CN2
5V_SB
12V_SW / AMP
AC_OFF_DET
PS_EN
GND
DIMMING
LAMP_ERR
BL_ON/OFF_OUT
LVDSVDD_1
LVDS_PW R_EN_0
3
2
2
1
13, 14, 15
4, 5, 10, 11, 12
9
6
7
16
8
CN2000
VLED1+
VLED1-
CN8501
VLED2+
VLED2-
VLED3+
VLED3-
VLED4+
1
2
3
4
5
6
3
4
5
6
7
VLED4-
8
VLED5+
9
VLED5-
10
5, 6, 7
5VS
KDL-50R450A 8
SECTION 2 - TROUBLESHOOTING
NO POWER FLOWCHART
No Power
Is standby LED
blinking?
No
Yes
No
See Standby
LED Blinking
flowchart*
Yes
Does red standby
LED on front panel
light steady?
Unplug TV from
AC power. Wait at
least 20 seconds
and re-apply AC
power.
Press power
button while
monitoring Pin 3 of
CN2 on Power
Supply Board.
High (3.3V) on
Pin 3?
High (3.3V) on
Pin 2?
Yes
No
Yes
Power Supply
Board*
Power Supply
Board*
Main Board*
Power Supply
Board
No
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 19
.
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