Sony KDL-70R520A Service Manual ▷ View online
KDL-70R520A 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.
LAN Power
Audio
2X 3X 5X 6X
No
WIFI Dead set
No
Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No Audio
MAIN BOARD
▲
▲
▲
POWER SUPPLY
LCD PANEL
TCON
▲
▲
WLAN
▲
▲
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-70R520A 6
SECTION 2 - TROUBLESHOOTING
FLOWCHARTS AND DIAGRAMS
OVERALL BLOCK DIAGRAM
RF
HDMI 1 (ARC)
PC HD15
POWER SUPPLY
SWITCH
UNIT
IR RX
LIGHT SENSOR
A
H
L
R
ANALOG AUDIO OUT
OPTICAL AUDIO OUT
OPTICAL AUDIO OUT
MT5396
A/V DECODER
A/V PROCESS
TUNER
USB 1
HDMI 2 (MHL)
LVDS
AC IN
CLASS D
AUDIO
AMP
HDMI 3
HDMI 4
HDMI 4
ETHERNET
USB 2
LVDS
MAIN BOARD
LED
PC IN R/L (AUDIO)
AMP
HEADPHONE AUDIO OUT
WIFI
GE70 (70”)
LCD PANEL, TCON
LED BACKLIGHTS
&
COMPONENT/
COMPOSITE
COMPOSITE
KDL-70R520A 7
SECTION 2 - TROUBLESHOOTING
POWER AND CONTROL BLOCK DIAGRAM
STBY3.3V
AUDIO_12V GND
AC_OFF_DET
POWER_ON
1
2
3
2
3
4, 5
BL_ERR
REG12V_GND
AUDIO_12V
6, 7
8
12
BL_ON
PWM_DIMMER
N/C
13
14
15
14
15
AC IN (N)
AC IN (H)
1
2
2
CN2
A
REG 12V
GND
AUDIO_12V
2, 7
6
BL_ERR
1
12
CN201
TCON_12V
AC_OFF_DET
13
14
14
BL_ON
3, 8
STBY 3.3V
POWER_ON
4
GE70 (70”)
CN1
LCD PANEL, TCON
&
LED BACKLIGHTS
7
9
11
LED1 +
1
3
5
5
CN3
POWER SUPPLY
MAIN BOARD
REG_12V
9~11
5
BL PWM
GND
9, 11
10
13
15
15
LED1 -
LED2 +
LED2 -
LED3 +
LED3 -
LED4 +
LED4 -
KDL-70R520A 8
SECTION 2 - TROUBLESHOOTING
NO POWER FLOWCHART
No Power
Is Standby LED
blinking?
No
Yes
No
See Stanby
LED Blinking
Flowchart
Yes
Does red
Standby LED on
front panel light?
High (>2.5V)
on Pin 3 of CN2
on Power Supply?
Yes
No
Main Board*
Press power
button while
monitoring Pin 2
of CN2 on
Power Supply
Board.
High (3.3V)
appears
momentarily?
Yes
No
Power Supply
Board*
Power Supply
Board*
Power Supply
Board*
Remove AC power and
wait at least 30
seconds before
reapplying.
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 20
.
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