Sony KDL-48R485B Service Manual ▷ View online
KDL-48R485B 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.
User
Interface
NG
No Picture
(UI OK)
Audio
2X 3X 4X 5X 6X
USB
Tuner
Tuner
Video
SCART
MAIN BOARD
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
LIGHT SOURCE BOARD
OPEN CELL
AC ADAPTOR
SPEAKERS
LS HARNESS
SPEAKER HARNESS
Board
Reference
Symptoms - Shutdown.
Power LED blinking
red diagnostics sequences
MAIN HARNESS
FFC CABLE
Component
HDMI
MHL
HP
Main
Speaker
Video
SCART
USB
Component
HDMI
*NOTE: REFER TO LCD PANEL SERVICE MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED ON SERIAL NUMBER.
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.
4. Follow the associated flowcharts in the Training Manual to isolate the board.
KDL-48R485B 6
SECTION 2 - TROUBLESHOOTING
FLOWCHARTS AND DIAGRAMS
OVERALL BLOCK DIAGRAM
COMPONENT/
COMPOSITE
RF
AUDIO IN (ANALOG)
HDMI 1 (MHL)
AC ADAPTER
LED
IR RX
LCD PANEL, TCON
LED BACKLIGHTS
BIL
H
L
R
OPTICAL AUDIO OUT
MT5560
A/V DECODER
A/V PROCESS
TUNER
USB
HDMI 2 (ARC)
LVDS
AC IN
AUDIO
AMP
AUDIO OUT
MAIN BOARD
&
CONTROL
KEYS
Wi-Fi
LD
BOARD
DEMOD
HP
AMP
KDL-48R485B 7
SECTION 2 - TROUBLESHOOTING
BL_VCC01
3
1
3
1
VCC
BL_LED01
5
2
5
2
LED1-
BL_LED02
6
3
6
3
LED2-
BL_LED03
7
4
7
4
LED3-
BL_LED04
8
1
8
1
VCC
BL_VCC02
4
2
4
2
LED4-
BL_LED05
9
3
9
3
LED5-
10
4
LED6-
BL_VCC01
1
NC
BL_VCC02
2
NC
BL_LED06
10
4
LVDS_SEL
1
51
1
51
SEL1/LVDS
NC
2
50
2
50
TCON_RDY
NC
3
49
3
49
NC
LUT_SEL2
4
48
4
48
LUT_SEL2
LUT_SEL1
5
47
5
47
LUT_SEL1
LUT_SEL0
6
46
6
46
LUT_SEL0
NC
7
45
7
45
NC
NC
8
44
8
44
PANEL_SEL
BUS-SW
9
43
9
43
BUS_SW
NC
10
42
10
42
NC
SDA
11
41
11
41
SDA_C
SCL
12
40
12
40
SCL_C
GND
13
39
13
39
GND
RX4P_EVEN
14
38
14
38
RX1_EP_I
RX4N_EVEN
15
37
15
37
RX1_EN_I
RX3P_EVEN
16
36
16
36
RX1_DP_I
RX3N_EVEN
17
35
17
35
RX1_DN_I
GND
18
34
18
34
GND
RXCLKP_EVEN 19
33
19
33
RX1_CLKP_I
RXCLKN_EVEN 20
32
20
32
RX1_CLKN_I
GND
21
31
21
31
GND
RX2P_EVEN
22
30
22
30
RX1_CP_I
RX2N_EVEN
23
29
23
29
RX1_CN_I
RX1P_EVEN
24
28
24
28
RX1_BP_I
RX1N_EVEN
25
27
25
27
RX1_BN_I
RX0P_EVEN
26
26
26
26
RX1_AP_I
RX0N_EVEN
27
25
27
25
RX1_AN_I
GND
28
24
28
24
GND
RX4P_ODD
29
23
29
23
RX0_EP_I
RX4N_ODD
30
22
30
22
RX0_EN_I
RX3P_ODD
31
21
31
21
RX0_DP_I
RX3N_ODD
32
20
32
20
RX0_DN_I
GND
33
19
33
19
GND
RXCLKP_ODD
34
18
34
18
RX0_CLKP_I
RXCLKN_ODD 35
17
35
17
RX0_CLKN_I
GND
36
16
36
16
GND
RX2P_ODD
37
15
37
15
RX0_CP_I
RX2N_ODD
38
14
38
14
RX0_CN_I
RX1P_ODD
39
13
39
13
RX0_BP_I
RX1N_ODD
40
12
40
12
RX0_BN_I
RX0P_ODD
41
11
41
11
RX0_AP_I
RX0N_ODD
42
10
42
10
RX0_AN_I
GND
43
9
43
9
GND
GND
44
8
44
8
GND
GND
45
7
45
7
GND
NC
46
6
46
6
NC
POWER
47
5
47
5
VIN
POWER
48
4
48
4
VIN
POWER
49
3
49
3
VIN
POWER
50
2
50
2
VIN
POWER
51
1
51
1
VIN
LED BACKLIGHTS
BIL BOARD
CN9000
CN200
CN300
CN8600
SOURCE BOARD
POWER AND CONTROL BLOCK DIAGRAM
KDL-48R485B 8
SECTION 2 - TROUBLESHOOTING
NO POWER FLOWCHART
No power
No
See Standby
LED Blinking
flowchart
Yes
No
AC Adaptor*
Replace the
19.5V AC Adaptor
Main Board*
Does the
TV turn
ON?
Yes
Is red standby
LED on front panel
blinking?
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 16
.
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