Sony KDL-32BX320 / KDL-32BX321 / KDL-32BX420 / KDL-32BX421 / KDL-40BX420 / KDL-40BX421 / KDL-46BX420 / KDL-46BX421 Service Manual ▷ View online
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 32
SECTION 5 - FLOW CHARTS AND DIAGRAMS
Video Distortion
Is distortion
across entire
screen?
Any horizontal
lines?
No
No
Yes
Yes
Improper of
missing colors?
Yes
A Board
No
Vertical lines
or bars?
No
Yes
Lines move
when wide-
mode
changed?
Yes
No
TCON
(LCD Panel)
A Board
LCD Panel
Any single or
isolated vertical
lines?
Yes
LCD Panel
More than 1
vertical band?
No
Yes
TCON
(LCD Panel)
FIGURE 5-2. VIDEO DISTORTION FLOWCHART
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 33
SECTION 5 - FLOW CHARTS AND DIAGRAMS
POWER SUPPLY INFORMATION
No Power
Is standby LED
blinking?
No
Yes
No
See protection
flowchart
Yes
Does red standby
LED on front panel
light?
Press power
button while
monitoring pin 3 of
CN6401 on power
supply board
High (3.3V)
on pin 3?
Yes
No
A Board
G13 board (32")
G14 board (40")
G3 board (46")
High (3.3V)
on pin 2?
Yes
G13 board (32")
G14 board (40")
G3 board (46")
G13 board (32")
G14 board (40")
G3 board (46")
No
FIGURE 5-3. POWER SUPPLY FLOWCHART
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 34
SECTION 5 - FLOW CHARTS AND DIAGRAMS
PROTECTION INFORMATION
Protect
Shutdown.
Standby LED
Blinking
No
Yes
No
Yes
2X
A Board
3X
5X
No
Yes
LCD Panel
6X
Yes
7X
No
Immediately
After a While
Check room
temperature and
ventilation around
unit
G13 board (32")
G14 board (40")
G3 board (46")
A Board
“SONY” logo
appears before
shutdown?
Yes
No
LCD Panel
G13 board (32")
G14 board (40")
G3 board (46")
FIGURE 5-4. PROTECTION SHUTDOWN FLOWCHART
KDL-32BX320/32BX321/32BX420/32BX421/40BX420/40BX421/46BX420/46BX421 35
SECTION 5 - FLOW CHARTS AND DIAGRAMS
UNREG24V
BL-ON
GND
BL_ERR
1~5
6~10
11
12
12
STBY3.3V
AUDIO_12V
AC_OFF_DET
POWER_ON
1
2
3
4
2
3
4
AUDIO_GND
BL_ERR
REG12V_GND
REG12V
5
6, 7
8, 9
8, 9
10
BL_ON
TCON_12V
DIMMER
N/C
11
12
13
14
12
13
14
TCON_ON
15
AC IN (N)
AC IN (H)
1
2
2
CN6401
A
N/C
DIMMER
13
14
14
CN6402
TO
INVERTER
REG 12V
N/C
GND
AUDIO_12V
1,3
2, 4, 6
5
7
7
DIMMER
BL_ERR
8
9
9
CN202
TCON_12V
11
AC_FF_DET
TCON_ON
12
13
13
BL_ON
10
STBY 3.3V
14
N/C
15
POWER_ON
16
G13 (32")
G14 (40")
G3 (46")
G14 (40")
G3 (46")
FIGURE 5-5. POWER AND CONTROL BLOCK DIAGRAM
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