Sony KDL-32BX301 Service Manual ▷ View online
Troubleshooting-3
Check video steps
Does OSD display
on screen?
on screen?
No
Check INVERTER
power & T-CON power
power & T-CON power
Check if signal cable was connected
correctly and has signal output
correctly and has signal output
Yes
Yes
Which input has
no signal?
no signal?
Check if PSU CN6402 has
24V output for INVERTER
24V output for INVERTER
Check if PSU CN6401 has
T-CON_VCC_12V output
T-CON_VCC_12V output
Check MB CN201 pin12
BL_ON/OFF
BL_ON/OFF
Hi Æ Backlight ON
Low Æ Backlight OFF
Low Æ Backlight OFF
RF
Check tuner’s
power & signals
power & signals
2.Check if U701 pin13,
pin14, I2C signal is OK
pin14, I2C signal is OK
1.Check if MB U207
has 5V output
has 5V output
AV
Check signal path
from connector to
MB U401
from connector to
MB U401
1.Check C630 for AV1
2.Check C612 for AV2
VGA
Check signal path
from connector to
MB U401
from connector to
MB U401
1.Check C647 for VGA_R
2.Check C649 for VGA_G
3.Check C653 for VGA_B
3.Check C653 for VGA_B
5.Check R676 for VGA_VSYNC
4.Check R672 for VGA_HSYNC
COMPONENT
Check signal path
from connector to
MB U401
from connector to
MB U401
1.Check C603 for Y
2.Check C606 for Pb
3.Check C611 for Pr
HDMI
Check signal path
from connector to
HDMI switch U4051
from connector to
HDMI switch U4051
1. Check HDMI SW (U4051)
input and output TMDS signal
input and output TMDS signal
2. Record equipment part
number for easy duplicate
number for easy duplicate
Troubleshooting-4
Check audio steps
No voice output
from speakers
from speakers
Check if “Mute”
function is enable or not
Yes
Use remote controller to
Disable “MUTE” function
and increase volume
Disable “MUTE” function
and increase volume
No
Ensure that signal cable is
connected correctly and has
signal output. Check the
earphone jack is not plug-in.
connected correctly and has
signal output. Check the
earphone jack is not plug-in.
Note: speaker will not have output
when plug in earphone jack
when plug in earphone jack
Check PSU CN6401 pin4
AUDIO_12V
AUDIO_12V
Check if MB U801
pin8 & pin11 have 12V
pin8 & pin11 have 12V
No
Yes
Check MB U801
audio output
audio output
Check equipment output
No
MB U801 failure
No
Check MB U801
output signal
output signal
Yes
Yes
Check “MUTE” and “HP” nets circuit
A Board Printed Circuit Board (Top Side)
A Board Printed Circuit Board (Bottom Side)
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