Toshiba 15DV703R Service Manual page 89

Video problem
Video problem
Is OSD on the
screen?
Check if signal cable
is connected and has
signal output.
Which input has no picture?
RF
Check tuner if
there is signal
to scaler, I2C,
power and
related circuit.
1. Check TM2 #2,6 for the 5V
2. Check TM2 #4,5 for I2C check
82
No
Yes
AV
Check signal Check signal
path from path from
connector to connector to
scaler. scaler.
Check C154
1. Check C172 for VGA_R
2. Check C174 for VGA_G
3. Check C176 for VGA_B
4. Check R91 for HSYNC
5. Check R93 for VSYNC
Check panel power on LVDS cable:
CN12 pin 1, 2,3,4,5 should have 5Vdc
(15"/19"/22"), CN13 Pin 27,28,29,30
should have 12V (26"/32")
Check backlight on/off control:
CN1 pin2 should be 2~3.3Vdc
VGA Component
Check signal path
from connector to
scaler, especially
the Y signal.
1. Check C168 for Y
2. Check C170 for Pr
3. Check C167 for Pb
HDMI
Check signal
path from
connector to
scaler.
1. Check HDMI SW (IC5)
input and output TMDS
signal.
2. Record equipment part
number for easy duplicate.