Toshiba 15SLDT3R, Service Manual

Page: 82 / 87

Video problem
82
Check tuner CVBS
signal to scaler, I2C,
power and related
circuit.
Check signal
path from
connector to the
scaler
Check signal path
from connector to the
scaler
1. CheckU701#4 for the 5V
2. Check U701#7,8 for I2C check
1. Check C604#1 and C605#2, C6102#1
for Y-signal waveform
1. Check C606#1 for Y
2. Check C607#1 for Pr
3. Check C6084#1 for Pb
1. Check C636#1 for VGA_R
2. Check C637#1 for VGA_G
3. Check C639#1 for VGA_B
4. Check R657#1 for HSYNC
5. Check R663#1 for VSYNC
Check signal path
from connector to the
scaler, especially the
Y signal
VGA RF AV/SV Component
Is OSD on the
screen
Yes
Check if signal cable
is connected and
have signal output
Which input has no
picture?
Check panel power on LVDS
cable:
U202 pin 5,6,7,8 should have
5 Vdc(15”/19”/22”),12V(26”)
Check backlight on/off control:
CN201 pin2 should be 2~5Vdc
Video problem
No