White Screen - RCA 50LB45RQ Service Manual

5ol DispJay Exceptions
5.1.2 White screen
White screen
No
the
supply for panel works
check the voltage on the
PIN no.1-3 of
Yes
No
Yes
voltage on C-pole
is at low lew
Yes
Replace Q7
is voltage on S-pole
of Q7(5V or 3.3V)
No
No whether
Ithe jumper of CN2?,
is in good contact
Yes
Replace CN:_ or Check the power
jumper supply of 5V or :X :W
o m m u n ica tio n between
i_normal
NO
Replace relevant
resistor array
Yes
heck
pole of Q8 has a _.
level (0.6V) or the ,_
nt-end voltage of J
Replace the master
chip(U8)
Yes
whether
group signal of CNI?
No has an open circuit
short circuit
Replace Q8 or R27
Replace the master
chip(Ug)
Yes
Overhaul the PCB
and CN]? of
relevant lines
Version 1.0
14