No Tv, External Input Video Signal - LG RHT497H Service Manual

11. NO TV, EXTERNAL INPUT VIDEO SIGNAL

no video signal of
external input av3
(Front rca input)
r905 :
is there a
signal ?
yeS
ic901 Pin(56,57,58,
61,62,63,64,65,72) vin_d0-d7, vclk :
is there a signal?
when playing diSc, no audio output
no
check PvM01
& PMv01 Pin8
no
check PMt03
Pin16 & cn1
Pin15
no
cable connection &
input signal
yeS
when cable
connecting tuner and
rear Scart1,2 no tv
video signal (av1/2)
no c859,c896,
c895 : is there a
signal?
ic801
Pin42 : is there a
signal?
check
Pin51
no
/rSt_Saa7138 : is
there a Signal?
x901
(24.576Mhz)
oscillated?
r906,r909
(Scl/Sda) : is there
a signal?
ic901 defect
3-15
yeS
check
ic801 Pin14
no
(12v) Pin30
(5, 3v) Pin31,
32 (Scl, Sda)
:
yeS
replace
ic801
check
no
reset from
ic1101
yeS
no
change x901
yeS
check
no
ic901 power
3.3v & 1.8v
yeS
.
yeS