RCA 26LA33RQ Service Manual page 21

5.3 Function Exceptions
5.3.1 TV function
rV can't scan channel/no picture_'y_
Check if p7 No
of T1 have 120data
Check -['v' RF signal
(antenna, cable)
TI power supply circuit is bad
change main board
I2C network is bad,
change main board
Yes
Check if p12 ofT1
have normal voltage
No
IF(l) or AGC(2) circuit is most
likely bad, change main board
Yes
ofT1 has output
signal
No
T1 tuner is bad, change T1
Yes
Check if
between T1 output
U8 is OK
J
Y es
Note: (1) iF: Intermediate Frequency
(2) AGC: Automatic Gain Control
No
Change main board
Change U8 1
Version 1.0
19