Telefunken TF-LED15S27, Service Manual

Page: 17 / 22

TV no searching
/no image
Figure.5 Function Unit
(ATV broke down)
Check External RF
signal input
N
Check
external
RF
equipment
Y
Check the Turner No.2 pin
of U9 have 3.3V
Check power
supply
circuit of L15
Y
N
Check Tuner No. 9,10 pin of U9
Have I2C data
Check pull-up voltage
of I2C network is Ok
N
Y
Check No.5/6 pin of U9 have IF signal
N
Check connect
circuit
Y
Check external circuit
of U9 is OK?
N
Y
Repair its
outer
circuit
N Y
Check video BPF circuit
and
U6(TSUMV29LU)
connect network
Change Tuner
Check BPF\U9 direct connect
network is OK ？