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Symptom: rast
er
ok, no
picture, no sound, sparse
noise do
ts
Apply the pointer
of
mul i
t
m
eter at R X 1 KΩ, connect
one probe to GND, use
an
oth
er to touch TB1240N
7.Are ther
e interference
particles flashing on the
screen?
Yes
Unsolder a pin of C108, apply the
pointer of multi meter at R X 1 K
Ω, connect the red probe to GND,
use the black probe to touch B of
Q101. Are there interferenc
particles fla
shing
on the screen?
Yes
Replace the Tuner
Are there
osc
illati
on waves
at P50 and P51 of
TB1240N?
Yes
Is the voltage
No
at P52 of
TB1240N
ok?
In bridge a capacitor of 1000pF
between the input and output of Z101.
Apply the pointer of multi meter at R X
No
1 KΩ, connect the red probe to GND,
e
and use the black probe to touch B of
Q101 Are there interference particles
flashing on the screen
Replace Z1
26--60
Check & Repair Q251, Z252
and their peripheral
Yes
No
Is T271
OK?
No
Check and replair
the
+9V
power
supply
Yes
41 (S
AW)
Replace
TB12
40N
Yes
No
Replace T271
Does the IF
pre-amplifier
work
normally?
No
Yes
Check & repair
the IF
pre-amplifier
circuit
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