29B-FX1
TROUBLE SHOOTING TABLE (Continued)TROUBLE SHOOTING TABLE (Continued)
NO PICTUREB
No snow noise.
Does the snow noise appear
Yeson the picture tube at max No
Snow noise increase.
contrast and brishtness B
control?
Check pin (6) and (7) IC800.
Does 5V appear at pin (6) and (7) NoCheck IC600, L200, TU200
of TU200 (TUNER).etc.
YesNormalAbnormal
Does 33V appear at pin (9) of No
Check IC1751, L201 etc.Noise or signal Check TU200(TUNER),
TU200.
appear.SF200 and its related parts.
Yes
Check TU200, TP201 etc.
Is AV1, AV2, AV3 or Yes
Check Q455 and their
input normal?
peripheral circuit.
No
18
Check pin (43) of
No Check IC400 and its
IC400 noise or signal
(Noise) peripheral circuit.
appear?
Yes
(Signal)
Check pin (39) of Are pin (7), (8) and (9) of
YesCheck IC800 RGB Yes
IC800 noise or signal IC850.
(Signal) out Normal?
appear?
NoNoYesNo
(Noise)
Check IC400, Q401, Check IC800 and Check the Check IC850 and
and their peripheral their peripheral peripheral circuits their peripheral
circuit.circuit.of screen heater circuit.
(FBT) and the CRT.
18-118-2 |
ACEC
