1.type 25S1EK MX II
No vision - wont tune in. C119 (47n) IF unit on
pin 2 IC101.StBy LED changes red to green but
no line drive.Check Q902 V if missing R903 (2K2)
After 5 Mins Pic shakes from left to right some
times violently. Text ok but in mix mode no
sync.C02 or 6Mhz crystal.Comes on for 10secs
with LEDS lit but no picture and then goes off.
Remove plug "Q", AT if psu runs 127v, replace
Picture looks to have hum bar on it. L2001 in
chopper base feed oc Pt-No CELC005-2R5.
Repeated failure IC3101. Change C105 to 4.7uF
link -VE to IC3101 h/sink.
3.AV21H1EK AV25F1EK JX
Int RF, could be mistaken for tuner. Clue is No
OSD. IC522 dry joints.
Starts up then shuts down. Q031 oc.
No Teletext. SAA5243P/E on text panel.
Pic pulsing, HT constant. DJ - hairline crack
on C011 PSU panel.
Dim pic. C1206 leaky (3.3uf).
No line drive. R903 (2.2k) base bias to Q902
Int loss of sound and picture. AGC preset int
No nicam LED. D102 dry (green led).
No sound. ICP on audio sub - PCB (check 12V on
Hour Glass effect. Replace both memory chips.
Set switches off, changes channel, adjusts volu
me etc all int!!. Crystal on sub panel dry.
Not switching to standby. Q903 (2SA1370), also
check Q902 and Q904.
Stuck in standby. D581 open.
Wont go to sby, just dims picture. Q1901 s.c.
At switch on the set comes on in standby. When
the standby key is pressed the relay can be heard
to click but nothing more happens. No sound or
vision. R323 (6K8/5W) fusible resistor o/c.
The set would come out of standby and appear to
be working quite normally for several minutes.
It would then shut down to standby without
warning. Pressing standby again would bring it
back to life for another few minutes when the
same thing would happen again. R323 (6K8 5watt
O.M.F. Resistor) fusible was going o/c
Sound muted/erratic and non linear/erratic
frame scan at the bottom of the screen. First
check to see if the auto search tuning stops on
channels or just skips past the stations.
If the auto tuning fails to stop change the
Q605, Q618, Q619, Q620, Q621-----(2SC1815-Y)
R403, R404, R433, R434, R435------(0R68/0.5W safety)
The last time I had this symptom it turned out
to be just C433. Tip supplied by Stephen Rawlings.
Int. Switches to standby. D507, D508, Q508 and
Power supply not starting up. C910 (0.1µF). No
remote control. X601, wrong part fitted, should
be 4MHz it had a 17MHz one fitted the same as
the TeleText XTAL.
No sync. X002 6Mhz XTAL us on text PCB.