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Technosonic 1908 ticking
simondgoodman:
I have a Technosonic 1908 and there is ticking coming from the motherboard around the area of the psu.
I have replaced the two three pin diodes, but still ticks. Any advice really welcome.
tv tony:
the two surface mount diodes that kick start the psu fail, about 330k each, also the 5.6ohm that is the feedback resistor goes oc, if you want circuit refs i will give you them when i return to work
is the standby led flashing or steady
tv tony
tv tony:
that should read resistors, and also the two diodes on the sink are schottky type
Turnip:
Hi, have had this problem with a couple of Technica (Tesco) sets, where it is difficult to remove the diode fixing screws as access is fouled by the chopper transformer. In both cases it was the LH side double shottky that was S/C and was replaced by a shottky with a higher voltage rating - no comebacks yet.
Turnip
tv tony:
yes but he said hes replaced the diodes, we bought all semssens stock when they folded, and the 3 resistors do fail, two in the start up straight from the 330v line and the one in the feedback 5.6ohm
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