this one came in with flashing blue red standby led.
power supply 17ips10-3 v.1,mainboard 17mb45m-2
the power supply has intergrated inverter bit of a pain,no markings for voltages etc,also used in bush,sylvania etc,it has a touch panel on the side for the usual adjustments ,.
these NORMALLY suffer with the inverter output ceramic caps (3kv),on c231 &c230,an insulation test confirmed they were fine,and capacitance was within tolerance,all other lytic caps tested for esr returned good results.
i had all stable voltages ,but no voltage in inverter section??although a fluctuation on the standby voltage was due to the led's flashing in time with the flucuation.
it was hit and miss knowing what voltage goes where,it is a vestal afterall!things seemed fine as a guestamite.
i decided to do component testing in the area of the inverter,from the smpt there are 2 ultra fast recovery diodes in parallel .
floating my scope probe over the smpt was showing a waveform,this indicated to me that there is life there.
i carried through checks on these diodes and found a shorted diode,(in circuit),removed from circuit and tested the same,(d105)a uf5402,upon scabbing through my junk bin,i found one of the same spec,installed,
the result.
she fired right up,full backlights,menus the lot.
on soak now just to check she dont cough,so far so good.
another saved from costly landfill!
power supply 17ips10-3 v.1,mainboard 17mb45m-2
the power supply has intergrated inverter bit of a pain,no markings for voltages etc,also used in bush,sylvania etc,it has a touch panel on the side for the usual adjustments ,.
these NORMALLY suffer with the inverter output ceramic caps (3kv),on c231 &c230,an insulation test confirmed they were fine,and capacitance was within tolerance,all other lytic caps tested for esr returned good results.
i had all stable voltages ,but no voltage in inverter section??although a fluctuation on the standby voltage was due to the led's flashing in time with the flucuation.
it was hit and miss knowing what voltage goes where,it is a vestal afterall!things seemed fine as a guestamite.
i decided to do component testing in the area of the inverter,from the smpt there are 2 ultra fast recovery diodes in parallel .
floating my scope probe over the smpt was showing a waveform,this indicated to me that there is life there.
i carried through checks on these diodes and found a shorted diode,(in circuit),removed from circuit and tested the same,(d105)a uf5402,upon scabbing through my junk bin,i found one of the same spec,installed,
the result.
she fired right up,full backlights,menus the lot.
on soak now just to check she dont cough,so far so good.
another saved from costly landfill!
funny enough i tracked it down with an old analogue meter set to x10k cost be around £20 for the 2,as my fluke was in work,a good way to check for breakdown is to use 2 meters in series,which gives you a higher output voltage at the probes.
.......,ever heard the saying"you have a black cat,i have a black panther"?..rings true dont it
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