Hi,
My old LG L1750s stopped working some time ago: it doesn't turn on anymore (even the power LED) and only emits a noise that I'll explain in a moment.
I oppened it to try to figure out the problem, but I didn't found any bad capacitor or something "strange" visible. Even so, I started to follow the steps done in this thread, but changing the capacitors didn't solved my problem.
But I observed something unusual: when plugged, the monitor emits a clicking noise that stops for a little time if I disconnect the mainboard from the PSU. Along with that, the output voltage of the pins in CW201 decreases a lot when the mainboard is plugged again: from ~4.9V to ~2.3V and from ~13V to ~7.5V.
Some data:
- C101 working normaly;
- jumping pins 1 and 5 in U101 shows normal behavor;
- changed 7 capacitors: C206, C202, C204, C205, C203, C105 and C103;
- some pins in CW201 have ~4.8V and others ~13V (unplugged mainboard);
- I couldn't identify which component is emitting the noise;
- PSU model: AIP-0108 REV:02 (Lien Chang)
Thoughts on where to continue?
My old LG L1750s stopped working some time ago: it doesn't turn on anymore (even the power LED) and only emits a noise that I'll explain in a moment.
I oppened it to try to figure out the problem, but I didn't found any bad capacitor or something "strange" visible. Even so, I started to follow the steps done in this thread, but changing the capacitors didn't solved my problem.
But I observed something unusual: when plugged, the monitor emits a clicking noise that stops for a little time if I disconnect the mainboard from the PSU. Along with that, the output voltage of the pins in CW201 decreases a lot when the mainboard is plugged again: from ~4.9V to ~2.3V and from ~13V to ~7.5V.
Some data:
- C101 working normaly;
- jumping pins 1 and 5 in U101 shows normal behavor;
- changed 7 capacitors: C206, C202, C204, C205, C203, C105 and C103;
- some pins in CW201 have ~4.8V and others ~13V (unplugged mainboard);
- I couldn't identify which component is emitting the noise;
- PSU model: AIP-0108 REV:02 (Lien Chang)
Thoughts on where to continue?
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