Dead & noisy Liteon charger
hi fellas,
I've recently been given a supposedly faulty laptop by a friend. In fact it was the PSU that was malfunctioning.
It's the first time I crack open one of those "power brick" and I was amazed by how "packed" everything was. Furthermore, the added isolant/glue whitish thing really doesn't help figuring out the PCB's layout.
LITEON 19V - 4.74A
MODEL: PA-1900-03
It makes a weird beeping sound when connected to AC.
- Main cap reads 320V,
- the 3 tiny ones near the main cap read 10V
- the 2 green caps on the right, i got 0 on my DMM, I think that the current isn't even going up to there (they seem to charge with current when I set my DMM to diode tester and then quickly set it to 20 DC to read voltage)
- the fuse near the power plug is ok (0.5Ω)
- secondary (or is it "primary"?) winding keeps changing value from 0 to 0.3V
Here is a youtube video of the said noise: http://www.youtube.com/watch?v=CMyPDSPI20k
Could you please tell me what I should do next?
I've recently been given a supposedly faulty laptop by a friend. In fact it was the PSU that was malfunctioning.
It's the first time I crack open one of those "power brick" and I was amazed by how "packed" everything was. Furthermore, the added isolant/glue whitish thing really doesn't help figuring out the PCB's layout.
LITEON 19V - 4.74A
MODEL: PA-1900-03
It makes a weird beeping sound when connected to AC.
- Main cap reads 320V,
- the 3 tiny ones near the main cap read 10V
- the 2 green caps on the right, i got 0 on my DMM, I think that the current isn't even going up to there (they seem to charge with current when I set my DMM to diode tester and then quickly set it to 20 DC to read voltage)
- the fuse near the power plug is ok (0.5Ω)
- secondary (or is it "primary"?) winding keeps changing value from 0 to 0.3V
Here is a youtube video of the said noise: http://www.youtube.com/watch?v=CMyPDSPI20k
Could you please tell me what I should do next?
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