LG W2252V-PF troubleshooting
My trusty old LG seems to have some issues powering on. Initially the power led did not turn on at all and neither did the backlights. I checked the fuse and i get proper voltage on the large caps.
After resoldering some joints which seemed to have a halo, the monitor light come on, makes the normal "start chime" and the backlights are on. There is no image or OSD though.
The monitor being 11 years old, had one simmilar issue 5 years ago where it would not power on at all and a few caps were replaced by a friend as they were bulging which brought it back to life since.
Cap list on the board:
2x 1000uF/16V Teapo SEK (GP caps) <- replaced previously
1x 1000uF/16V Jenpo CE-WH <- replaced previously
3x 470uF/35V Su'scon SG (Ultra Low ESR, High ripple current)
1x 0.22uF/50V Su'scon
1x 33uF/50V SamYoung NXB
I will probably do a total recap being the board is rather old and the caps (although still not leaking) are crappy brands, will also measure their specs when i remove them.
Any idea what else i should measure to check it's functioning?
Are the 1000uF/16v ones supposed to be GP and not lowESR? I can not find a decent photo of other boards to see the caps or a schematic for this monitor PSU "AIP-0178"
After resoldering some joints which seemed to have a halo, the monitor light come on, makes the normal "start chime" and the backlights are on. There is no image or OSD though.
The monitor being 11 years old, had one simmilar issue 5 years ago where it would not power on at all and a few caps were replaced by a friend as they were bulging which brought it back to life since.
Cap list on the board:
2x 1000uF/16V Teapo SEK (GP caps) <- replaced previously
1x 1000uF/16V Jenpo CE-WH <- replaced previously
3x 470uF/35V Su'scon SG (Ultra Low ESR, High ripple current)
1x 0.22uF/50V Su'scon
1x 33uF/50V SamYoung NXB
I will probably do a total recap being the board is rather old and the caps (although still not leaking) are crappy brands, will also measure their specs when i remove them.
- All diodes are ok
- All resistors are in specs
- No shorts present as the fuse isnt blown
- The 470uF/35V Su'scon SG measured 0.01-0.02 ESR and 467uF so they were not the issue
Any idea what else i should measure to check it's functioning?
Are the 1000uF/16v ones supposed to be GP and not lowESR? I can not find a decent photo of other boards to see the caps or a schematic for this monitor PSU "AIP-0178"
Attached Files
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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