I'm converting a 17 inch ELO touchscreen monitor (et1739l-8cwa-3-npb-g) to an LED backlight. The driver board came in a kit with the LED light strips. The two caps on the board appear to be labeled Chang X. I would like the this device to last as long as possible so, I figured I would replace these caps.
The driver board runs on 12V from the monitor power supply.
The cap next to the 6-pin monitor power supply connector is labeled 220uF 35V. It is 8mm in diameter and about 12mm tall. Cap must be oriented horizontally across the board to fit in the monitor's back panel, but there is room for a taller cap if it is horizontal. I found a United Chemi-con KZN series with similar specs (220uF 35V EKZN350ELL221MH15D). Would this be a suitable replacement?
The cap next to the inductor and the LED strip connectors is labeled 22uF 100V. Does this cap really need something with such a high voltage rating? It is 6mm in diameter and 12mm tall. An 8mm diameter would fit, but it would hang off the edge of the board, so I'd like to stick to 6mm if i can. This cap must also be oriented horizontally, and there is room for a taller cap. The only 10000 Hrs @ 105°C cap I could find with similar specs is a Rubycon YXM series 22uF rated for 63V. Unfortunately, the minimum order from Digi-Key is 3000 units. Is there any other cap that would work as a reliable replacement?
Could I replace these Chang caps with polymer caps? I'm willing to pay more if it means better longevity.
The driver board runs on 12V from the monitor power supply.
The cap next to the 6-pin monitor power supply connector is labeled 220uF 35V. It is 8mm in diameter and about 12mm tall. Cap must be oriented horizontally across the board to fit in the monitor's back panel, but there is room for a taller cap if it is horizontal. I found a United Chemi-con KZN series with similar specs (220uF 35V EKZN350ELL221MH15D). Would this be a suitable replacement?
The cap next to the inductor and the LED strip connectors is labeled 22uF 100V. Does this cap really need something with such a high voltage rating? It is 6mm in diameter and 12mm tall. An 8mm diameter would fit, but it would hang off the edge of the board, so I'd like to stick to 6mm if i can. This cap must also be oriented horizontally, and there is room for a taller cap. The only 10000 Hrs @ 105°C cap I could find with similar specs is a Rubycon YXM series 22uF rated for 63V. Unfortunately, the minimum order from Digi-Key is 3000 units. Is there any other cap that would work as a reliable replacement?
Could I replace these Chang caps with polymer caps? I'm willing to pay more if it means better longevity.
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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