A co-worker gifted me with a broken Viewsonic VP201 LCD display. The power light was green, but nothing appeared on the display. A google search using its model number and "repair" brought me to the badcaps forum thread 95163.
Upon disassembly I found 1 bulging 680 uF 25V cap and an open F2 fuse. I measured 17.75V from the power supply.
I ordered a complete cap set and fuses from Mouser.
Last night I replaced both 680 uF caps (Ltec), and the 150 uF 400V (Taicon) high side cap, as they were the only ones with China/Taiwan origin. I left the Nichicon 22 uF and 47 uF's alone, mostly because I didn't feel like digging them out of the white adhesive goop. Then I replaced the fuse - my first surface mount PCB repair.
I reinstalled the power supply board, inverter board, and the inverter shield then applied power to the panel. The "No signal" icons appeared - the first sign of success! PSU output voltage was still 17.75V. I reinstalled the main board and power supply shield, then buttoned up the case. Connecting it to the computer confirmed its successful resurrection from the dead.
Some Mouser part #'s for your convenience:
576-0466002.NR 63V 2A Littlefuse
647-UPZ2G151MHD6 400V 150 uF Nichicon aluminum electrolytic cap
667-EEU-FR1E681 25VDC 680 uF Panasonic aluminum electrolytic cap
Thank you, badcappers Wrog and PlainBill, for making this an easy fix.
Jon
Upon disassembly I found 1 bulging 680 uF 25V cap and an open F2 fuse. I measured 17.75V from the power supply.
I ordered a complete cap set and fuses from Mouser.
Last night I replaced both 680 uF caps (Ltec), and the 150 uF 400V (Taicon) high side cap, as they were the only ones with China/Taiwan origin. I left the Nichicon 22 uF and 47 uF's alone, mostly because I didn't feel like digging them out of the white adhesive goop. Then I replaced the fuse - my first surface mount PCB repair.
I reinstalled the power supply board, inverter board, and the inverter shield then applied power to the panel. The "No signal" icons appeared - the first sign of success! PSU output voltage was still 17.75V. I reinstalled the main board and power supply shield, then buttoned up the case. Connecting it to the computer confirmed its successful resurrection from the dead.
Some Mouser part #'s for your convenience:
576-0466002.NR 63V 2A Littlefuse
647-UPZ2G151MHD6 400V 150 uF Nichicon aluminum electrolytic cap
667-EEU-FR1E681 25VDC 680 uF Panasonic aluminum electrolytic cap
Thank you, badcappers Wrog and PlainBill, for making this an easy fix.
Jon
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