07-02-2017 01:22 PM - edited 07-02-2017 01:28 PM
Brief history: Vertical artifacts on LCD. Checked if cables are seated behind LCD but forgot battery in. Backlight no longer worked.
I've opened up and tested all the fuses I could see for continuity. The only blown one I could find was F1. Does anyone know its value or typical LED backlight fuse ratings? I would rather replace it than short it.
The board is an 04Y2040 i7-3520M
Tested fuses and status: (✗=no continuity)(?=fuse not found)(✓=continuity)
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07-03-2017 10:26 AM
They are usually 3 amps, 32 volts. Is there a letter stamped on the fuse? They are normally made by Littelfuse and the letter is the key for determining the rating. These are fast-burn and come in various sizes (based on length)
07-05-2017 09:05 AM
P is 3 amps.
They have changed the designations and use some collection of lines, dots, etc., rather than letters.
I have not bought them for a while. The newer machines are less likely to blow them out. In the U.S., I have gotten them from Mouser Electronics. I am not sure about the physical size. The T230 series might use types 434 or 435. The last time I bought them, I got several and I may never need more. There is a second fuse that often blows at the same time. It is a 0.5 amp fuse ("F" designation). It controls the little status LEDs on the screen (all except bluetooth). If your status lights are also out, you may need that also. It is often near the LCD connector. See this:
07-14-2017 01:50 PM
solder the new fuse on the top of the old one