Thinkpads Forum

Was using one of my T460 Thinkpads (20FNCTO1WW) the other day, heard a "tink" sound and the screen went black. Plugged into an external monitor via HDMI toggled to ext screen and had a normal image displayed. With the ext screen enabled I couldn't see if the LCD panel was active or not.

Guessing (hoping) the backlight fuse has blown. But I am having identifying the fuses on this Rev 3 Motherboard.
From the schematics I have, it appears that it could be F3, F7 or F5. But the printed numbering on this board uses both F and PF prefixes for the fuses. I have checked all the fuses close to the LCD connector (J10) and the camera / mic connector (J11) but haven't found a dead one yet. And there are some fuses shown on the LCD connector schematic that I cannot locate.

Before I disasemble the screen (FHD Touch), can anyone confirm if these LCD panels also have fuses?
Or offer a suggestion on the correct main board fuse numbers and location to check ?


many thanks

Most Thinkpad backlight fuses are 3A/32V/Fast, such as the ERBRD3R00X at F3 and F7 on your T460 schematics.
If those 2 are OK, your problem is elsewhere.
I have never swapped fuses on an LCD in over 20 years.

Thank you for the reply RealBlackStuff.
F3 & F7 test OK so I am looking elsewhere.
Will pull the panel out later this week and take a look.
The PF3 & PF7 fuses tracked back to Batt & Pwr management ....but an interesting rabbit hole.

cheers

Just to close this out....
No fuses blown, the panel was dead.
Have removed the screen completely and converted this T460 to a headless machine with VNC.
Could have replaced the screen but I can buy a refurbed unit for a few $ more (and I have too many Thinkpads already

thank you RealBlackStuff