[ltp] Power Adaptor for ThinkPad T530

[Tim Evans]

I've owned two Lenovo T-series laptops over the last 15+ years, a T61 
and now a T530.  I've had to replace the power adaptor for both of them, 
and now it appears the T530 replacement is failing.

Both models' adaptors failed in the same way.  The connector to the back 
of the laptop loses is connection and the machine switches to battery 
power (with an audible click).  Jiggling the connector will bring the 
machine back to connection to supply.  Rinse and repeat.  The longer 
this goes on, the more jiggling it takes to get a connection.

Current part number is ADLX90NCT2A; this is the one with the round 
connector tip.  Searching for this part number on Lenovo's site yields 
no results.  The only round-tip adaptors that turn up are a 45-watt 
model (ADLX90NCT2A, $17) and a 65-watt model (4X21K07718, $53). Don't 
find any 90-watt models. Can you use either of these smaller ones on the 
T530?

I've found pre-owned/refurbished ADLX90NCT2A adaptor on eBay for 
$10-$15.  Before I order one, what is the yellow USB connector on the 
back, right-hand side (viewing from front) of the T530? Is it an 
alternative power adaptor connector? If so, is there a power adaptor 
with the appropriate USB connector?

Any suggestions other than ordering a replacement?  Thanks.