URGENT: Warranty Period on Replacement Laptop

Hi!

I just received a replacement because my I1520 started to fail. The problem is that the replacement system has a stuck pixel and it even showed a 1 pixel full vertical line for a few seconds.

My CC ended yesterday, I tried with chat support but the rep said he could not help me as there's some issue with my account.

I need to send the old laptop back. Since I'm outside of the US (I live in MX) and can't go there because of my job, my parents will drop it at FedEx for me.

The thing is that I won't be able to call Dell (as I was told through chat) until next saturday. By that time they will already have the old laptop back and chances are that I will end with a defective replacement.

Does anyone knows if there is a warranty period associated with repairs/replacements?

For example: Sony gives you either 90 (or maybe 30, I don't remember) days after a repair or replacement or until your extened warranty ends (they give you the one that last longer).

Is it Dell like this? Even if my CC ended yesterday, am I still covered for a few days more?

I can't find any info on Google.

Should I keep the old laptop until they fix this issue? My uncle used his creditcard to pay my laptop, and I don't want to cause him any trouble because I haven't sent the old laptop back.

Thank you!

Just to let you know...

After several emails Dell agreed to fix my laptop, they said something like they were not obligated to fix it, but that they were going to.

I already have it fixed and is working fine now (apparently).

Several friends told me that according to the USA laws, Dell (and any other company) should cover my laptop for 90 days. That warranty is standard to any repair or replacement, so in case you have a case like mine, don't give up and make them fix the issue.

Cheers!

Actually... I was patient and polite.

I work for a mayor electronics company and I have to tell you: we learn to hate some of our clients...