ajp 5600p laptop charger power supply advice

chiefs

I need some advice please, from anyone who knows aboput laptops etc

my laptop charger went dead, below is the brief description of the power supply

model@ EA11203
AC INPUT 100-240V - 50-60HZ
OUTPUT 20V - 6.0AMP

NEW REPLACED ONE IS BELOW (output is lower than the old one)

model@ LSE0202A1990
INPUT 100-240V - 50-60HZ
OUTPUT 19V 4.7AMP 90W MAX

what happened was when i used this new power supply, it didnt work as the power supply light went off as soon as i pluegs into the laptop, so what i found out was it has built in power cut off switch inside,

so i opened the old power supply unit and, i took the cable from there and replaced it on the new power supply, and this works fine now, What i wana know is will, the power pack ever blow up, cos it does get warm. bearing in mind, that the new power supply voltage are lower than the orginal power pack.

thanks i hope to hear from some experts, their view

thanks