help with 5970 v-card mine BTC but no LTC mining

[danilom]

Hi all

i have a 5970 ATI RADEON vcard that use to BTC mining, no problem, but when i switched to LTC mining this card make the driver crash, im using win 7 with 12.8, i try other drivers but still doesnt mine LTC, change the card for another 5970, and problem solved this another card mine LTC.

Trying to find the issue throught cgminer configuration, disable 1 of the gpu of the 5970 card, and began to mine --scrypt (LTC) at half of khs of course... but after 20minutes card crahs an turn on RED led in the back of the card near to power plugs...

Anyone can help me is there something im missing to test, so the card is ok mining BTC, the problem is when trying to scrypt mining..

Thanks all