I didn't mean to sound rude, but since you didn't mention if it was new or previously used, I thought I'd better ask about the battery.
The B+ voltage itself on a CRT TV isn't usually a particularly high voltage and the DMM should have been able to handle it, I would think. Most likely, it got a zap of HV from the flyback transformer. In that case, it is probably dead.
If I were you, I wouldn't waste further time trying to fix it. It's a relatively cheap meter. I'd just replace it, personally.
Edit: I just re-checked the manual, and on the DCV ranges it should be able to handle 1000VDC. Even if you had it set on the wrong range, below 200VDC, it should have just displayed an over-range symbol, so HV almost certainly killed it. You could look for burned components as suggested by shrtrnd, but aside from that I'd recommend that you simply replace it as I suggested earlier. Sorry I can't be of further help.
