Meanwhile, Johnson has confirmed that the club have ended their interest in Brighton loanee Liam Dickinson.
The Reds' loanee from Leicester City rattled the Hyde crossbar with a free-kick from the edge of the area.
Borrowdale, 24, joins on emergency terms after the Addicks suffered injuries to Kelly Youga, Grant Basey and loanee Johnnie Jackson.
BBC: Charlton Athletic snap up QPR's Gary Borrowdale on loan
Good work from loanee Freddie Sears earned them a corner and from O'Connor's ball in, Byrne swooped to beat Schmeichel.
Former Canaries loanee Dean Marney had given the hosts a lead on 33 minutes after good work by winger Chris Eagles.
Former Blackpool loanee Carl Dickinson thinks the Tangerines will win on Saturday.
On the recruitment front, Johnson said the club is close to agreeing a deal to keep Wolves loanee Mark Little at London Road.
Only loanee Neil Dexter showed any kind of form, with 46 from 40 balls, and they soon found themselves in trouble on 40-3.
Since returning to full fitness in September, he has been kept out of the side by the impressive form of Chelsea loanee Rhys Taylor.
Two goals each for Bobby Grant and former Crewe loanee Michael Symes did the damage on Friday, with Thordarson left dumbfounded by his team's display.
Against the Cherries, Penney was also able to call upon two other forwards - debutant Michele Di Piedi and pacy Sheffield United loanee Jonathan Forte - from the bench.
As for Millwall's Grimes, his 12 goals so far have had a major impact and surely put his contribution on a par with last season's stand-out loanee, Davide Somma.
North End's equaliser came seven minutes after the restart when Fulham loanee Johnson flicked a Keith Treacy header against the post and the ball went in off McCarthy's back.
Midifielder Robert Snodgrass hopes to win a call-up for Scotland, whose squad is announced on Thursday, for their clash with Wales, while Wolves loanee striker Sam Vokes could play for the Welsh in that match.
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