Heidi ya best bet is Abbot Electronics on Bebington rd (top of Victoria park, next to B.I cycles bike shop, Family have been taking telly's there for years, great fella, very honest, reasonable priced and will give ya a free quote. He will give ya a rough quote over the phone if you describe the problem enough for him to get an idea what it could be. 0151-645-0616
Used this place a few times myself, very reasonable and open.
Even fitted parts that I'd bought from eBay