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Don't waste your time, if possible take it back to your nearest Maplin with receipt and ask for a replacement or email ask for return item number and or request replacement or refund post back obtaining proof of posting.
Good day sir/maam, Hi, If the LCD is under warranty, use it, they will replace the LCD monitor for free. If not, you may need spend for a Power supply board, to repair one.
There are two boards usually found on an LCD monitor, one main board that controls the LCD screen, back light, inverter, controls and sound. the second board is the power supply board, which accepts mains voltages 90v-240v AC and convert them to DC to power the entire monitor.
If however you may bring it to a repair shop or dealer, they will replace the power board, and there you go. the monitor is done.
The cathode heater is often supplied with a filtered DC voltage of 6-12 volts.
Often, there is a capacitor on a board plugged directly on the base of the CRT and if this fails, its capacitance becomes unstable and insufficient to adequately filter the voltage and supply clean DC.
In some monitors, the capacitor may be on the main board instead of the base of the CRT.
A technician should locate (not difficult) the CRT heater pins if not marked, and determine where the filter capacitor is located, measure it for capacitance and replace it if needed.
The value is normally many times what is required to clean up the DC but this type of part can (and will) break down chemically and its value will shrink to a very small value while its losses climb.
Eventually, this results in the effect you describe.
Sounds as if your monitor's board is burnt out. I think its time for you to invest in a new one. You can recycle your old monitor for parts. Donate it to an E-Waste recyclers because you don't want that lead in the landfills.