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techwood twp4210 no picture bo sound?

Techwood plasma screen with separate tuner model no.twp4210, when switched on the red light comes but there is no picture no sound,
Can anyone help me locate the fault or what parts need changing.
Anj, July 2008
almost same prob here no picture, but sound ok..tried resetting box, changed the lvs lead, but still no picture

george w, December 2008
DID THE RED COLOUR NOT CHANGE WHEN YOU PUSH THE STAND BY?

TONTON CARLOS, November 2008
Hard reset the media box, unplug from mains, remove the lid, on the inside of the box, you will see two main boards, one is the psu (front) , the other is the mainboard (towards the rear of the box), towards the front of the mainboard you will find two plugs, pl625 and pl626, unplug both these plugs, then plug the media box back into the mains and switch on, you should have a red light on, then unplug from mains, replace the two plugs into the mainboard, replace the lid, and plug back into the mains, power up, now the box should work ok, if it does not, then the fault lies with the lvds lead that connects the box to the panel, dont forget that the infra red receiver for the remote is in the panel, so you must have the lvds lead connected properly for it to work ok, a hard reset usally cures most problems on the av box. Please do not attempt to do this if you are not fully confident with electrical equipment, and read carefully the instructions i have given, do not place hand in box whilst it is plugged into the mains at all.

idc1966, September 2008