Samsung PS42A457

The Samsung BN44-00204A power supply from a PS42A457 Plasma TV

The Samsung BN44-00204A power supply

A PS42A457 Plasma TV. Stuck in standby would be a better description and once again, the customer wasn’t really sure if it would be worth repairing. The standby light was on but there was none of the normal clicking from the power supply relays and no response to the remote or front controls.

Due to the lack of relay activity this was probably, but not certainly, a power supply problem. What the relays do is feed the AC to the bridge rectifier, there is a low voltage rectified supply taken from the AC input which runs the standby power supply, which in turn provides a constant voltage to the microprocessor on the main panel, allowing the TV to be taken out of standby.

The problem was in this small power supply circuit and was very cheap and easy to repair, putting the customers worst fears to rest.

It scares me, the amount of very good quality, repairable TV’s that end up in the skip, and that are then replaced with the new generation of very poor quality TV’s from places like Argos!