Repairing LG 17LX1R LCD Television Power board

This is the LG 17LX1R that will no longer turn on.

Remove the cover from the stand by.

Press down on the two tabs. The cover should come off easily.

Remove the four screws that hold the stand assembly to the chassis.

Remove the four Phillips head screws that attach the stand to the chassis.

Remove the eight Phillips screws that hold the back to the chassis. Once the screws are removed, the back will simply snap off.

Remove the metal shield. It is fastened with six Phillips screws.

After the shield is removed, the power board and the main board are visible.

Power Board

Main Board

Fuse

Thoroughly inspect the boards. Brown discoloration around Diode D102 is evidence of a short circuit, possibly a blown component.

Disconnect all connectors from the power board

Remove the four screws that mount the power board to the chassis.

These are the chassis with the power board removed.

Discoloration of the back side of the power board is a sign of a faulty diode.

Unsolder the diode from the power board.

Replacement diode

Here is the removed diode. Description on the diode reads LT526 IN4007.

Solder the new diode onto the power board. Use a pair of tweezers or hemostat to hold the diode in place while soldering.

Once the diode is replaced, clean the board with isopropyl alcohol to get rid of any debris or old flux.

Device powers on and has audio and video after the repair.