Repairing LG 17LX1R LCD Television Power board

crwdns2931653:01crwdne2931653:0 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.
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• 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.
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• After the shield is removed, the power board and the main board are visible.
• Power Board
• Main Board
• Fuse
• Check all capacitors for blown tops and/or leakage.
• 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.
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• 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
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• 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.
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• Device powers on and has audio and video after the repair.
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