Repairing LG 17LX1R LCD Television Power board

Here is a decent looking LCD TV/monitor that would no longer turn on. I expected a few capacitors etc. that needed to be replaced. In this case, it was a single diode at the cost of 29cents and a bit of over 1 hour of labor. It also shows the importance of a good visual inspection. A new power board for this TV would have cost somewhere around 100$

Step 1 — Power board 

• Here is the LG 17LX1R that will no longer turn on.
• Remove the cover from the stand by
  • simply pressing down on the two tabs. The cover will come off easily
• Remove the four screws that hold the stand assembly to the chassis.

Step 2 

• Here again are the four screws to be removed from the stand.
• Remove the eight Phillips screws that hold the back to the chassis. Once the screws are removed, the back will simply snap off. No excessive force or tools are needed.
• This is the view with the back off. Time to remove the metal shield. It is fastened with six Phillips screws.

Step 3 

• Remove the two on the left
• Remove the two on the right.
• Remove the two on top.
  • Once the six screws are removed the shield can be lifted away easy.

Step 4 

• After the shield is removed, the power board as well as the main board are immediately visible.
  • Power Board
  • Main Board
  • Fuse
  • Check all capacitors for blown tops and/or leakage.
• Here is the importance of a good visual inspection. Brown discoloration around Diode D102 is good evidence of a short circuit, possible blown component.
• Disconnect all connectors from the power board
  • Remove the four screws that mount the power board to the chassis.

Step 5 

• Chassis with the power board removed
• Discoloration of the back side of the power board points again to a bad diode.
• Unsolder the diode from the power board
  • Replacement diode

Step 6 

• Here is the unsoldered diode. description on the diode reads LT526 IN4007. Arranged to purchase at $0.29 per diode.
• Solder the new diode onto the power board. Use a pair of tweezers or hemostat to hold the diode in place while soldering.
• Diode replaced, clean the board with isopropyl alcohol to get rid of any debris or old flux.