Fix Screen and Firmware: Repairing LG 17LX1R LCD Television Power board

Tuesday, December 31, 2013

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.