Repairing LG 17LX1R LCD Television Power board
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Here is a decent 17" television that doubles as a PC monitor. According to the previous owner, it did not come on again after a thunderstorm. It is out of production and deemed an obsolete model.
- Author: oldturkey03
- Time required: 1 1/2 to 2 hours
- Difficulty: Moderate
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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 $80...
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Step 2
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Here again are the four screws to be removed from the stand.
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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.
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This is the view with the back off. Time to remove the metal shield. It is fastened with six Phillips screws.
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Step 4
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After the shield is removed, the power board as well as the main board are immediately visible.
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Power Board
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Main Board
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Fuse
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Check all capacitors for blown tops and/or leakage.
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Here is the importance of a good visual inspection. Brown discoloration around Diode D102 is good evidence of a short circuit, possible blown component.
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Disconnect all connectors from the power board
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Remove the four screws that mount the power board to the chassis.
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Step 6
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Here is the unsoldered diode. description on the diode reads LT526 IN4007. Arranged to purchase at $0.29 per diode.
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Solder the new diode onto the power board. Use a pair of tweezers or hemostat to hold the diode in place while soldering.
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Diode replaced, clean the board with isopropyl alcohol to get rid of any debris or old flux.
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