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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
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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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.
After the shield is removed, the power board as well as the main board are immediately visible.
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.
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.
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