Repairing LG 17LX1R LCD Television Power board

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Введение

This is a television/PC monitor that did not work after a storm. I expected to replace a few capacitors, but it only needed a single diode at the cost of twenty-nine cents and about an hour of labor. A new power board for this TV would have cost somewhere around $80.

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Шаг 1 Repairing LG 17LX1R LCD Television Power board

Repairing LG 17LX1R LCD Television Power board, Repairing LG 17LX1R LCD Television Power board: шаг 1, изображение 1 из 3

Repairing LG 17LX1R LCD Television Power board, Repairing LG 17LX1R LCD Television Power board: шаг 1, изображение 2 из 3

Repairing LG 17LX1R LCD Television Power board, Repairing LG 17LX1R LCD Television Power board: шаг 1, изображение 3 из 3

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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Шаг 2

Repairing LG 17LX1R LCD Television Power board: шаг 2, изображение 3 из 3

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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Шаг 3

Repairing LG 17LX1R LCD Television Power board: шаг 3, изображение 3 из 3

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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Шаг 4

Repairing LG 17LX1R LCD Television Power board: шаг 4, изображение 3 из 3

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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Шаг 5

Repairing LG 17LX1R LCD Television Power board: шаг 5, изображение 3 из 3

Инструмент, используемый на этом этапе:

Tweezers

$4.99

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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.