Philips 22PFL3504D Power Transformer Replacement

Введение

The most common issue with humming, and intermittent failure to come on, is a failed transformer. The part number for the transformer is LTT2PC0XB044. The least expensive one I found was $11. This set opens up without any difficulties, the layout of the PCB's is clean and neat. Philips was kind enough, to mark the screws that need to be removed, with an arrow on the circuit board.

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Шаг 1 Power Transformer

Philips 22PFL3504D Power Transformer Replacement, Power Transformer: шаг 1, изображение 1 из 3

Philips 22PFL3504D Power Transformer Replacement, Power Transformer: шаг 1, изображение 2 из 3

Philips 22PFL3504D Power Transformer Replacement, Power Transformer: шаг 1, изображение 3 из 3

Here is the Philips 22PFL3504D. Fingerprints are definitely visible on the glossy front bezel and the LCD. those are really just smudges.
Turn the TV over and lay it down,
this will show the four Philips head screws that hold the base on to the TV

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Шаг 2

Philips 22PFL3504D Power Transformer Replacement: шаг 2, изображение 3 из 3

With the four M3X15 mm screws removed, the base can be taken off.
Remove the three Philips head screws on the right side
Remove the three Philips head screws on the left side.

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Шаг 3

Philips 22PFL3504D Power Transformer Replacement: шаг 3, изображение 3 из 3

Remove the two Philips head screws on the bottom
The back cover can now be removed by simply lifting it up.
Here is a view of the layout of this TV. Clean and tidy with only a few ribbon cables.

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Шаг 4

Philips 22PFL3504D Power Transformer Replacement: шаг 4, изображение 3 из 3

Remove the three CCFL connectors
Remove the top flat ribbon cable. it is a simple press fit and just needs to be pulled out.
remove the two and flat ribbon cables from the video board,
as well as the ribbon cable from the interface board.

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Шаг 5

Philips 22PFL3504D Power Transformer Replacement: шаг 5, изображение 3 из 3

Remove the power button cable. It is a eight pin connetor and needs to be pulled up
Remove the twelve M3x6mm Philips head screws
Remove the board from the TV
this is the transformer that needs to be replaced.

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Шаг 6

Philips 22PFL3504D Power Transformer Replacement: шаг 6, изображение 3 из 3

Turn the board over so that the solder points are up. Identify the connections for the transformer
Use some flux on the desolder wick and desolder the contacts.
The wick leaves the contacts without any solder, which will help to easily remove the transformer.

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Шаг 7

Philips 22PFL3504D Power Transformer Replacement: шаг 7, изображение 3 из 3

Turn the board component side up and remove the transformer
Here is the board with the transformer removed.
Always make sure the the replacement parts are identical in size and contacts. I like to compare the old (right) to the new (left)

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Шаг 8

Philips 22PFL3504D Power Transformer Replacement: шаг 8, изображение 3 из 3

Insert the new transformer gently through the holes on the board.
Turn the logic board component side down, identify the transformer contacts. Apply some flux to the contacts.
Solder the new transformer in place. The brownish residue is from the flux. The board can be cleaned with isopropyl alcohol after the solder repair.

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Шаг 9

Ensure the all connections have been soldered and no accidental solder bridge was created. If it all looks satisfactory, reassemble the TV
After the repair and reassembly. hopefully this is what you will see. A perfect picture and no disturbing humming

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