Question about Philips 42PF7320A 42 in. Plasma HDTV
My Philips 42PF7320A/37 has full picture and sound, but also has six equal horizontal bands through the picture. Each band (except the 5th one down) contains 16 horizontal lines that appear to be misplaced from other parts of the picture. Which board should I replace?
To start , ensure that the problem does not depend on sygnal input (from description it does not look this way, but you never know). Test different inputs using different cables.
If the lines are moving, then it is a voltage drop. Since volts is applied at different heights on the plasma panel, a voltage drop can cause colored lines that move across the screen. In this case, a defective voltage regulator, a faulty cable to plasma screen , or a defective sustain board can cause the problem.
If instead the picture has static bands, and they come up always in the same position, scrambling the image, then you may also have a problem on main digital controlled board, where the video signal is generated.
In that case testing will be more complex, and there is need to follow indications on service manual to test the chipsets on board.
Boards that must be tested are Logic main, Y main, ribbon cable to Y main, Y buffers (both), all ribbon cables between this boards.
Also a diagnostic procedure from service menu can help in finding the fault.
See testing diagrams at page 26, and parts location starting at page 7 of service manual below:
Service manual available here.
Posted on Jul 27, 2009
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Posted on Jan 02, 2017
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