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How to open Service mode?

I have Philips T.V. modle - 21PT3326/V7 ZY. I want to adjust picture hight. How can I open service mode.

这是一个好问题吗？

是否

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Stand-by problem

More information is needed from you to help you try and fix it.

What is the make and model number of the TV?

What is the problem when it is in standby e.g. no standby light, won't turn on using remote or TV controls? What?

philips v7 a2 service menu off tv

Philips Television