When entering the service mode:
Turn on the TV, and then select “STANDARD”on the picture adjustment mode.
Turn off the TV (STAND-BY).
Enter the service mode by pressing the remote control keys in the following sequence :
Mute => 1 => 8 => 2 => power.
To select parameter press channel up or channel down.
To change the value press volume up or volume down.
Save and exit press power button.
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Akai PT5598HD CRT TV Service menu (All TV Service Menu Code)
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"Akai PT5598HD CRT TV Service menu"
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Enter Akai PT5598HD CRT TV Service menu mode, Akai PT5598HD CRT TV factory mode Written on February 20, 2015