Pi boot anomally. - Raspberry Pi Forums

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pi boot anomally.

bi stable boot behavior appears correlated ac line voltage not voltage between test points 1 & 2.

1 normal boot displays splash, raspberry (recovery option), monitor enters power save, boot text on screen in ~9

sec ~122vac.

2 non boot displays splash, raspberry (recovery option), monitor enters power save , stays there ~118vac.

turns out behavior not appear correlated voltage between test points tp1 , tp2.

tested 2a psu lowes started (11:45am june 28) @ line 122vac runs fine @ 118 vac 4.79vdc tp1-

tp2. fails restart @ 119vac (behavior 2)(12:40am).

tested verizon 2.1v psu 5.03vdc tp1-tp2 still behavior 2 @ 118 vac. started @ 120vac verizon psu

giving behavior 1.

because verizon psu provides higher voltage lowes psu seem monitor

behavior responding line voltage fluctuations. pi never has trouble waking monitor

splash or changing raspberry icon , reminder hold shift key recover. problem

transition text mode dell e228wfpc monitor share generic pc cable

swapping.

as say, tp1-tp2 seems fine, , problem monitor.
monitor on edge regarding hdmi signal level?

http://elinux.org/rpi_config.txt
"config_hdmi_boost configure signal strength of hdmi interface. default 0. try 4 if have interference issues hdmi. 7 maximum"


raspberrypi



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