iMac black screen death after everything. All 3 led diagnostics on
crwdns2934249:0crwdne2934249:0:
I have '''21.5” iMac late 2009 model 1311'''. When I bought it it was with incomplete os installed till disk utility.
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1 Internal display Was work [br]
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1 Internal display Was work Ped
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2 external display was work
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2 external display was worked
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3 usb bootable
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3 usb bootable worked
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4 Half installed OS X till finalise setting screen
but facing 3 problems
'''1 dead pram battery'''
'''2 late start button response'''
'''3 Mac hdd show multiple error''' message while OS X installation.
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after replacing same model number pram battery.
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[br]
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After replacing same model number pram battery.
1 Display stop working. Internal & external.
2 usb bootable stop working.
3 I replaced new display lcd cable, pram battery & vertice synchronised cable.
4 mac hdd showing multiple errors that is why I make partition through trans MAC software through windows. [br]
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5 tried new hdd also with clone method and bootable usb method.
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5 tried new hdd also [br]
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6 all 3led Diagnostic light working.
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6 try prm reset, safe mode, options to boot, bootable, external display, another Mac OS clone via usb hdd, f1 f2 brightness, heat sink for processor & graphic card, almost everything.
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checked every cable. Confused about lvds cable face orientation but tried all possible directions.
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7 try prm reset, safe mode, options to boot, bootable, external display, another Mac OS clone via usb hdd, f1 f2 brightness, heat sink for processor & graphic card, almost everything.
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8.replace broken old vertical syn flex cable also.
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9 checked Lvds housing port.
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10 Checked psu volatge
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11 Try hdd thermal port for lcd panel
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12 LCD lvd power supply voltage
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13 Power cable checked.
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14 use signal 2gb ram
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[br]
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'''If showing all 3 led all means everything working fine why not at lest external display work. Is this model has removable graphic card'''
'''current stage'''
1 Imac work
2 start sound & chimp sound work
3 fan work
3 led diagnostic light work
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4 No display
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4 No display internal external
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5 With & without iMac start with chimps sound, start sound, led 3 on-board lights
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6 Broken thermal lcd socket pin housing at the time bought
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7 Without Hdd it at least show white screen but no [br]
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[br]
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'''Doubts'''
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1 wrong Lvds cable orientation both to logic board and LCD screen.
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2. Same Model New but not allowed to boot.
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3 Problematic HDD
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4 Does new lvds and vertical sync cable create problem.
please help
read almost more than 50 articles & 40 YouTube videos
I have '''21.5” iMac late 2009 model 1311'''. When I bought it it was with incomplete os installed till disk utility.
1 Internal display Was work [br]
2 external display was work
3 usb bootable
but facing 3 problems
'''1 dead pram battery'''
'''2 late start button response'''
'''3 Mac hdd show multiple error''' message while OS X installation.
after replacing same model number pram battery.
1 Display stop working. Internal & external.
2 usb bootable stop working.
3 I replaced new display lcd cable, pram battery & vertice synchronised cable.
4 mac hdd showing multiple errors that is why I make partition through trans MAC software through windows. [br]
5 tried new hdd also [br]
6 try prm reset, safe mode, options to boot, bootable, external display, another Mac OS clone via usb hdd, f1 f2 brightness, heat sink for processor & graphic card, almost everything.
'''current stage'''
1 Imac work
2 start sound & chimp sound work
3 fan work
3 led diagnostic light work
4 No display
please help
read almost more than 50 articles & 40 YouTube videos