iphone 6 plus backlight ic heating - GSM-Forum

sajidmirza · 07-12-2018, 12:36

Hi iphone 6 plus arrived with tampered backlight section and in dead condition.replaced U1502 and L1503 the phone booted but with half backlight.I checked all the lines and filters.So i replaced the U1502 again ,still half backlight but now the ic is getting very hot.replaced 3 ic's still hot .then switched on without screen and the heat is gone.checked with other known good lcd again its hot.
Is the BL_anode line is problem? No short on any of the backlight circuit and all the resistence values are good.

anyone has the idea where the problem is

tochits · 07-12-2018, 21:46

check C1505 , C1587, C1588, C1106, C1552, C1586, C1597

sajidmirza · 07-13-2018, 10:33

Quote:

Originally Posted by tochits

check C1505 , C1587, C1588, C1106, C1552, C1586, C1597

All the caps have relevant resistance value and no short.

sajidmirza · 07-13-2018, 11:04

UPDATE:

changed D1501 and every thing is ok with full backlight

07-12-2018, 12:36	#1 (permalink)
sajidmirza No Life Poster Join Date: Apr 2006 Location: INDIA Age: 50 Posts: 736 Member: 256461 Status: Offline Sonork: 100.1608049 Thanks Meter: 90	iphone 6 plus backlight ic heating Hi iphone 6 plus arrived with tampered backlight section and in dead condition.replaced U1502 and L1503 the phone booted but with half backlight.I checked all the lines and filters.So i replaced the U1502 again ,still half backlight but now the ic is getting very hot.replaced 3 ic's still hot .then switched on without screen and the heat is gone.checked with other known good lcd again its hot. Is the BL_anode line is problem? No short on any of the backlight circuit and all the resistence values are good. anyone has the idea where the problem is

07-12-2018, 21:46	#2 (permalink)
tochits Freak Poster Join Date: Sep 2008 Location: U.S.A Posts: 382 Member: 856640 Status: Offline Sonork: 100.1606320 Thanks Meter: 281	check C1505 , C1587, C1588, C1106, C1552, C1586, C1597

07-13-2018, 11:04	#4 (permalink)
sajidmirza No Life Poster Join Date: Apr 2006 Location: INDIA Age: 50 Posts: 736 Member: 256461 Status: Offline Sonork: 100.1608049 Thanks Meter: 90	UPDATE: changed D1501 and every thing is ok with full backlight