need help with backlights T20s - GSM-Forum

SVH · 07-22-2003, 18:14

backlights dont work
keyboard/backlights layer is ok
i measured voltage between half-round contacts - generaly nothing
but between ground and any of contacts is about 0,6v
voltage suppliyng from small chip (is it driver?) near the charging components
is it driver fault? or can i check this?
thanx
br

mandu · 07-22-2003, 20:53

first change light pad , if same problem change N750 (small ic )

ARS · 07-23-2003, 02:16

ELF .... backlight of T20, T28...etc are using high voltage and high frequencies.....hard to measure....change the ELF, or try to change driver... 8 legs IC near chargin circuit...but in most cases is problem just coil...

07-22-2003, 18:14	#1 (permalink)
SVH No Life Poster Join Date: Mar 2002 Location: Europe, Lemberstadt Age: 53 Posts: 2,311 Member: 9889 Status: Offline Thanks Meter: 50	need help with backlights T20s backlights dont work keyboard/backlights layer is ok i measured voltage between half-round contacts - generaly nothing but between ground and any of contacts is about 0,6v voltage suppliyng from small chip (is it driver?) near the charging components is it driver fault? or can i check this? thanx br

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07-22-2003, 20:53	#2 (permalink)
mandu Freak Poster Join Date: Oct 2002 Location: INDIA Posts: 292 Member: 17243 Status: Offline Thanks Meter: 13	first change light pad , if same problem change N750 (small ic )

07-23-2003, 02:16	#3 (permalink)
ARS No Life Poster Join Date: Dec 2000 Location: Slovakia, Brezno Posts: 980 Member: 2721 Status: Offline Thanks Meter: 23	ELF .... backlight of T20, T28...etc are using high voltage and high frequencies.....hard to measure....change the ELF, or try to change driver... 8 legs IC near chargin circuit...but in most cases is problem just coil...