hi there,
I am fixing a SAMSUNG le40b530p7w. It has 2/3 lamps which are acting up. This leads to the inverter (bn44-00264c) shutting off entire backlight after several minutes. I ruled out inverter issue - the PFC_OUT voltage is stable 390V, so are 13V & 5.3V. ICs are getting the power etc. When the backlight is shut off, these voltages stay.
I do not want to disable protect feature completely, but rather 'emulate' these fussy CCFLs.
I tried to replace the CCFLs with capacitors - tried 22pf, 47pf, 47*2pf.
unfortunately the backlight goes after a second or two.
How could that be achieved?
BD9893 datasheet: http://dalincom.ru/datasheet/BD9893F.pdf
BN44-00264c: https://archive.org/details/Samsung_BN44-00264C
I am fixing a SAMSUNG le40b530p7w. It has 2/3 lamps which are acting up. This leads to the inverter (bn44-00264c) shutting off entire backlight after several minutes. I ruled out inverter issue - the PFC_OUT voltage is stable 390V, so are 13V & 5.3V. ICs are getting the power etc. When the backlight is shut off, these voltages stay.
I do not want to disable protect feature completely, but rather 'emulate' these fussy CCFLs.
I tried to replace the CCFLs with capacitors - tried 22pf, 47pf, 47*2pf.
unfortunately the backlight goes after a second or two.
How could that be achieved?
BD9893 datasheet: http://dalincom.ru/datasheet/BD9893F.pdf
BN44-00264c: https://archive.org/details/Samsung_BN44-00264C
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