Mulja tv repair portal
Equipment Repairs => LCD TV forum => Topic started by: cheeky2 on August 20, 2016,05:52:53
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I have this Samsung BN44-00438C REV:1.1 power supply that has shorted Mosfet QP801 a couple of times.
Initially just replaced mosfet however it has since gone again so suspect the fan ic however i cannot identify the number properly it could be a fan 7530 or a fan 7930 (ICP801)? Does anyone know which one it is please as I cannot rely on the schematic giving the right details as some of the component values are different from the one on the psu board! I will also be checking the surrounding components for any issues
Please reply if you know for certain which one it is! Thanks
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Replace RP-802 (470KR) and CP-803
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Thanks Jordan,
However I suspect that the psu solution is only suitable for a BN44-00438B or an A version as I have spent around 45 minutes searching for the RP-802 470K smd resistor without any success in finding it on the pcb. The only schematic I managed to find wasn't relevant to the BN44-00438C power supply!
I have attached the schematic I found which I believe is relevant to the two components you pinpointed in checking.
If anyone has a BN44-00438C schematic they could upload that would be great?
Just found a link from a Bulgarian site that suggests it's a FAN7930
https://www.ksp-electronics.com/en/product/view/22238-power-supply-i2632f1-bdy-rev-1-1-bn44-00438c
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Ok update the resistor RP-802 was a 4.7 ohm marked as 4r70 which was around 300ohms which was replaced which was just by the blown Mosfet! How I missed it I don't know. I am not sure on the value of the capacitor CP-803 but will have a look at similar psus using this fan7920 ic for a rough guide as to its value.
Hopefully this should have it working, though the original TV it came from has been sold so cannot fully test it.
Hopefully this may aide anyone else with similar issues.