Thanks for your your support. i found that sub eeprom (24c02) is connected to this ic1203 so i thought this may be the problem.
I measured the regulator and i/p 5.3 v & o/p 3.3 v so it is good, also the voltage at pin 1&2 3.3v and no short with ground. i tried to press the reset button but nothing happened
how can i check ic1203 (61P805) is healthy ??
does it need programing? if yes can it be done by CH341?...
Ashry
Member
Last Activity: 12-25-2024, 08:54 AM
Joined: 08-04-2024
Location: Alexandria
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Dear Sir can you help me with dead main board ( BN41-01587) for Samsung ua40d6400un and power board (BN44-0427A)
i uploaded the flash files from 24c02 (IC 1205) & 24c512 (IC 1401) [ATTACH]n3331956[/ATTACH]
A5 & 3.3 vdc are exist.
thanks in advance.Dear Sir can you help me with dead main board ( BN41-01587) for Samsung ua40d6400un and power board (BN44-0427A)
i uploaded the flash files from 24c02 (IC 1205) & 24c512 (IC 1401) [ATTACH]n3331956[/ATTACH]
A5 & 3.3 vdc are exist.
thanks in advance....Leave a comment:
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Hello
Please I need your help with this mb bn41-01587e
5vdc exist but standby led not light and no action with power button
[ATTACH=JSON]{"data-align":"none","data-size":"small","data-attachmentid":3327832}[/ATTACH]
IC 1401 should be reprogrammed or what?
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3327833}[/ATTACH]Hello
Please I need your help with this mb bn41-01587e
5vdc exist but standby led not light and no...Leave a comment:
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Hello
I have board bn44-00427a with 12v DC not generated
Standby voltage is ok.
IC 25600 which is responsible for drive transformer for 12 v and led not work.
I disconnect the over current protection pin. Then the power 12 v only keep restarting.
Anyone can help?
1- How to check transformer
2- Any thing I miss to checkLeave a comment:
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I have the same thing fluctuate ac and DC but stand by voltage is stable
This case after dead 12v and led voltage
I disconnect the over current protection from ic 25600 so the standby voltage ok but fluctuation problem.
Did you solve the problem ?Leave a comment:
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Thanks [USER="169795"]lotas[/USER]
I attached schematic for another model which describe IC25600 Circuit
[ATTACH]n3325174[/ATTACH]lotasThanks [USER="169795"]lotas[/USER]
I attached schematic for another model which describe IC25600 Circuit
[ATTACH]n3325174[/ATTACH]...Leave a comment:
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Samsung power board bn44-00427A
I have a problem with Samsung power supply board bn44-00427A.(I am testing with main board disconnected so the all voltage shall be generated)
The standby voltage is ok 5.3 vdc
The problem with resonance circuit feeding 13v DC and led driver ic 25600 has vcc 15.5 vdc and no gate output I replaced it with no change. So I think it is a protection feature.
But when I remove the transformer (PD46B2-PM) the ic work and gate out give 6.2 vdc and MOSFETs supply 200 v to transformer terminal . Just put transformer back the same thing happened.
I measured the transformer coils... -
Hello everyone.
My name is Mostafa from Egypt. I'm electrical engineer.
I like to fix electronic boards so that I need help and will give my experience as well.Leave a comment:
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