Re: Samsung Syncmaster 932B
When i measured trafo removed from board one side of secundary was 1kilo ohm and one was 1100 ohm wich was obviusly gone bad...Thanks Retiredcaps for
sugestions...I have gone too deep with understanding of malfunction so i have resoldered all ic-s with good ones but the problem was only in trafo...tnx again
Djadjo
New Member
Last Activity: 01-21-2023, 02:32 PM
Joined: 01-28-2010
Location: Croatia
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Last edited by Djadjo; 02-19-2011, 04:13 AM. -
Re: Samsung Syncmaster 932B
I found out that the trafo went bad...one side is lighting the ccfl..and other dont...and then the feedback sens shuts down the whole inverter...
when i put other but ok trafo...the inverter board works no probl...
looking at ebay the trafo costs around 12usd...and whole inverter board could be found for 20usd....hm
Djadjo...Leave a comment:
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Re: Samsung Syncmaster 932B
its 1030 ohm....
i have tried with another mm...and on friends working inverter board
both values are 1010 ohm
and on mine faulty inverter board are 1030 and 1050 ohm....
will try to change/resolder transformator from working to non working board to see em i geting somewhere
DjadjoLeave a comment:
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Re: Samsung Syncmaster 932B
The caps i used arent low esr...and they are jamicon brand...maybe not good brand? The original caps from the inverter board wasnt low esr either....
Ok ill easy replace caps to low esr...do you think that it will correct fault?
yes to mention i have resolder all posible solder points pins etc...
Ok i know that multimeter test is not good method to try caps...i can try to measure caps on lcr meter...but if a put new esr than its pointless
red and blue point value is blue 1,03 kOhm and red 1,06 kOhm...Last edited by Djadjo; 02-14-2011, 02:05 PM.Leave a comment:
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Re: Samsung Syncmaster 932B
Ok i have the same problem on my 932B panel...the display shows picture and than after one second backlight shuts down...
So i have firstly changed all caps,all new and all are the higher value in voltage..
the ones that was default on the inverter board,all were good...multimeter test
but the problem remains...
I have measured two blue point and red point on the inverter transformator..and both of the point were 1K ohm....so i presume its good
the problem remains...
I have lend from my friend...Leave a comment:
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Re: LCD 19" BENQ T905 problems
repaired the monitor few seconds ago....
mos q812 (9024n) burned when i lit monitor...but it was my fault...after first testing i didnt re-measure c5707 again...so i burned two in total 9024n...and than realize that c5707 died tru first test...
after that it was easy...changed two c5707 and put new 9024n...and monitor works..without any overheating or any problem..
Thanks 2All
DjadjoLeave a comment:
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Re: LCD 19" BENQ T905 problems
sorry, I didnt said exactly what have i desolder...
ok i have desoldered next components : T801,802,803,804..they all have same instrument readings..the c824 c826 have exact values on lcr metar...
i have changed c821 elco (470uF 35V) the coils l801 and 802 apears normal too...I didnt touch annything on input part of the board..(the 220V to the mosfet q601...put him out and measure..and seems ok....
DjadjoLeave a comment:
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Re: LCD 19" BENQ T905 problems
Hi all
After 3 years..my benq also start to show problems...
when it turns on the picture only blinks...and the power on led shuts down..
inverter board model : 48.L1J02.A02
ok so i changed all (c5707) q809 ,q808,q815,q816..
also changed two irf9024n but only one of them have been blown...
ok so i start the monitor and voila the picture is back...but after minute or two...9024n (q812) gets so hot and burns....another (q805) 9024n is normal cold...and dont overheat...Leave a comment:
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