Re: Samsung Syncmaster 940BX backlight problem - Need help please.
Never mind
I see there on the aution now.
I couldn't find them on E Bay when I wanted one last year.
hotdig
Member
Last Activity: 10-19-2015, 12:02 PM
Joined: 10-26-2009
Location: Adirondacks, New York
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Re: Samsung Syncmaster 940BX backlight problem - Need help please.
Urban hiker....
You said in post #36.... "I ordered a replacement from China off the famous auction site"..........you mean Ebay?Leave a comment:
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Re: Samsung Syncmaster 940BX backlight problem - Need help please.
I have the service manual if you need a copy.Leave a comment:
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Re: Benq Inverter board C5707 Transistors
An interesting article on the Benq C5707 transistor problems.
[url]http://www.electronicrepairguide.com/benq-t705-lcd-monitor-repair.html[/url]Re: Benq Inverter board C5707 Transi...air.html[/url]Leave a comment:
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Re: Samsung Syncmaster 940BX backlight problem - Need help please.
PlainBill or Kc8adu
I have pulled the transformer and remeasured from A2B and C2D again
My measures are:
A2B= 1.275
C2D= 1.310
Can you confirm if you still think the trans is bad?
Any other measurements I can do on the trans now that it is out or maybe check some points in the circuit while the trans is out?
Thank you...Leave a comment:
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Re: Samsung Syncmaster 940BX backlight problem - Need help please.
Hey Magistertc
I measured it and it's very strange. As I have said before, the lamps come on very briefly upon power on.......then.....off....then after about 15 or 16 secs...they cycle on again very briefly. Then nothing.
What's strange is...when the lamps first cycle on, I measure 1.55V then it shifts to 3.65V upon turning off. When they cycle on again, it drops back to 1.55V then goes to 3.65V again upon shutdown of lamps.
I'm stumped. Anything else you can point me...Leave a comment:
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Re: Samsung Syncmaster 940BX backlight problem - Need help please.
Hey Plainbill....thanks for responding. I was hoping you would help me out. I've read a heck of a lot of your posts and responses. I'm very impressed with your knowledge along with many others in here.
Onward
To your answer above....The one set is not working. I plugged the same known good lamp into each individual socket. Each socket on the good set would fire the lamp breifly. Neither of the sockets on the one I have marked bad would fire the lamp.
Measurements asked...Leave a comment:
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Re: Samsung Syncmaster 940BX backlight problem - Need help please.
Another observation about this situation.
The digital/analog comes on for about 2 secs then goes blank but I can still see it with flashlight. It then cycles to the no input signal box for 2 seconds then blank. The box is still visable with flashlight.
That's all the info I have at this point.
Thanks again for you comments on this.Leave a comment:
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Re: Samsung Syncmaster 940BX backlight problem - Need help please.
Hey all....I isolated part of the problem..see attached pics
Lamps are good...used substitutes One lamp output is bad..does not light lamp at all
Magistertc
That is a Fan7314.....data sheet attached
I checked the following on that chip
pin 17 = 15.69V Voltage In
pin 6 = 2.49V... ref voltage
pin 5 = grd
Any other tests?
Bobdee
I was afraid you would ask about that...LOL
I have a vga cord on the way...don't have one...Leave a comment:
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Re: Samsung Syncmaster 940BX backlight problem - Need help please.
Pic of the back of inverter board attached....Leave a comment:
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Samsung Syncmaster 940BX backlight problem - Need help please.
Hello all and first off, thank everyone for the wealth of information within this forum. Your help to people like me is very much appreciated. After reading this forum daily for the past few weeks I decided to make the plunge into repairing my Samsung Syncmaster 940BX.
monitor status...With monitor on, no vga cable hooked to computer, have blue power light. This does not change at all.
The problem...."Digital" box appears on screen for 1 or 2 seconds, disappears and then the "no cable attached" box appears and starts to move up screen. Then the...Last edited by hotdig; 11-20-2009, 04:28 PM.
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