Re: Samsung Syncmaster 940BX backlight problem - Need help please.

can't seem to edit my last post (time restriction perhaps as per FAQs!?) so here are some pictures of the burnt area of the above mentioned board...

It looks as though the track is completely knackered, so could someone with more experience tell me where I can bridge a new diode* to? Correct section of schematic attached I believe.

* I think it is a diode as opposed to a fuse as I said above, based on the symbol printed on the board, but does anyone know what type? I can't really see...

Re: Samsung Syncmaster 940BX backlight problem - Need help please.

PlainBill,

Thank you for the detailed help - my apologies for seemingly disappearing for the last month, I'm not one of those 'post then do something else and never reply' kinda guys, honest just had a busy month and not been able to look at the boards. I now have 4 of these (and 4x 932mw tv's!) but have also sourced the transformers and am expecting 6 of them any day now, got them at a vastly reduced rate compared to ebay. I will carry out the test you have advised before doing anything...

Re: Samsung Syncmaster 940BX backlight problem - Need help please.

thanks for the reply PlainBill - would you mind elaborating on your advice, should I measure across the same pins on power-up? also if it's not too long-winded to explain, how would I carry out a ring test?

I have inspected the board closely and can not see any bad points. Caps are fine. I had re-flowed the points of the transformer (on both boards) before coming across this thread, to no avail.

I was hoping I was probably NOT correct, because I've been in touch with the chap mentioned...

Re: Samsung Syncmaster 940BX backlight problem - Need help please.

grrr...just when there seems to be some light at the end of the thread, the responses stop!! hotdig if you're subscribed to this then I hope you can get back to me/us with your findings - did you end up changing the transformer, if so did it do the trick?

I have pulled two boards each from a Samsung 932MW, with the same problem, same transformer.

I've just taken readings with the following results:
A-B = 1.175
C-D = 1.178

Seeing as they are near identical...

Re: Fix for Benq FP737s 17" (Q7T3)



thanks for your reply Bob, however if you look here:
[url]https://www.badcaps.net/forum/showpost.php?p=60862&postcount=165[/url]

...you'll see that I did re-solder the joints but the problem has arisen again - hoping someone can comment on further possible causes.

thanksRe: Fix for Benq FP737s 17" (Q7T3)<b...65[/url]<br />...

Re: Fix for Benq FP737s 17" (Q7T3)

hello all,

i received a call today from the friend whose monitor i fixed a little over a week ago - he gave me the news that after a couple of days usage it has stopped working again with the same problem!! i have said i would look at it again but i don't see much point in replacing the parts again if it's gonna blow again (!)...so i'm hoping for some more help from the experts...

is it likely that i need to put in the extended 'protection' mentioned in this thread, or does only a few days of usage imply other...

Re: Fix for Benq FP737s 17" (Q7T3)

not sure if anyone is even reading this, but i have now replaced the 6 components (3x 5707's, 2x9024's and 3A fuse) and re-soldered the transformer legs. I am happy to report the monitor is working fine...it's going back to it's former-owner rather than my plans for a designer piece lol...i have something else in mind now requiring a smaller lcd

thanks to the contributors of this thread who pointed me in the right direction from their work.

Re: Fix for Benq FP737s 17" (Q7T3)

hello all,

some very interesting reading, i like many others stumbled upon this thread when searching for a fix for the monitor i'm currently looking at. to be precise, a benq fp767-12 (Q7C3).

I've got a couple of hopefully easily answered questions and also some professional advice please...

The symptoms are that when connected the backlight flashes momentarily and a message in a small box in the middle of the screen also appears but it's too quick to make out what it's saying. The blue ring stays...