benq fp767 problem 17 inch

[retiredcaps]

Re: benq fp767 problem 17 inch

Green = inverter transformers.
Red = c5707 -> the part number c5707 is written right on the chip
Yellow = fu9024

Normally, we would reference PCB board designations, but your pictures are so poor, it is impossible to read them. If you look at post #12 from PlainBill, he might have listed all the board designations from his own personal notes.

Set your multimeter on 200 ohms. Any reading below 30 ohms suggests a shorted component.

The c5707 and fu9024 can be tested "in circuit". Just test every possible combination of pins for shorts. That is, measure the ohms between pin 1-2, 1-3, and 2-3.

If any of the components are bad, you can order "c5707 kits" on ebay for about $4 to $5 CDN.

[badbowtie]

Re: benq fp767 problem 17 inch

Are the c5705 transistors and fu9024 fets the ones with the heat sinks? There's slight discoloration on the board beneath them. I don't see these ID's marked anywhere on the board. All the transistors are marked with a Q and C for caps at least here in Canada. See pg 61 pic 0107. Also which are the inverter transformers? Sorry about the picture quality, cheap camera = cheap pics. BBT.

[retiredcaps]

Re: benq fp767 problem 17 inch

sorry retiredcaps every site is different. by "crossposting" do you mean posting info in more than one place?

Yes. The identical post showed up in another badcaps.net forum.

Your picofuse is bad. Before you replace the picofuse, you MUST (MANDATORY) resolder all the inverter transformer pins otherwise the picofuse will likely blow again.

The c5707 transistors and fu9024 fets may also be shorted out.

[badbowtie]

Re: benq fp767 problem 17 inch

I desoldered the picofuse, with my multimeter set on 2000 I read 583, with it set on 200 I read 1, or open. BBT

[Rtech]

Re: benq fp767 problem 17 inch

On the first photo,just to the left of the 2 green caps.
Malc

[badbowtie]

Re: benq fp767 problem 17 inch

Anything I can see marked PF either has a jumper or nothing at all. BBT.

[badbowtie]

Re: benq fp767 problem 17 inch

sorry retiredcaps every site is different. by "crossposting" do you mean posting info in more than one place?

[alexanna]

Re: benq fp767 problem 17 inch

If you can't find the fuse please post some pictures that are not blury.WE need to be able to read componet numbers on the board.

[Rtech]

Re: benq fp767 problem 17 inch

If you look on the bottom of the Power supply board,in the area of the 3 aluminium heatsinks, you will see a component identification 'PF' that is the Pico Fuse, probably green in colour to locate it on the top of the board.

[badbowtie]

Re: benq fp767 problem 17 inch

As you can see from 0015 and 0076, I'm a fitter/welder so please bear with me. Photos attached. the pic you were looking at was the guy online with the similar problem with his benQ monitor. thanks, badbowtie.

[retiredcaps]

Re: benq fp767 problem 17 inch

I have basically the same symptoms as GASAN with my benq FP767 17" monitor IE power led is on but no image on screen.

Just so you know cross posting your threads is not going to make people happy here. It confuses people and makes people do double effort. Leave your post in one place (here) and follow the instructions given and people will help.

Problems with Benq style boards are well known here and we can suggest the proper solutions to fix them.

Please don't go down the road as the OP.

[smason]

Re: benq fp767 problem 17 inch

A new lcd monitor is about $100. in Toronto, Ontario, Canada So I'm wondering if I should even proceed as I don't know what the parts will cost me. I do know E=IR, LOL.

Hi Badbow, welcome. The last couple of BENQs I repaired cost about $6.00 Canadian. Sure monitors are cheap, but it's fun to fix 'em and good to keep 'em out of the landfill.

You should measure the transistors, and the pico fuse, and check the soldering on the transformers.

Post a good photo of the board and we'll guide you from there.

[alexanna]

Re: benq fp767 problem 17 inch

Are you able to provide photos of your power supply?
sorry I missed the pitcures I think i can see it but it out of focus

[badbowtie]

Re: benq fp767 problem 17 inch

I have basically the same symptoms as GASAN with my benq FP767 17" monitor IE power led is on but no image on screen. I"ve taken out the circuit boards to check for anything obvious to no avail, the main fuse is good and its the only one that looks like a fuse. I only have grade 9 electronics 32 years ago so please be patient with me. 1st, I think I remember a transistor has to be removed from the board to be tested. 2nd, on your pic on pg 42, where are the picofuses? I don't even know what a picofuse looks like! I thought they would be "fu9024n" but they're marked q743 and q751 and have 3 leads so I'm assuming they're transistors. A new lcd monitor is about $100. in Toronto, Ontario, Canada So I'm wondering if I should even proceed as I don't know what the parts will cost me. I do know E=IR, LOL.

[jetadm123]

Re: benq fp767 problem 17 inch

Ouch, I just blew Wonton soup out of my nose....

A wonton didn't come out with the soup did it? Now, that would really hurt!!!

[smason]

Re: benq fp767 problem 17 inch

You cannot possibly appreciate how happy we are to hear you say that.

PlainBill

Ouch, I just blew Wonton soup out of my nose....

[gasan]

Re: benq fp767 problem 17 inch

its like a magic worksssssss hooohahahahah

[sabre504]

Re: benq fp767 problem 17 inch

[PlainBill]

Re: benq fp767 problem 17 inch

ok guys i put new pico fuser and now it works without any problems

thank you all about the help bybeybeye))

You cannot possibly appreciate how happy we are to hear you say that.

PlainBill

[gasan]

Re: benq fp767 problem 17 inch

ok guys i put new pico fuser and now it works without any problems

thank you all about the help bybeybeye))