benq fp767 problem 17 inch

[gasan]

hey guys i have a problem with my screen , when i attach my ac cable to the wall the blue button turn on without any signal comes to the screen even at startup there are no benq logo so guys i need help??????????

[PlainBill]

Re: benq fp767 problem 17 inch

hey guys i have a problem with my screen , when i attach my ac cable to the wall the blue button turn on without any signal comes to the screen even at startup there are no benq logo so guys i need help??????????

Yes you do. Do you want an instant diagnosis based on very little information, or would you like to approach the problem systematically?

If you want to jump in and throw money at the problem, order REPAIR KIT E172FPB E173FPB FP72G FP731 - 2SC5707 C5707 from an eBay seller and install it.

If you want to take an intelligent approach, open the monitor up, take pictures (top and bottom) of the power supply / inverter and ATTACH them to your next post. See the link in my signature for instructions.

PlainBill

[gasan]

Re: benq fp767 problem 17 inch

thanks for the reply , i have been looked at the powersupply there are no blown capacitors some one told me that the logic card is gone , so i want to diagonse the main reason of the problem can you help me please (step by step )

[gasan]

Re: benq fp767 problem 17 inch

there are no colors on the screen its blank , the whole monitor not working execpt the button blue lamp (on /off button) even there is no electric sound came from the flurecents !!!!!!!!!!!!!!!!11

[smason]

Re: benq fp767 problem 17 inch

there are no colors on the screen its blank , the whole monitor not working execpt the button blue lamp (on /off button) even there is no electric sound came from the flurecents !!!!!!!!!!!!!!!!11

Some questions:
Do you own a multi-meter, and do you know how to use it?

Can you solder?

If the answer to all of those was yes, then we can probably help you.

You can't always see bad capacitors, blown transistors and blown fuses just by looking at them. The chances of the problem being the logic board are about 1% 99% more likely is the power supply/inverter circuitry.

So if you can answer the questions, post good clear photos of the top and bottom of the boards, and mabe even hint at what part of the world you're in, we can move forward.

[gasan]

Re: benq fp767 problem 17 inch

yes i can do all the things that you mentioned , oh yes i am ready i have multimeter and solder ...............

[smason]

Re: benq fp767 problem 17 inch

Excellent. Next step, post some photos, and we'll give you some tips on what to test.
I'm betting at least 1 bad transistor and pico fuse.

[PlainBill]

Re: benq fp767 problem 17 inch

Excellent. Next step, post some photos, and we'll give you some tips on what to test.
I'm betting at least 1 bad transistor and pico fuse.

I'll see that and raise you two bloated caps.

PlainBill

[gasan]

Re: benq fp767 problem 17 inch

ok i will upload pics of the power supply and logic card thanks guys

[gasan]

Re: benq fp767 problem 17 inch

here are the pics of the powersupply and the logic board
powersupply=no model=etl-xpc-801 1.6mm

[gasan]

Re: benq fp767 problem 17 inch

where are you guyssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss

[PlainBill]

Re: benq fp767 problem 17 inch

where are you guyssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss

The agreement I have with Topcat is that I am allowed to have a life. Taking most of a day to upload the pictures, uploading useless pictures, then expecting help within 18 minutes suggests you should get one too.

Q739, Q740, Q743, Q751, Q759, Q760, PF751. Test them and replace any that are bad.

PlainBill

[gasan]

Re: benq fp767 problem 17 inch

how to test them on the multimeter and where to put the multimeter (where it should be on ohm or volt .............) ?????????????

[smason]

Re: benq fp767 problem 17 inch

<facepalm>

I think you need to re-read a few posts. We said "Good CLEAR pictures" and I asked do you have a multi-meter and know how to use it....

Luckily PlainBills newly modified eyes could magically read the component designations.

And seriously... 4:43 AM (MDT) and you're impatient for responses? Oy!

We'll help you, but really, try to help us help you.....

[gasan]

Re: benq fp767 problem 17 inch

ok guys i looked at my screen and see that there is a signal came to the screen (benq) logo and the windows xp) but without light mybe the problem with the power supply or the lamps ??

[smason]

Re: benq fp767 problem 17 inch

how to test them on the multimeter and where to put the multimeter (where it should be on ohm or volt .............) ?????????????

Put your meter on the diode test setting, then test each transistor.
Red on base black on collector
Red on base black on emitter
Red on collector black on emitter
then reverse red and black and repeat.

You should see a reading between approximately .400 to .800 in one direction, and open in the other.
I suspect you'll see at least one that's shorted. Also test the fuse. If one of the transistors shorted it will likely have taken out the fuse.

[PlainBill]

Re: benq fp767 problem 17 inch

Put your meter on the diode test setting, then test each transistor.
Red on base black on collector
Red on base black on emitter
Red on collector black on emitter
then reverse red and black and repeat.

You should see a reading between approximately .400 to .800 in one direction, and open in the other.
I suspect you'll see at least one that's shorted. Also test the fuse. If one of the transistors shorted it will likely have taken out the fuse.

Probably also a good idea to mention resoldering the transformers. Several reminders may be necessary...

PlainBill

[smason]

Re: benq fp767 problem 17 inch

Probably also a good idea to mention resoldering the transformers. Several reminders may be necessary...

PlainBill

Yes was going to get to that in a seperate post.
Some people (like some of my co-workers :slap: ) when sent an email with 2 questions, always seem to only answer 1.

If you send each question in a seperate email, they magically get answered.

Kinda like when you post "please post pictures, AND tell us where you are"
you'll never find out where they are </hint>

[smason]

Re: benq fp767 problem 17 inch

ok guys i looked at my screen and see that there is a signal came to the screen (benq) logo and the windows xp) but without light mybe the problem with the power supply or the lamps ??

Yes. The transistors and fuse Plain Bill listed are all involved in the inverter circuit, which is responsible for powering the lamps.

[gasan]

Re: benq fp767 problem 17 inch

ok q759+ q760 + q739+q740 gave me the same reading !!!! mybe its high voltage capacitors (blue). thank you guys
any suggetions?????