benq fp767 problem 17 inch

[gasan]

Re: benq fp767 problem 17 inch

its 532 (i put the multimeter on 2000k ohm) is that good or bad ????

[retiredcaps]

Re: benq fp767 problem 17 inch

the main fuse is ok because i can see the benq logo on the screen and my operating system windows xp but all dark without a light

1) STOP and READ CAREFULLY. This is getting silly.

2) STOP AND READ for one second.

3) You have been asked no less than 6 times (in posts 5, 7, 12, 16, 19, and 21) to check the picofuse PF751.

4) CHECK picofuse PF751.

5) Report the ohms measurment.

[gasan]

Re: benq fp767 problem 17 inch

the main fuse is ok because i can see the benq logo on the screen and my operating system windows xp but all dark without a light

[gasan]

Re: benq fp767 problem 17 inch

collector -emiter= 198
collector- base= 493
base- emitor = 723

[retiredcaps]

Re: benq fp767 problem 17 inch

Some people (like some of my co-workers :slap: ) when sent an email with 2 questions, always seem to only answer 1.

I find this useful and will probably switch to this asap. Start using numbered questions.

1) where do you live?
2) do you know how to use a multimeter?
3) do you have basic electronics knowledge?
4) do you have a solder iron?

This forces the poster to enumerate each question and answer.

[smason]

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?????

Sorry my crystal ball is in the shop....
What readings?
And the fuse???

[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?????

[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.

[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>

[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

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.

[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

<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

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

[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

where are you guyssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss

[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

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

[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

[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.