benq fp767 problem 17 inch

[sabre504]

Re: benq fp767 problem 17 inch

Whereabouts are you in the world ?
These parts are not to expensive depending on where you are may be able to point you in the right direction

[gasan]

Re: benq fp767 problem 17 inch

I'm afraid I'll pay for the ingredients and then will not work because it will cost alot of money

[sabre504]

Re: benq fp767 problem 17 inch

You must also resolder the transformers
Then that should cure the fuse prob

[gasan]

Re: benq fp767 problem 17 inch

ok i understand you but if i replace these transistors , the picofuser will not blow up?????because i changed 3 brand new fusers

[sabre504]

Re: benq fp767 problem 17 inch

As Plainbill said change

4x C5707 (2SC5707) outlined in red

2x FU9024N outlined in blue

turn the board over and resolder 4 x transformers outlined black

then put in new picofuse

[gasan]

Re: benq fp767 problem 17 inch

I changed for three new fusers working but the problem is when I pull a cable jack and returns it to , the fuser screwed and no light no light

[PlainBill]

Re: benq fp767 problem 17 inch

its like somthing is shorting the fuse !!!!!!!!! so wierd

Replace Q739, Q740, Q743, Q751, Q759, Q760, PF751. Remove all the solder from the pins of the 4 inverter transformers, then resolder them.

PlainBill

[gasan]

Re: benq fp767 problem 17 inch

its like somthing is shorting the fuse !!!!!!!!! so wierd

[gasan]

Re: benq fp767 problem 17 inch

ok guys i bought brand new picofuse 3.15a and its working but suddenly when i unplug the cable from the wall (AC CABLE) and put it back agian there is no light (the same problem)

[retiredcaps]

Re: benq fp767 problem 17 inch

what is the pecofuse i really didnt get it and What its role ????????????????

1) Spell it correctly. It is picofuse. Not pecofuse or pikofuse. Spelling it correctly will help when you use the search function (hint).

2) Searching for picofuse yields ...

https://www.badcaps.net/forum/showpo...50&postcount=2

[gasan]

Re: benq fp767 problem 17 inch

ok thank you i really appreciate you guys about your efforts.
i have a little quistion for you guys , what is the pecofuse i really didnt get it and What its role ????????????????

[retiredcaps]

Re: benq fp767 problem 17 inch

so i did all what you mention (resoldring ....etc).
what should i do now just wait to get brand new fuse or test somthin else ????

If you have done *everything* that smason and Krankshaft have outlined, then go ahead and get a new fuse.

Before installing it, test it out of circuit to ensure it reads 0.3 ohms on the 200 ohm (two hundred) scale.

After you install it, review all the steps in #28 and #30 one last time. Then and only then apply power.

[gasan]

Re: benq fp767 problem 17 inch

this test wihout the pikufuse (i desolder it)
base - collector =0.49 (at 20k multimeter)
base - emmiter =6.63 (at 20k multimeter)
collector -emmeter =5.85 (at 20k multimeter)
these results apply to q740 + q739 +q760 +q759

[gasan]

Re: benq fp767 problem 17 inch

so i did all what you mention (resoldring ....etc).
what should i do now just wait to get brand new fuse or test somthin else ????

[retiredcaps]

Re: benq fp767 problem 17 inch

thank you so much retiredcaps so how could i know it just a problem with pikofuse

It is possible that just the fuse is bad. Fuses can go bad just by themselves.

However, it is prudent to take precautionary measures as outlined in #28 and #30.

[gasan]

Re: benq fp767 problem 17 inch

thank you so much retiredcaps so how could i know it just a problem with pikofuse

[retiredcaps]

Re: benq fp767 problem 17 inch

at 200 ohm on the multimeter it read "1"

1) You have a blown picofuse. This picofuse protects the inverter section. If it is blown, there will be no backlight. This will need to be replaced.

2) If you don't want to replace it again, pay attention and follow ALL the steps as listed by Krankshaft at

https://www.badcaps.net/forum/showpo...2&postcount=21

3) Even though it is not the same monitor, they are made the same vendor and have the same problem.

4) You *MUST* do all the steps outlined by Krankshaft. It is a mandatory.

5) Also, follow the suggestions by my fellow Canadian, smason, in post #28.

[gasan]

Re: benq fp767 problem 17 inch

at 200 ohm on the multimeter it read "1"

[smason]

Re: benq fp767 problem 17 inch

That's bad. It should read 000 to 008 give or take depending on the meter/leads etc.

I recently repaired 2 of these, one had shorted transistors, the other just had a bad fuse.

So it IS possible that the fuse is the only problem.

I would do the following:

1 re-solder all of the transformer pins
2 double check the transistors
3 replace fuse
4 test

[retiredcaps]

Re: benq fp767 problem 17 inch

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

1) Retest with your multimeter set to 200 (two hundred) ohms.

2) If it says "1" on the left hand side of the display, that means out of range.

3) A good fuse on the 200ohm setting should read 0.3 ohms.

4) Report the new ohm measurement.