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Search: Posts Made By: nicoursi
Forum: Troubleshooting Computer Displays 02-20-2013, 02:45 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

So this is the resume of the situation and I don't know what to do now:

tested all resistors and found three of them with bad readings (R603, R607, R611 test as they should):
R625...
Forum: Troubleshooting Computer Displays 02-20-2013, 02:00 PM
Replies: 67
Views: 174,744
Posted By nicoursi
Re: A guide on how to troubleshoot 2 seconds to black

I am afraid there is some no coherent information about mosfet testing


this means (please correct me if I am wrong):
a) black on pin S- red on pin D - record ohms
b) black on pin S- red on pin...
Forum: Troubleshooting Computer Displays 02-19-2013, 04:38 AM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

Thanks for answering. So:
S1 to S2 -->.377
S3 to S4 -->.378


About the mosfet, yes it is offset. Sorry for confusion :( I get the 1. on the left no matter where i set the multimeter at.

So...
Forum: Troubleshooting Computer Displays 02-18-2013, 01:43 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

I just tested the transformer T601 and I am afraid there is something wrong with it too :(
To test it i followed the instructions here: http://www.badcaps.net/forum/showthread.php?t=10419

So,...
Forum: Troubleshooting Computer Displays 02-17-2013, 02:15 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

so this is the situation:
R611 - red,red,brown,gold -216 omh -->ok
R607 - blue,silver, orange, gold - 68.2 -->ok
R603 brown,silver,orange,gold - 17.72 -->ok

R625 orange,black,orange,gold...
Forum: Troubleshooting Computer Displays 02-05-2013, 07:22 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

retiredcaps: all the mesurements i have done are according to the multimeter and mosfet section. That's the first thing I read :)
When I join together red probe and the black one i get 00.3 ohm
...
Forum: Troubleshooting Computer Displays 02-05-2013, 01:01 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

Eureka! :) Thank you very much! The heatsink is glued, but thye mosfer is not. It was enough to unscrew the mosfet and voila!

So, testing it again with the multimeter i get:
a) black probe on pin...
Forum: Troubleshooting Computer Displays 02-05-2013, 06:31 AM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

Thanks! Adding some leaded solder to the solder I was trying to melt did the trick! But the question now is: is the heat sink glued to the board? I sucked up the solder with a pump but the heatsink...
Forum: Troubleshooting Computer Displays 02-03-2013, 01:24 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

Guys, i didn't manage to unsolder the Mosfet :) I cannot melt the solder. I tried to unsolder caps and other componens on a scrap board and it worked normally.

Can it be due to the heatsink...
Forum: Troubleshooting Computer Displays 02-01-2013, 02:40 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

We are talking about testing for shorted transistors "in circuit", with power off and unplugged. So no harm possible bro' :)
Forum: Troubleshooting Computer Displays 02-01-2013, 02:17 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

Yes it is bent over but it does not touch anything. Is it safe to bend components straight back or is it better to leave them as they are? I found many bent components on this board, is it normal?
...
Forum: Troubleshooting Computer Displays 02-01-2013, 08:04 AM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

Here better pictures.
I will do the tests later and post results.
Forum: Troubleshooting Computer Displays 02-01-2013, 06:04 AM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

Sorry it is Q601 (not Q301). Yes, it is the one with the heatsink. Its is the mosfet. Sorry for confusion :duh:

What other tests do you suggest? Thank you!
Forum: Troubleshooting Computer Displays 02-01-2013, 05:15 AM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

Thanks guys for your help!
I didn't know there were more than one fuse :)

So, the following are the tests I run so long:
1. F601 and FP801 they both mesure 0.4 ohm
2. Big capacitor tested...
Forum: Troubleshooting Computer Displays 01-31-2013, 04:52 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Re: Benq fp71g+ dead. No light no signs. Capacitors look alright

i hope these picture are better.
i tested the fuse with the multimeter and it beeps.
Nicola
Forum: Troubleshooting Computer Displays 01-31-2013, 03:16 PM
Replies: 33
Views: 5,586
Posted By nicoursi
Benq fp71g+ dead. No light no signs. Capacitors look alright

Hello to everyone!
My father's monitor started to blink and my father used a toothpick to keep the two middle buttons pushed together (right arrow and left arrow). This temporarly solved the...
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