Monitor - shuts off after half a second

[lion_sta]

Hello everyone,

joined this forum specifically for this question.

I have a monitor and decided to fix it on my own. It wouldn't have been to expensive to take it to a shop but I want to learn, so this is one of the tasks.

As the title says, it turns itself off after half a second.

I have replaced some bulged capacitors and it behaves similarly.
Desoldered a couple of transistors and they seem fine. All changes/tries are marked with blue.

Can you guide me step by step what should I do next?

Also, was looking at the capacitor marked with yellow and already bought a replacement. How do I check if it's working fine?

http://imgbox.com/Z8ixynYz
http://imgbox.com/AIdxeNby
http://imgbox.com/pNuMypZn

Thank you very much!

[lion_sta]

Re: Monitor - shuts off after half a second

Forgot to mention that it's a Benq monitor. And when it turns off, the on/off light turns itself off as well.

Also, I can here a slight buzz in the lower center part of the board.

[Joe Black]

Re: Monitor - shuts off after half a second

Have very similar issue, check https://www.badcaps.net/forum/showth...ght=benq+turns

Buzzing here also, but I'm positive that can be ignored for now.

[lion_sta]

Re: Monitor - shuts off after half a second

Thank you.

I found a couple of 11P06 that seem to be faulty. So will need to replace those before anything else.

[Joe Black]

Re: Monitor - shuts off after half a second

You need to check Q805, Q812, resolder all the transformator pins (all 5), the components mounted on radiators, then C830-C836.
I would add C824-C827, too.

[lion_sta]

Re: Monitor - shuts off after half a second

Do you happen to have the schematics of this one?

[lion_sta]

Re: Monitor - shuts off after half a second

Oh, you did post it in the other thread.

[Joe Black]

Re: Monitor - shuts off after half a second

Google out your model. If you find out service manual, that can be really helpful for us beginners

[lion_sta]

Re: Monitor - shuts off after half a second

This is what I was looking for. Now I can identify which line is not giving enough voltage.

I wonder what would happen if I connect the black to 3V and red to 12V, would there be a short?