First post, Benq monitor power issue?

[belliez]

Hi,

I wish I found this forum years ago! Good info and advice and had to self learn everything but could have saved hours and hours if I knew about this place!!

I have a quick question. I have a Benq FP71G+ monitor (Model Q7T4). With just the monitor connected to power and no vga cable connected I power it on by pressing the on/off button and the led lights for a second and goes out. You can repeat this process. There is nothing displayed on screen.

Thinking its a power issue, fuse or something but not opened it yet. Wondered if anyone had any idea / advice? Hoepfully it is as simple as a faulty button but doesnt look faulty or feel faulty?

Thanks

[emilije]

Re: First post, Benq monitor power issue?

Always is a good idea to post some pics (upside and downside) of PCB. In a meantime, do a visual inspection of board and components, check fuses with multimeter, put your eyes on caps especially, any traces of burned components and etc. That's for a start.

[jetadm123]

Re: First post, Benq monitor power issue?

Hello and welcome to the forum! BenQ models are notorious for shorted 2sc5707 transistors. Also possibly shorted FU9024 and open fuse. Check these transistors for shorts. Complete repair kits can be purchased through Ebay for around $6.00. Do a search on ebay for 2sc5707. These transistors should be replaced in pairs.

[retiredcaps]

Re: First post, Benq monitor power issue?

BenQ models are notorious for shorted 2sc5707 transistors. Also possibly shorted FU9024 and open fuse. Check these transistors for shorts.

In addition to all the above, you must resolder all the transformer pins otherwise you will be doing the same repair again in the future.

This Benq model and its variations all seem to have the same problems. At least the problem is well known by members here and there is lots of help and information.

[Richie_asg1]

Re: First post, Benq monitor power issue?

As above but check with the computer feed in as well, as some won't do anything without this turned on. Goes into power saving mode eg. off.

If it obviously doesn't work, check the power transistors nearest the tube outputs as above, and look closely at their capacitors & solder joints.

Worth resoldering all the transformer pins as it only takes 2 mins to add a little and reflow.

This forum is great - has helped me a lot.