Question about BenQ FP567s 15" LCD Monitor

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Screen blacking in and out

My screen is blacking in and out. The green monitor light also flickers on and off as the monitor briefly shows the screen. Have tried it on a diff pc with same results. In fact just plugging the monitor to electricity results in the green monitor light flashin on and off. Monitor is only 3 years old so I am surprised if it the monitor that has gone. Any suggestions please ?

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Re: Screen blacking in and out

Monitor going black after a few seconds can be causd by a faulty power supply or inverter. Some monitors have both as one unit.
Sometimes it is basic failed capacitors, After that then I would look at transistors.
The average monitor from 17 to 20 and sometimes the 22s have usually 4 bulbs in them. One bad bulb will also cause the inverter to not fire up.
Bad bulbs usually show pinkish tint, or flickering or are dark at center top or bottom of the display.
ebays bammbammfran

Posted on Oct 05, 2008

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Re: Screen blacking in and out

I have Benque FP567s 4 year old now, i just have image for around 1 second and then i just get a black screen, the power led also goes off, and each time the i hit the power button, the problem repeats. But when I pull the power cord this side & other side many times the monitor works normal , but the proble may repeat in hours or next startup (It was also checked & found there is no problem in power cord or its fitment )

Soln: From above symptoms I suspected some loose connection on PCB of LCD. I have opened the casing. I found one screw is missing out of two, which hold power socket to chassis.

From this I have analyzed that probably due to this screw missing (manufacturing defect), some force of fitting cord into this socket was transferring , especially when removing , fitting back monitor cord into the socket during last 4 years.This might have resulted in ing of PCB or Power socket solder or some weak solder . Due to this, when we move power cord to fro, probably the above problem is disappearing temporarily.

I dismantled the 2PCBs (both boards are interconnected) and inspected. There was no , but I suspect soldering of L563 & power socket connections weak/ suspect able.

I soldered above joints & nearby joints (probably 5 % of total joints on main board).

The problem is solved on 31.01.08. Time taken for analysis : few minutes

Decision for opening by self : 2 days

Duration of repair : 1hr 15 min.

Damage: while opening of external plastic casing, some plastic holders / clamps got broken, probably if casing is required to open next time, it will be easier. This may happen even with a good mechanic.

Care: to be opened in modular way, by plugging off connecters between one module to other. Assy is to be followed in reverse.

Posted on Jan 31, 2008

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Re: Screen blacking in and out

Hi Esdee, Don't be too surprised if the monitor is having problems. The fact that it does the same thing on another PC is pretty good proof that is in fact the monitor. As far as what is going on the green power LED going on and off in conjunction with the blackouts indicates a power problem to me. - Does wiggling the power cords, plugs cause any change? - When the screen blacks out shine a flashlight on the screen and look to see if you can see any faint images. If you do then you have a backlight problem. If none of this works any further troubleshooting really requires some experience working around electronics and high voltage. Let us know how you want to proceed, as as always please don't forget to rate this posting.

Posted on Feb 06, 2007

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