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| Thread ID: 101255 | 2009-07-06 22:19:00 | Crook monitor | linw (53) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 789670 | 2009-07-06 22:19:00 | Anyone seen this? Benq FP91G+ on power on shows image but the image disappears after a very few seconds . Green signal light remains on . It is a monitor problem as it has been moved to another computer with same results . Damn and blast!!!! Economical to get repaired??? |
linw (53) | ||
| 789671 | 2009-07-06 23:33:00 | Probably not if its out of warranty. Is it? Could ring their 0800 and see what they would expect the cost to be. Benq - :yuck: |
pctek (84) | ||
| 789672 | 2009-07-07 00:33:00 | It'll be out of warranty as bought Dec 2005 . I have left enquiries with Benq and PCOnline but haven't yet found a NZ based ph no . Sounds like the monitor is entering a save meltdown mode . Maybe as simple as crook caps . Bit reluctant to pop it open yet . Still, 21 . 5 panels cost under $300 so this may be the sensible option . |
linw (53) | ||
| 789673 | 2009-07-07 03:31:00 | Grab a viewsonic or an LG. Both quite cheap and rarely have had any problems with them. | Blam (54) | ||
| 789674 | 2009-07-08 09:51:00 | I've only just finished complaining about HP monitors (with a BenQ board) on another thread. Look for the heatsinks at the top of the board. Chances are there's a capacitor (470uF 25v) between these aluminium heatsinks that is on a lean and with a bulge between its legs. Also likely that it's companion on the other side of the heatsinks is doing the same. Also in the same vicinity is a black cylindrical thingy (some type of enclosed fuse) that might be showing heat damage (check on the soldered side for lost solder or loose tracks on the board. You might also see a darkening of this area of the board where the capacitors spewed out their guts. Recommendation : Jaycar for the caps. Replace them both. |
Paul.Cov (425) | ||
| 789675 | 2009-07-08 22:55:00 | Thanks for reply, Paul . I have studied the components and board under a magnifying glass and it shows no signs of overheating or cap bulging . I was hoping to see cap problems as this would be easy to fix! I am still not entirely sure whether it is an inverter problem or bad ccfl . Given that the backlights do come on briefly, is this a sign that the inverter is working? Perhaps not - the inverter may fire up but due to comp failure be unable to sustain the current??? I guess the switching transistors must be OK as it does produce a high voltage . Can ccfl's fail in such a way as to cause the inverter cutoff to kick in?? I can only see one fuse on my board and it is the main pwr supply fuse . But a strategy may be to replace caps one by one just to eliminate them . Cheers . |
linw (53) | ||
| 789676 | 2009-07-15 22:56:00 | Well, now got a going monitor . Yea!! Replaced all the bigger caps but the backlights still switched off . Eventually found two shorted transistors that were driving the high voltage to one pair of ccfl tubes . Replaced these with a couple of TIP41C's I had here and it now goes . Leaving it on for a burn-in test . Have ordered some C5707 replacements to complete the repair . So, now have a spare LCD!! (hopefully) . |
linw (53) | ||
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