My VL193 flickers intermittently. The flicker usually goes away when I power it off and power it back on but sometimes it remains. I have posted pictures of an overhead view of the power supply and two closeups of the inverter.
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Princeton VL193 intermittent flicker
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Re: Princeton VL193 intermittent flicker
1) It could be those two caps on the inverter board that are causing the flickering.
2) Check the DC voltages on the connector to the inverter board and see if they are stable or fluctuating.--- begin sig file ---
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Re: Princeton VL193 intermittent flicker
Originally posted by ravenor View PostHow would I test the DC voltage?--- begin sig file ---
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Re: Princeton VL193 intermittent flicker
Originally posted by ravenor View PostYes I have one.
1) Set your Fluke 83 III to DC volts (2nd switch position - V with the solid line and dash line).
2) Plug in and power on your lcd. Hookup a working computer displaying your favourite wallpaper.
3) Put your black probe on a ground screw on the inverter board.
4) Put your red probe on each colored wire on connector CN1 on the inverter board.
5) Number each pin and report each DC voltage reading. See if the readings are stable or fluctuating during the flicker.
See my fellow Canadian Afrotechmods' excellent multimeter tutorial (5 minutes long)
http://www.youtube.com/watch?v=bF3OyQ3HwfU--- begin sig file ---
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Re: Princeton VL193 intermittent flicker
PS. If you ever think about selling your Fluke 83 III, send me a PM.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: Princeton VL193 intermittent flicker
Post a picture of the logic/main board as well. Flickering could also be due to a bad voltage regulator on the logic/main board. Bad caps on the logic/main board is another possible cause.--- begin sig file ---
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We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
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Re: Princeton VL193 intermittent flicker
Originally posted by ravenor View PostHere's the mainboard.
1) Plug in lcd and power on. Hookup a working computer again. Put your Fluke 83 III into DC voltage.
2) Put your black probe on a ground screw on the main board.
3) Put your red probe on each pin of each component except for the top tab.
4) List the part number of each component and its DC voltage reading for each pin.
5) Report findings like so
IC100
part number = 7805
pin 1 = 0.0V
pin 2 = 5.0V
etc
6) Try to take this readings while the monitor is flickering.--- begin sig file ---
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Please do not post inline and offsite as they slow down the loading of pages.
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Re: Princeton VL193 intermittent flicker
Originally posted by ravenor View PostI think I've solved the problem for now. It turns out that the refresh rate was set to 75Hz, after I changed it to 60Hz, the problem went away.--- begin sig file ---
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Please do not post inline and offsite as they slow down the loading of pages.
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