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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Envision Flat panel
I'm still not sure what to measure for voltages in this flat panel monitor
that goes dim about 2 seconds after I power it up. It's so dim, you need to look at it very close in the dark to see a faint picture. Does anyone have any schematics, have any experience with this model, or can lead me to a site that may have some tips? Thanks in advance |
#2
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Envision Flat panel
Peter: It sounds like your back-light is going off. Probably the inverter is bad. Hold a NE2 (Neon gas) bulb near the transformer on the inverter board. The gas will glow if the transformer is working and generating the 900 to 1200 volts AC needed by the back-light bulbs. Check for bad electrolytic capacitors on the inverter. Also check the capacitor (if there is one) at the primary of the transformer. Hope this helps... John |
#3
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Envision Flat panel
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#4
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Envision Flat panel
Peter wrote:
wrote in news:1157122368.693790.34890@ 74g2000cwt.googlegroups.com: Peter: It sounds like your back-light is going off. Probably the inverter is bad. Hold a NE2 (Neon gas) bulb near the transformer on the inverter board. The gas will glow if the transformer is working and generating the 900 to 1200 volts AC needed by the back-light bulbs. Check for bad electrolytic capacitors on the inverter. Also check the capacitor (if there is one) at the primary of the transformer. Hope this helps... John I'm new to the theory of flat panels. Besides an inverter being a logic gate, what is it in regards to this circuit? Thanks The inverter he's speaking of is a circuit that generates the high voltage for the fluorescent backlight - like an electronic ballast. |
#5
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Envision Flat panel
Time to get a professional involved with servicing the product.
"Jumpster Jiver" wrote in message news:a9fKg.187$I71.161@trnddc01... Peter wrote: wrote in news:1157122368.693790.34890@ 74g2000cwt.googlegroups.com: Peter: It sounds like your back-light is going off. Probably the inverter is bad. Hold a NE2 (Neon gas) bulb near the transformer on the inverter board. The gas will glow if the transformer is working and generating the 900 to 1200 volts AC needed by the back-light bulbs. Check for bad electrolytic capacitors on the inverter. Also check the capacitor (if there is one) at the primary of the transformer. Hope this helps... John I'm new to the theory of flat panels. Besides an inverter being a logic gate, what is it in regards to this circuit? Thanks The inverter he's speaking of is a circuit that generates the high voltage for the fluorescent backlight - like an electronic ballast. |
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