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Title: Spectrum Dual Display Led's Dimming??? Post by: Magicslots on April 16, 2010, 01:56:16 AM I converted my S+ to $.05 the other day and set up the progressive tonight. I noticed while doing the setup that the
led's are dropping about 30+ percent in brightness after about 20-25 minutes. The progressive still functions correctly, just dims. Is this a sign the power supply is going bad? :8- Is the led boards? :37- I realize these are used displays with ???unknown number of hours on them??? but I would hate for this to crash and burn on me. Any suggestions on what to check? :103- Title: Re: Spectrum Dual Display Led's Dimming??? Post by: stayouttadabunker on April 16, 2010, 02:26:42 AM Sounds like something is going on inside the power supply box when it warms up.
Do you have a spare power supply box? I'd try swapping it to rule out bad display driver boards. Title: Re: Spectrum Dual Display Led's Dimming??? Post by: brichter on April 16, 2010, 02:32:13 AM I've got one that does the exact same thing. Check the harness where it plugs into the power supply.
One a' these days I'm going to find a replacement for the 2 pins that overheated and replace them... :5- :60- Title: Re: Spectrum Dual Display Led's Dimming??? Post by: Magicslots on April 16, 2010, 02:32:43 AM Nope, no extra anything...its the only one I own, guess I will have to hunt down some spare parts :7-
Just checked all the power plugs, no signs of corrosion or overheating that I can see Title: Re: Spectrum Dual Display Led's Dimming??? Post by: stayouttadabunker on April 16, 2010, 02:49:48 AM The guys at mouser.com will send you what ever you need to replace those pins.
If you need part numbers...give me a shout!>>> Title: Re: Spectrum Dual Display Led's Dimming??? Post by: Magicslots on April 21, 2010, 11:08:06 PM I checked the power supply where it plugs into the display boards, 12.01 volts on cold power up, after a few minutes, (now only about 3) the leds dimmed.
Voltage drop was only to 11.97/11.98 volts. :50- :50- Surely that is not enough drop to dim the displays? :103- Can I assume its the display boards going bad?? :37- Title: Re: Spectrum Dual Display Led's Dimming??? Post by: stayouttadabunker on April 22, 2010, 01:35:31 AM It's almost like you need another complete working set
to swap stuff and see what's bad and what's good. Title: Re: Spectrum Dual Display Led's Dimming??? Post by: brichter on April 22, 2010, 04:50:46 AM I checked the power supply where it plugs into the display boards, 12.01 volts on cold power up, after a few minutes, (now only about 3) the leds dimmed. Voltage drop was only to 11.97/11.98 volts. :50- :50- Surely that is not enough drop to dim the displays? :103- Can I assume its the display boards going bad?? :37- Hmmm, do you have an o'scope? Check for AC waveform on top of the DC getting bigger as it gets warm. If so, check your rectifier diodes in the power supply... Title: Re: Spectrum Dual Display Led's Dimming??? Post by: Magicslots on April 22, 2010, 11:15:49 PM :8- Nope, no O'scope, besides, I haven't tinkered with one of those in years :96- I'll check around and see if I can find someone with one to borrow...
Any suggestions on what to check/how on the display boards? :103- |