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Iiyama monitor PL2483H - No LED Backlight.

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Davy:
You are right in a sense Chris, they won't all be in series, there's many combination's consider crimbo tree lights split up into banks of four, the banks would run in parallel, ok this would reduce the voltage but at the cost of doubling the current.

I seem to recall the LED voltage to the LED banks was around 8V while the voltage to run the inverter was around 24V from the main power supply, don't take me 100% on this. I was kinda gobsmacked when I saw the LED inverter....... no more than about an inch high, very slim line indeed.

But as said there's many, many combination's, some may well have the LED voltage derived from the main power supply. Don't ask me why they tuck it under the LED housing sounds stupid to me, the only reason I can think of is RFI screening, my way of thinking is get a bank of low voltage LEDS and the current increases as the number increase's and so does the electromagnetic radiation.

In my case they looked like them LED strips you can buy, just stuck round the edges.... I guess their colour temperature and current consumption are tightly matched.

Dave

Turnip:
Hi Davy and thanks,

Mine was sorted with a P/S jobby, as noted - Chris.

Davy:
Goodun, glad it's working.... good monitors them Iiyama's.
I have a HM703 crt  un it just keeps going, going and going. I replaced a couple of swollen caps years back although it still worked fine, did the dry joints which I understand this one is noted for but the Diamondtron CRT far superior and sharper than my LCD monitor I reckon..... the only time it's off is at beddy, beddy bytime.

Cheers, Dave

Turnip:
Hi Dave,

Use a couple of 'Sammy 24 LCD' myself as can't see anything smaller these days. The CCFL one I need to fire up five minutes B4 I look, as it's initially a bit dark, The LED one has a sort of bleed through, but is incredibly bright, right from kick off.

Not seen a CRT monitor since the last century, when used to get them from the Council tip - Chris.

Davy:
Dim piccy *could*  be the cfls.... the 'whites' usually show discoloration when this happens.

Wondering if the over bright leddy screen is causing bleed through, does contrast and brightness alter any, how about scoping and finding the PWM pulse to the LED drivers.... not only will there be a brightness control there may be a back light brightness setting, me be tempted to set everything to default in case someones been 'fiddling'.

I have come across a telly anything can be adjusted WAS adjusted, nothing was left untouched, the real reason for the fiddling was the sound was awful........  granny's wind up gramophone with steel needle sounded better..... pick up must've weighed like a bag o' spuds.

Dave

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