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| Nokia knockoff LCD backlight current draw http://forum.lcdinfo.com/viewtopic.php?f=9&t=1613 |
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| Author: | jeevan [ Sun Jun 25, 2006 1:09 ] |
| Post subject: | Nokia knockoff LCD backlight current draw |
Hi All, I measure the Nokia knock off LCD to draw 150mA when its backlight is powered with a 7V DC boost circuit -- I measured this both on the Sparkfun Carrier board and on my own custom board with a similar DC boost circuit. I thought the backlight was only supposed to draw 50mA or so -- I tested this with a never-used LCD as well as ones I've been working with for awhile. The DC boost circuit ought not to be leaking gobs of current; it's controlled by a special IC (The TI TPS61040). Just to be safe, I also measured the resistance across power and ground; it's about 1.6 MOhm. Am I missing something? this is a lot of current to be drawing, I think. thanks, Jeevan |
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