Question about HP TBD420NR Hewlett-Packard Laptop Lcd Inverter For F700 P/N: TBD420NR -
I am trying to use a laptop CCFL as a light source fir a light box. I have the inverter it uses but need to know what the input voltage(s) need to be and through which pins of the 6-pin input connector. I am expecting there to be tow voltages, one to power the CCFL and one as a "switch" voltage to keep the CCFL on. I haven't been able to find any circuit diagrams or tech specs that help. Can anyone help?
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Posted on Jan 02, 2017
Dhen: This monitor uses a special Power Adapter as shown... Also the Pin designation is from the NOTCHED PART BEING ON TOP: NOTCH U +V O O +V GND O O GND SithPitt
Posted on Jul 04, 2007
SOURCE: HP zd8000 laptop power supply
I found the solution - and implemented it, it works. The blue (ID) line needs to show 7.5v. The simple way to acheive this is to simply put a 47k resistor from the +19.5v line to the ID line. Apparently there is a pull down at the computer end that means it ends up at 7.5v.
I cut the cable about 6" from the old HP power supply. I then soldered a female power socket onto the loose cable and soldered the 47k resistor between the ID line and the +19.5 line. I then plugged this onto my two pin power supply and the plugged it into my computer. It works very nicely.
Not wishing to junk the HP power supply unecessarily - it was still producing the 19.5v - I then soldered a power plug onto that ignoring the ID line. That now works as well. It seems that the circuitry that provided the 7.5v ID voltage in the HP power supply became flakey. I could have just opened up the power supply (I have already done that) and disconnected the blue line from the circuit board and just tied it to the +ve line via the 47k resistor and then wrapped it with the usual insulating tape.
Posted on Apr 03, 2009
Well thats not good, however if you can identify the Positive, usually RED, and Negative, usually BLACK. on the Fan, You can actually carefully insert the bared wire into a spare drive power connector, fans are all 12 V. You can use the YELLOW.. +12V & the alongside BLACK - 0V. This will power your fan. BE CAREFUL doing this. Once inserted use a piece of tape to secure the wires and fold them back against the Plug and secure. You may be able to buy a converter that plugs into that power connector & the fan?
Posted on Feb 22, 2010
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