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Hi. Been following with interest. I found the data sheet for the inverter and although I cannot find details about the control voltage, they have this: which suggests that it is a POSITIVE voltage per

That is good news Marcus! You have inspired me to tackle the job myself. 73, Matt, KD4PBS

DAC (contrast/brightness) configuration should be the same [email protected]> wrote:

Hi Milan, Well now I'm confused as my motherboard number is neither of the ones you have quoted :-o Dave

*error, * *Same for pin 1 of U605, 0 to -10V varying the brightness* <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>

Dave, First check your motherboard model: The E4400-60124 can only use display with Negative contrast (VLDC) The E4400-60035 can use pos and neg VLDC I know, its for contrast, but DAC configuration is

Hi Milan, Thanks, yes I had spotted the DAC is an AD7528 and that it seems to be powered only from +5V suggesting that the output can only be a varying positive voltage? Looking at this simplified

Hi Yves, That's a clear overview, I agree it's better to repair the first converter. I googled for the diodes for a bit, found the HSMS-2812 to be obsolete. Did find the Macom MA4E1338B1 series to be

Does anybody know ( maybe in one of the service manuals ) if I could find the pinout of what I think is 40 pin IDC that plugs into the side of the 16500L module. That cable I think it comes off 16500B

Hi all, I'm happy to report that I've successfully running the Wiltron YTO in my HP8753D :-) All thanks to Simons ( https://www.simonsdialogs.com/2020/02/hp-8753c-network-analyer-an-avantek-fix/ )

WTB HP/AG 85032B Cal Kit or N FEM parts WTB 1 each: 85032-60005 N Load Female 85032-60009 N Short Female 85032-60012 N Open Female Standards need to be in very good condition, thanks. Kit Foam in box

DAC is AD7528JP, check the datasheet Milan <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free.www.avast.com

[email protected]> wrote:

Hi Milan, Wow that's great to see an actual schematic and a test point, you are a star :-) Do you have any data for what the voltages should be at that test point TP601? Presumably when testing the

Here is brightness driver... Milan <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free.www.avast.com

Hi Marco, Here are your results and mine tabulated. That the source signal is not exactly -20.0dBm, will not change the conclusion. Just like you, I used my 300 MHz and harmonics calibrator as a

Hi Milan, I think that schematic is for the actual LCD contrast on the screen itself. What I am battling with is the LCD BACKLIGHT driver which had a very thin fluorescent tube (CCFL) driven by a high

Does anyone have a backup of the firmware of the Mass-memory module 85620A? Firmware Version 90-05-24 consisting of 3 files U1, U2 and U3. I have already split the version 91-01-16, single eprom U7

Hi Dave, Maybe this help... Milan <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free.www.avast.com

Hi HP experts, A few months ago I picked up an HP ESG-D3000A 3GHz sig-gen with a very dim backlight and discussed with several members on this platform where to find a schematic. I had decided to