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"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHorn -
Re: Inverter mod for Philips 47PFL7422 to disable dynamic backlight?
Brightness control is not the same as backlights level control.
I just look up the user manual, there is no backlights level control for this model.
There is the CONTRAST + which there is no explanation to what they are for.
May be this is what it is for:
https://cdn.badcaps-static.com/pdfs/...7e3a209c66.pdf
Dynamic contrast enhancer
You want the LCD flat display with the highest
contrast and most vibrant images even at wide
viewing angle. The Philips dynamic contrast
enhancer uses video processing and unique
dimming backlight technology. This delivers
deep rich black levels with increased detail.
The dimming backlight increases the contrast
up to 5 times*, and at the same time improves
the viewing angle. It gives a bright, lifelike
picture with high contrast and vibrant colors,
(* factor between 2 and 5, scr.
So you are correct that if you want to be able to adjust the backlights level then I would use DC DIMMING control but then the user has to be able to set it some how since it is not adjustable in the user menu.Last edited by budm; 10-06-2015, 04:39 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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I quiet struggling with board lenovo c681 to disable 4gb samsung onboard ram because they're faulty, I followed the instruction on the schematic to disable them with resistor codes but still not detecting the ram on the slot.
can someone disable onboard ram from my dumped bios, please 🙏
I tried the other bios on this forum with disabled onboard ram, but no success
my final try is to find someone that can help disable onboard ram in my dumped bios attached in this post.
after that I officially give up 😂
thanks for awesome jobs 😊... -
I just got this tv today and it appeared to have no backlight on. After taking off the rear cover and checking again in the dark I can see that MAYBE one quadrant is lit.. But still it's quite dim. I was going to check the LEDs with my tester, and I found LED 1 and LED 2 + pins on the wire from the inverter, but I couldn't identify a ground. Nonetheless I tried using a mounting screw on the inverter board and also the chassis as ground but regardless my tester reads 300 which is what it reads when there is no voltage draw.
I don't know how exactly to test the inverter itself. Is it... -
I have a tripp-lite aspint 3636vr inverter charger which blow some of mosfet transistors. I replaced them repaired also the driver circuit and tested but the mosfets burn again.
It work very well as inverter and also as charger if I let the rear switch in auto mode (inverter) and charger only(charging) but in auto when I connect the feed line 220V AC first time it pass ok to line and start charging the batteries but when I remove the feed line it pass to inverter mode and if I do it again the second time when passing from charging to inverter the Main transformer start making a...03-06-2023, 07:07 AM -
For some reason I'm just not going to let this 19" TV defeat me. I guess because I have a schematic to work from I feel like I'm oh so close.
History- while adding a turn-on circuit I let a small screw roll under the power board. Worked through all of that circuitry, probably replacing a MOSFET and PWM controller that were not bad but I was following the service manual. Finally figured out that the power supply is in working order when the inverter section (for the backlights) is disconnected. When the +12 supply to the inverter is disconnected the +12 and +5 will come up... -
If I had a solar fed grid tie inverter (GTI), a modified sine wave inverter, and a power outage occurred, what would happen if you disconnected mains, backfed the modified sinewave inverter (MSI) into house power, and hooked up the GTI to the output of the MSI, would it work?
Next thing is trying to charge the batteries using solar power, but that's another issue ...
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