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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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My cheap crappy 1KW grid tie inverter (GTI) seems to keep blowing IGBTs. When I first got it, it had two failed IGBTs. It used four 60N100's (TO264). I bought 5 from a dubious source (fleabay) and replaced just the two that were dead. The GTI worked for almost two years but recently one of the two that I replaced failed. Since I had three spares, I replaced the dead one. Then a few weeks later it failed again. Weird. Well since I bought dubious China-sourced IGBTs from fleabay it could very well just be a mixture of fakes. I replaced it, but then a day later it failed again! I put in the last...
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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... -
Hello, guys!
The same 32" Philips TV I was having video issues, but now I don't have standby led at all. Someone here shared with me the schematic of the power supply, and checking the voltages, I see right after the resistor R604 I'm getting 1.6 v which is too low for enabling the Gate of the Q601 mosfet (the diagram says 4.2). On the R614 resistor I'm getting 181 V in and 117 V out, then through R603 I'm getting the same 117 V in and 59.9 V out, finally getting the latter voltage in the R604 BUT getting just 1.6 V out, which is the voltage that goes on to the Gate of the Q601... -
Philips 8200 series 65PUS8204/12 stuck at Philips Logo, it does not reboot it just stays on the logo.
It does power up when pressing the power button.
I already try the power button while plugin the plug with no result.
Also put the latest firmware autorun-TPM191E_R.001.004.100.000.upg on a MBR/FAT32 USB stick at USB port2 with no result either.
Could this be an PSU or eMMC issue ?
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