Re: Philips 50PUT6400/12 no backlight
Best to replace them all
or buy new strips
Not worth the hassle just to do the bad ones..
Best to replace them all
or buy new strips
Not worth the hassle just to do the bad ones..
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Re: Philips 50PUT6400/12 no backlight
I totally agree with replacing them all.Comment
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Re: Philips 50PUT6400/12 no backlight
Replaced blown leds with some i had but seems not quite right.
Replacements were supposed to be:
3030 3v 1w
Vf 3.05-3.65v (250mA)
6000-6500K
120-130lm
but then chinese imports so who knows what they actually sent.
Think the colour temp is wrong, could see the difference before re-fitting but just wanted to see how it would look with panel back on. Not actually that noticeable whilst colours on the screen, its when its a greyish or white screen.
The black band across the top is of course where an led has gone out again, perhaps poor soldering, underated mA or just cheapo crud. Or could be another 'old' led gone out.Attached FilesLast edited by notallbad; 10-22-2018, 06:57 PM.Comment
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Re: Philips 50PUT6400/12 no backlight
LG Inotek LED has Large pad as Anode.
Most Samsung LED backlights have Large pad as Cathode.
Did you use cool white 7000K?Last edited by budm; 10-22-2018, 07:14 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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Re: Philips 50PUT6400/12 no backlight
cold white 6000-6500k, at least thats what they were advertised as.Last edited by notallbad; 10-22-2018, 07:29 PM.Comment
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Re: Philips 50PUT6400/12 no backlight
sounds like the ones i have previously tried to fit and noticed the color issue too,i have recently ordered these and will give them a try
https://www.ebay.co.uk/itm/Backlight...72.m2749.l2649Last edited by vinceroger69; 10-23-2018, 04:33 AM.Comment
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Re: Philips 50PUT6400/12 no backlight
that black band looks like tab driver is damagedComment
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Re: Philips 50PUT6400/12 no backlight
Funnily enough I ordered some of those earlier today, from a different supplier mind you and paid a slightly higher price for mine though, but will still have to wait around 4-6 wks delivery time.
Be interested to hear how they compare to your last attempt!Last edited by notallbad; 10-24-2018, 11:51 AM.Comment
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Re: Philips 50PUT6400/12 no backlight
Did you get a chance to try these ones?
Mine arrived today but look very similar to the ones I have already replaced so think I will have the same problem.
Of course, I won't know for sure until I actually swap them over and power it up once its all put back together, not sure I'm prepared to go that far just yet!7Last edited by notallbad; 11-01-2018, 01:29 PM.Comment
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Re: Philips 50PUT6400/12 no backlight
no mine have not arrived as yet and i have not got a led set here now for repair just two ccfl backlit ones.Comment
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Re: Philips 50PUT6400/12 no backlight
Hi
I think I may have the same issues but I'm only reading 60 volts on the +VLED and 0 on the -VLED. Do you still think it is an LED that is blown?Comment
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Re: Philips 50PUT6400/12 no backlight
I have almost same problem but with 49pus6561/12.
Sound works, ambient lighting works, with flashlight I see picture.
So its backlight issue.
I measured +VLED to chasis GND and its 57v
When measuring -VLED to +VLED I see voltage between 8v - 60v. the voltage goes light up, down up down up down.
Even when backlight connector is removed. I also hear something clicking but cannot find or feel what it is.
Is this job for new PSU?Comment
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I raised the question of whether PWM on the power board "dim" pin would be a reasonable assumption for controlling the backlight of a Philips TV (55put6101/12): https://www.badcaps.net/forum/troubl...d-tv-backlight. I didn't receive any insights there so I went ahead and tried it.
The setup is basically:
Rpi3 hardware PWM → 220 Ohm → NPN transistor → dim pin
Transistor is switching the 3.5 V supply on the power board.... -
this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even... -
Hello, I have an "ASUS ROG Strix G713QR" laptop, and for approx. 3 months I have the following problems:
1. Laptop keyboard doesn't work
2. The backlight on the laptop keyboard doesn't work
3. The x2 side LEDs (red) on the laptop don't work
The power button works, the touchpad works, and all the USB, HDMI, Ethernet, etc. ports work.
I already tried to reinstall all the drivers and reinstall Windows. So I don't know what to try anymore that is software-related.
But I am strongly aiming that it is somehow a BIOS-related problem,... -
when i power on the TV is black ,Do I remove the right or the left ribbon I get respectively the right or the left half screen working
Do I disconnect the plug from the power supply, no backlight
Thought the backlight would light up when you remove the plug from the power supply but no
What could be wrong if both halves work separately?... -
I have a Panasonic LED TV TC-40A420U. The TV was given to me as an attempt to fix or throw out. I replaced the Backlight LEDs and now the screen lights up, but there is no image/display. If I play with the up/down buttons I can get the display to change from black to garbled. I can't get sound from HDMI but not sure of what input is selected. I have no remote control. When I connect a laptop to the HDMI ports it recognizes a Panasonic TV for display and sound output but I can't see or hear anything through the TV. This makes me think the mainboard is OK, but not sure if mainboard can...
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