Re: Philips 75pfl5704/F7 No sndby power
Never mind I was able to test. Each of the 4 power lines tested at 54.4V with the tester and lights can be seen through the back of the TV.
Still no power at Protect3 so does anyone know what I should check next? Thanks
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Re: Philips 75pfl5704/F7 No sndby power
So after researching a bit it seems Protect3 corresponds to the backlight and a possible LED failure.
I bought a LED tester but I'm running into another problem.
How do I test these LEDs?
Unlike most videos and posts on the subject the wires running from power supply to the strips are labled ILED 1-4 and VLED 1-4. When I test in pairs or using cold ground I get no response from the tester as if its an open circuit.
These Philps and Emerson boards are irritating.
Thanks for your help!...
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Re: Philips 55PUS7363/12 Panel defekt or ? Help
I am really new to this so I may be looking at it from the wrong way but using the troubleshooting guide it looks like a possible bad T-Con board.
[url]https://www.badcaps.net/forum/showthread.php?t=25810[/url]
Does it do it on all inputs and picture settings?Re: Philips 55PUS7363/12 Panel defek...?t=25810[/url]
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Re: Philips 75pfl5704/F7 No sndby power
The cable between the power Board and the main board is reading normal voltages at most of the pins. I cannot get Protect3 or either backlight which from what I understand are all a part of the backlight system.
Also the power on P-on-20v never goes back to the 12v when the TV should be in standby mode. As soon as the TV is plugged in the power on all working pins flows.
Anyone work on Philips TVs that may have a idea on a next srep?...
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Re: Philips 75pfl5704/F7 No sndby power
UPDATE
Okay I replaced the Main Board with a new one.
I am now getting 3.3V going into the power Board around 19V going out instead of the previous 0V and 12V.
I am not however getting any voltages at the Backlights power connector on the Power Board (Image). I also do not see any image on the screen when holding a light to it. It's possible that my flashlight could be too weak tho.
Any ideas? I will be scouring the interwebs for ideas...
PS. I need to also post that the tech manual in the...Last edited by CurtisC; 04-30-2023, 12:41 AM.
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Re: Philips 75pfl5704/F7 No sndby power
Ah awesome. I'll move away from the power board. The last owner took this set to a tech and they couldn't get it working, they just said it was the power board. I'm glad you knew better. Thanks a lot...
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Re: Philips 75pfl5704/F7 No sndby power
Thanks, that's the one I've been using. I'm new to this so I wasn't sure how it worked but I was confused since the other PB I've seen people work with had a standby marking on the boards.
So even if P-ON-H2 has no 3.4v power the board is probably okay, and it is something else all together?...
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Re: Philips 75pfl5704/F7 No sndby power
Oh thank you this is what I was wondering. The P-ON-H2 (pin 4) on CN651 does not have any power when measured on the power board. And yes all P-ON+20v have 12v.
Sorry I didn't see your post until after I posted about the transformer. Greatly appreciate it!...Last edited by CurtisC; 04-12-2023, 08:59 PM.
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Re: Philips 75pfl5704/F7 No sndby power
I tested the transformer (T601) and it had around 400v going in from Hot but zero on the cold side. This was tested using cold ground on cold.
Is there anyone who knows by looking at the tech manual if this transformer may need to be triggered somehow? Or is this probably a failure point that I should replace?
Thanks...
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Re: Philips 75pfl5704/F7 No sndby power
Thanks for the assist!...
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Re: Philips 75pfl5704/F7 No sndby power
How can I test if there is power getting to the transformer on the hot side of the board? Do I still use a neg terminal of a cap for ground?
I don't want to do more damage.
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Re: Philips 75pfl5704/F7 No sndby power
I just tested it on the replacement board that I have to send back cause its not supplying standby either, and they both read the same.
Think I may have hit a dead end. I'm just not experienced enough with this....
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Re: Philips 75pfl5704/F7 No sndby power
Here you go
I'm reading 707 one way and 623 the other. Not sure which is pos and neg....Last edited by CurtisC; 04-12-2023, 12:49 PM.
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Re: Philips 75pfl5704/F7 No sndby power
I went ahead and purchased another board off eBay but found that one is also not supplying standby, which I assume is labeled ALL+3.3V since there is no other logical marking. This board in the pictures is my original power board. I have done some poking around however I have no idea if I'm testing correctly. Ive been going off youtube videos from TV repair channels and the like. I am testing using cold ground on Cold side, and using negative capacitor pins as Hot ground.
I know the fuse is good. Main 400v caps all get power....Last edited by CurtisC; 04-12-2023, 01:31 AM.
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Philips 75pfl5704/F7 No sndby power
Hello everyone. I'm brand new to the group. I'm trying to fix this Philips 4K TV. I have minimal experience with most of this so forgive me if I don't understand half of what is posted on these forums. I'm trying to find my way through it.
Basically I got the TV from a previous owner who said it just died on them. So I wasn't there when it broke. It will not power on, no lights, no backlight, no sound.
The output of the power supply has a 27 pin connection to the main board. Pins 18-27 (labeled P-On+20v) are the only pins reading power at 12v each. The pins marked ALL+3.3v, which...
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