Philips PSU (715G7350-P01-000-002S) behaving funny

[hervou]

Hi everybody,
I briefly unburry the thread to give you a small update, in case someone keeps stats about defect components on this PSU. Well the TV is back to life after having replaced D9105 😍
I'm really happy, as well as my mother in law since she can watch the tour de france now.
Thank you a lot for your help !!!
Hervé

[Sasiccia]

Hi everyone!

I seem to have stubled in a similar issue:

My Philips model 43pus6401/12 tv doesn't turn on
Not even the power led goes on
I've looked for info online and gathered information on which are the most common fault points
I've then procedeed to gather readings with my multimeter
I would you be as kind as to help me out understanding which components seem faulty? :

Component reading with multimeter:

Fuse position F9902

Ebay board
―⯈⊢ = 00.1
200 Ω = 00.3

Original board (Also faulty)
―⯈⊢ = 00.1
200 Ω = 00.6

Mosfet position Q8601

Ebay board

―⯈⊢ = S+D=469, S+G=713 D+G=1
200 Ω = S+D=1 S+G=1 D+G=1

Original board (Also faulty)

―⯈⊢ = S+D=469, S+G=713 D+G=1
200 Ω = S+D=1 S+G=1 D+G=1

Resistor position R8601

Ebay board

―⯈⊢ = 00.0
200 Ω = 00.8

Original board (Also faulty)

―⯈⊢ = 00.0
200 Ω = 00.8

Capacitor position C8626

Ebay board

―⯈⊢ = 468
200 Ω = 1

Original board (Also faulty)

―⯈⊢ = Component not present
200 Ω = Component not present

Diode D8609

Ebay board

―⯈⊢ = 068
200 Ω = 68.8

Original board (Also faulty)
―⯈⊢ = 069
200 Ω = 69.0

Integrated circuit position U8601

I did not find a pinout online, so I only report the supposed continuity readings:

Ebay board

Pin 1+4
―⯈⊢ = 684
200 Ω = 00.6

Pin 1+2
―⯈⊢ = 680
200 Ω = 00.6

Pin 2+3

―⯈⊢ = 000
200 Ω =00.6

Pin 2+4

―⯈⊢ = 000
200 Ω =00.6

Pin 3+1

―⯈⊢ = 000
200 Ω =00.6

Pin 3+4

―⯈⊢ = 000
200 Ω =00.5

Pin 5+6

―⯈⊢ = 467
200 Ω =1

Pin 6+8

―⯈⊢ = 723
200 Ω =1

Pin 7+5

―⯈⊢ = 733
200 Ω =1

Pin 7+8

―⯈⊢ = 826
200 Ω =1

Original board (Also faulty)

Pin 1+2

―⯈⊢ = 684
200 Ω = 00.5

Pin 1+4

―⯈⊢ = 659
200 Ω = 00.5

Pin 2+3

―⯈⊢ = 000
200 Ω = 00.5

Pin 2+4

―⯈⊢ = 000
200 Ω = 00.5

Pin 4+5

―⯈⊢ = 549
200 Ω = 1

Pin 5+6

―⯈⊢ = 745
200 Ω = 1

Pin 1+5

―⯈⊢ = 538
200 Ω = 1

Pin 2+5

―⯈⊢ = 553
200 Ω = 1

Pin 3+5

―⯈⊢ = 543
200 Ω = 1

Pin 4+5

―⯈⊢ = 542
200 Ω = 1

Diode D9105

Ebay board

―⯈⊢ = 1
200 Ω = 1

Original board (Also faulty)

―⯈⊢ = 1
200 Ω = 1

SMD resistor R8616

Ebay board

―⯈⊢ = 549
200 Ω = 1

Original board (Also faulty)

―⯈⊢ = 556
200 Ω = 1

SMD resistor R8617

Ebay board

―⯈⊢ = 022
200 Ω = 22.3

Original board (Also faulty)

―⯈⊢ = 022
200 Ω = 22.3

SMD resistor R8618

Ebay board

―⯈⊢ = 047
200 Ω = 47.1

Original board (Also faulty)

―⯈⊢ = 047
200 Ω = 47.1

SMD resistor R8619

Ebay board

―⯈⊢ = 1
200 Ω = 1

Original board (Also faulty)

―⯈⊢ = 1
200 Ω = 1


It would be great if somebody could help me figuring this out


Thanks a lot in advance,

Kind Regards,

S.

[nomoresonys]

Test the mosfets in diode mode: https://www.youtube.com/watch?v=IF740E5bm84

[Sasiccia]

Hi nomoresonys,


I did test all most common fault points including mosfets in diode mode, I've shared my results above, the diode mode is marked as: ―⯈⊢


If you could please help me understanding the readings, as I am not very experienced, that would be amazing,


Thanks a lot!

Kind Regards,

S.

[nomoresonys]

Just follow the video linked in post #23, it's step by step.

[Montse]

Hi all! I had the same issue than Hervé and changed D9105. Since then, the TV turns on, so it's alive again! Nevertheless the screen is in burning mode, so flashing full screen blue, red, green, white, etc in a cycle. I have watched many videos on how to fix this issue but none of them worked for me. Starting the TV after pressing On/Off button for 30 seconds. Press the button for 30 second after it is on already. Tried with all buttons in the remote control but nothing is displayed in the screen besides a full color at the time. I bought a repair kit for this mainboard so I have a few more components to change but as I am far from behing an expert, I prefer to do it step by step and only touch it again when it's necessary and at this point I am not sure if the board still has something damage or I should somehow reset the TV or something like this! Any suggestion/help is much appreciated.

[nomoresonys]

Hi all! I had the same issue than Hervé and changed D9105. Since then, the TV turns on, so it's alive again! Nevertheless the screen is in burning mode, so flashing full screen blue, red, green, white, etc in a cycle. I have watched many videos on how to fix this issue but none of them worked for me. Starting the TV after pressing On/Off button for 30 seconds. Press the button for 30 second after it is on already. Tried with all buttons in the remote control but nothing is displayed in the screen besides a full color at the time. I bought a repair kit for this mainboard so I have a few more components to change but as I am far from behing an expert, I prefer to do it step by step and only touch it again when it's necessary and at this point I am not sure if the board still has something damage or I should somehow reset the TV or something like this! Any suggestion/help is much appreciated.

Try holding the power button on the tv til the tv shuts off, wait one minute, unplug tv from power for 5 minutes then try it.

[Montse]

Following a previous suggestion to Hervou, I was about to replace the mosfet besides the diode D9105 but I realized that the mosfet I have in the kit I purchased is not that one but Q8601. Should I buy that one or taking into account that the screen and ambilight are getting tension I should check something else?
Thanks a lot in advance!
Regards,
Montse

[Montse]

Try holding the power button on the tv til the tv shuts off, wait one minute, unplug tv from power for 5 minutes then try it.

Thanks for your advise! I have tried but the power button does not shut off the TV while holding it. I have tried pushing it a few times and finally it turns off. I waited the minute, unpluged for 5 minutes and it remains the same. I also have disconnected all buses and cleaned them... same result... any other idea?

thanks a lot!

[nomoresonys]

Maybe try unplug it while it's on, wait a minute, hold power button for 30 seconds, plug back in and try it.

[nomoresonys]

They usually aren't too hard to get out of aging mode, wonder if you have to enter service mode on this one to exit aging mode. Must be very careful if you do go into service mode, doing something wrong in there can brick the tv.

[nomoresonys]

Try this if you have not, unplug tv for 5 minutes, hold power button on tv for 30 seconds, it lets everything discharge. Now plug power cord in while holding power button in, when tv comes on let go, wait a minute unplug tv from power, wait a minute then try it.

[Montse]

They usually aren't too hard to get out of aging mode, wonder if you have to enter service mode on this one to exit aging mode. Must be very careful if you do go into service mode, doing something wrong in there can brick the tv.

hmmm... so far nothing is working... how can I get into service mode in this Philips? Any idea? When I press any key in the remote control I can see the led blinking like there is reception but does nothing. Is there any specific sequence to get to the service mode?

Thanks a lot for all your help!

[Montse]

Thanks for your advise! I have tried but the power button does not shut off the TV while holding it. I have tried pushing it a few times and finally it turns off. I waited the minute, unpluged for 5 minutes and it remains the same. I also have disconnected all buses and cleaned them... same result... any other idea?

thanks a lot!

I just have found the sequence 062596 and OK but it also does nothing....

[nomoresonys]

Wondering if this model updates without any remote clicks needed, if so you may be able to update the firmware thru a usb drive. Any Philips pros looking on?

[nomoresonys]

Guess I'm missing something, it seems like it should be simple to get out of this mode but the usual methods don't seem to work, I'm stumped.

[William1967]

The tv has an so called OPEN CELL panel/t-con, it goes in WBRG mode when there is 12V on the t-con but no data from the mainboard. Check the LVDS cable if there is no damage and check if there is data comming from the mainboard.

[angelos]

The tv has an so called OPEN CELL panel/t-con, it goes in WBRG mode when there is 12V on the t-con but no data from the mainboard. Check the LVDS cable if there is no damage and check if there is data comming from the mainboard.

That's right what William1967 says. Sometimes you need to clean the LVDS cable on both ends as well as the connectors. I use benzene.

[nomoresonys]

That's good info. so it may be a mainboard issue. How to determine, should check anything on mainboard to try and narrow down to issue??

[Montse]

The tv has an so called OPEN CELL panel/t-con, it goes in WBRG mode when there is 12V on the t-con but no data from the mainboard. Check the LVDS cable if there is no damage and check if there is data comming from the mainboard.

OK, my Tcon is a LG v15 43UHD TM120 ver 0.4, P/N: 6870C-0552A. I attach a picture. I have disconnected all buses and cleaned them with an eraser (previously with the spray CRC 2-26 electro). Situation remains the same. What should I check in this board to ensure it gets data? I find it difficult to use the tester with all those pins so close to each other!