Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

[Tyrmas]

Hi all!

A few days ago my TV suddenly turned off while watching Netflix from my media PC. Only connected cables were HDMI and TOSLINK. It immediately started doing this loop where the power led turns on for a second and then turns off. You can also hear a click inside the TV every time.

I tried the easy stuff first like disconnecting everything including the power cord but that didn't fix the issue.

Now I opened the TV to check if there are any bad capacitors but as far as I can tell, they look okay.

I've attached a few pictures and a video (.zip-file) where you can hear the click and see the led. There's also a close up picture of what I think makes the clicking sound. I can't find this part sold separately anywhere and I'm not sure what that component is called..?

So.. Is there a possibility that this clicking is caused by some other failing component and the component I think is clicking is still OK?

I haven't measured any voltages yet and I'm not quite sure where to begin at this point. I'm writing this on my lunch break so it'll be a while until I get to work on it again. If I'm missing any crucial information, please let me know.

Thank you in advance for your help.

[Maalobs]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

You can download the service manual from this page:
https://www.electronica-pt.com/esque...ileinfo/66102/
This chassis is used in several models, so use Table 2-1 to identify the sections that are unique to your model.

Chapter 5 is what you want to study, it covers fault finding.
In your particular case, I'd try unplugging the backlight, Ambilight, TCON-board, etc, and see if I can isolate the problem to a specific module.
Also see if the behaviour changes if you have nothing connected to the powerboard except mains power.

If you are left with only the powerboard and systemboard connected and the problem persists, hopefully it's a problem related to the powerboard.
If not, you might have a heatwarped PCB where the main processor BGA-chip has lost connection to some of the underlying pads.
I've noticed that they never mention BGA-reflow as a possible solution.

The "standby controller" is a microcontroller which is integrated into the main processor chip, and in this case it's not running so you have a fundamental problem with either power or the chip's connectivity.
You are consequently not even entering the standby state and that error is not covered in the fault finding checklist, so you'll have to go by your wit.

[Tyrmas]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

Thanks a lot for the service manual and tips!

I checked everything and when I unplug the SSB board (or what I called main logic board..) clicking stopped. TV was completely silent until I plugged in that board.

I then went and removed all the cables from SSB board one by one (speaker wires etc, excluding the one between PSU and SSB) and after removing the flat cable (CN408?) the panel lit up and no more clicking. That cable goes to the IR/LED board I think.

I gotta spent some time reading the service manual. Not quite sure what to do next but at least I got a lot closer.

If nothing else, I have a wicked 58" led lamp..

[William1967]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

Check if the power regulator is soldered correct, it's a problem i've seen before.

[Davi.p]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

It's not correct, when the standby led flashes the standby mpu is fully working, this ussually brings to a working psu and non working main board, first you have to follow manual on how to activate SDM and see level 2 error code, then test psu outputs VS main board...

[Maalobs]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

Is it a blinking pattern, though?
If I understand his description correctly, the TV is stuck in a loop where the power turns on momentarily and the power LED lights up, then the TV immediately turns off again to the sound of a click, then the loop repeats.
The power LED lights up immediately on my Philips TV when I power it on from the remote control or plug in mains power, so I'd expect that as normal.

I suppose you are right about the standby processor running correctly then and that could be a relief not having to deal with a BGA-reflow.
What about this clicking business?
It won't be possible to measure power rails if the device keeps powercycling.
Tyrmas; Unplug the mains power and do a resistance measurement on each power rail on both the powerboard and the SSB against GND, to check that there is no short circuit somewhere that forces this behaviour.

The service manual has no mention of achieving a hardware SDM, only by software while in the SAM menu, in section 5.2.2:

Press the following key sequence on the remote control transmitter: "062596"
directly followed by the "Menu/Home" button to switch to SDM (do not allow the
display to time out between entries while keying the sequence).

I assume you wanted all power rails to be forced enabled so he can measure the voltages on each rail even in protection state, but if the device is already fully booting so you can operate the SAM menu then all rails are already on, so how did Philips think this would be useful?

Also, section 5.6.3 says that the layer-2 errors become visible when CSM has been activated, which is the read-only software service menu.
Table 5-4 is the error code table for layer-2 errors, and this is the entire content of the table:

Layer-2 error code  Defective device
13          General I2C bus error on the SSB
16          +12 V missing or low, PSU defective
27          Channel decoder error on the SSB
34          Tuner I2C bus error on the SSB
35          EEPROM I2C error on SSB, M24C64

Not exactly a comprehensive list, and just like with the SDM, it sounds like circular logic to require a fully bootable device to enable the mode where pre-boot error-codes will tell me why the device is not booting.

[Davi.p]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

Sorry i misread a little pass of Tyrmas, so by disconnecting the led/ir pcb and maybe also button pcb, the short circuit go away, but to be more precise watch the manual at p.38 and tell me exactly which cable you disconnect. But the only flat cable in main board is the tcon cable so it can be broken that board.

[Tyrmas]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

Check if the power regulator is soldered correct, it's a problem i've seen before.

Thanks for the suggestion. I checked and it seems to be fine.

Is it a blinking pattern, though?
If I understand his description correctly, the TV is stuck in a loop where the power turns on momentarily and the power LED lights up, then the TV immediately turns off again to the sound of a click, then the loop repeats.

Doesn't seem to be a blinking pattern. It's exactly like you described.

Unplug the mains power and do a resistance measurement on each power rail on both the powerboard and the SSB against GND, to check that there is no short circuit somewhere that forces this behaviour.

Just tried to measure continuity between GND and some power rails but seemed to be OK so far. No beeping.

Sorry i misread a little pass of Tyrmas, so by disconnecting the led/ir pcb and maybe also button pcb, the short circuit go away, but to be more precise watch the manual at p.38 and tell me exactly which cable you disconnect. If i read well in this model SDM is entered by remote, also by standby, if not it is unuseful.

The button PCB doesn't seem to have any effect. And I think I actually made a mistake earlier. It's most likely not the IR/LED board cable I unplugged, I think I just got confused looking at the picture from the manual that I've now attached.

Red arrows show which cable I removed. By removing that cable, the panel lights up like I described earlier and the clicking noise is gone.

Now the blue line I drew is where I probably got confused. I thought IR/LED board and the pcb behind that cover were one thing. I have now removed the cover and yeah, should've realized this before. The LED-part somehow made me think about the panel... So the PCB behind that cover is what causes this issue. I attached a picture of it too. I also tried to remove the smaller white cable from the board (next to the one I removed) but that didn't do anything.

Really sorry for the confusion! I really shouldn't use my lunch breaks on this.

[Davi.p]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

Ok as my last post edit the fault is in the tcon or the panel, now things get harder cause you don't have schematics on that, i don't have a pc now, i can't edit the photo of where to test, so make a magnified photo of the left part of it where there are grey squares and i can read the silkscreens, or simply test in diode mode all Qxx , Dxx components to find a short...

[Tyrmas]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

I attached a few pics. I hope they are okay. Lighting is a bit awkward, sorry for that.

I'm going to check the components tomorrow if I have time.

[Davi.p]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

up2 has also to be tested, for short, in 3,3v, out 2,5v,

[tiki66]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

Check fuse and then check all SMD capacitors on tcon board, maybe some of them are in short circuit

[Tyrmas]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

Finally got time to get back to this. I've spent a few days trying to find shorts or get some readings but no luck.

I can't seem to get any voltage readings from the tcon board. I get around 0.1-0.5 volts before the TV reboots (for example on up2 in). If I remove the tcon cable so that the TV stays on I get basically nothing. I also removed the two flat cables going to the panel and that doesn't change anything so I think it's safe to say that the panel is working. What I find weird is that I can't find any shorts with continuity testing.

PSU outputs correct voltage everywhere.

I checked that new(?) working tcon board costs around 15€ so I might just order one and see how that goes unless there's something else to test.

[Tyrmas]

Re: Philips 58PUS6809/12 doesn't turn on - LED turns on for a second and TV clicks

I hope I don't get in trouble because I reply to my month old thread, but I managed to fix the TV so I believe it's fine since someone might be able to get something out of this. Also, the replacement tcon board came yesterday so there wasn't really anything to update before that.

As you can guess, I wasn't really able to replace any components or anything since the "bootloop" made it impossible (at least for me) to get any voltage readings and I couldn't find shorts anywhere. So I bought a replacement tcon board.

I just replaced the tcon board and the TV works again. No issues. So while I was able to pinpoint which board caused the issue (with some help), I couldn't fix it the way I would've liked.

Thank you all for helping me!