Philips TV keeps restarting, is this MB the same as mine please?

[Maalobs]

Re: Philips TV keeps restarting, is this MB the same as mine please?

The service manual that covers your model can be downloaded from this page.
The service manual is for a chassis that is shared among several models, so refer to Table 2-1 to find the diagrams and schematics that are specific to your particular model.
Other than that, focus on chapter 5.

There is no hardware SDM in this model, in section 5.2.2 it says:

In this platform, a simplified SDM is introduced (without protection override [...])

There is also no table that explains the "blinking LED" diagnostics, even though there is a section "5.6 The Blinking LED Procedure".
It might be that either section 5.6 is a copy/paste mistake and should not have been included in this service manual, or that the table was mistakenly omitted.

Regarding the boot-cycling; if you plug in mains power and just let the TV be for several minutes, does it eventually start blinking the power LED?
The boot-cycling might be a symptom of a number of retries in the boot-process, and if you let it run until the maximum allowed retries have been reached, the TV might fall into a protection mode and start blinking the LED.

If you have the ability to read the TX from the Standby controller UART and from the MIPS (main processor) UART, maybe there is information about what is going wrong in the boot-process.

--------------------------------

show us the print chart of this socket CN9101

Were you looking for this?

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

show us the print chart of this socket CN9101

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

try this, plug everything back in power it up, check voltages on CN9101, what are they and do they fluctuate?

here are the measurements please check the pic below, they don't fluctuate thank you (negative probe was on the chassis)

[nomoresonys]

Re: Philips TV keeps restarting, is this MB the same as mine please?

try this, plug everything back in power it up, check voltages on CN9101, what are they and do they fluctuate?

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

Ok I unplugged the connector, here are the values:

1) with the positive probe on LED1+ :
0v on all the 4 LED1- points

2) with the negative probe on the chassis
0.9v on all the 4 LED1- points

[nomoresonys]

Re: Philips TV keeps restarting, is this MB the same as mine please?

doesn't look right at all, try this, unplug backlight cable, and recheck the pins on connector on the board.

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

Thanks nomoresonys I'll make sure to check all of this.

I made the measurements again, 2 ways:

1) with the positive probe on LED1+ :
Depending on what's on the screen (nothing, logo, or plain light) all the 4 LED1- points go from 0v then 32v then 35v then 37v then stabilize at 39V

2) with the negative probe on the chassis
The 4 LED1- points go from 0v then 8v 10v 15v and stabilize at 6.5v

All these values cycle while the tv starts over and over again

[nomoresonys]

Re: Philips TV keeps restarting, is this MB the same as mine please?

easy thinks first, I usually start with top of board, checking all diodes and resistors and checking all solder joints on bottom of board, those for starters, examples of bad solder joints there: https://www.google.com/search?q=bad+...ih=607&dpr=1.5

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

i did explain this to you at my post#11 so ab to you.

thanks, I'm going to take these measurements again, hold on please

maybe better start from the start, check the voltages at the connector on powerboard where cable from powerboard to mainboard plugs in, check in standby[tv plugged in but off] leave probes in place, power on tv take note of both conditions, this is to see if the mainboard is sending all the proper signals to the powerboard. good video example of testing there: https://www.youtube.com/watch?v=ocqnqmBxiqY

The TV can't be put on off, I have to unplug it so it turns off.
And it starts right away as soon as I lug it back.
The on/off switch became useless...

Ok let me make Diash's measurement again

[nomoresonys]

Re: Philips TV keeps restarting, is this MB the same as mine please?

because it seems like strange things are happening, indicator light was there now it's gone, so I would start from the start.

[nomoresonys]

Re: Philips TV keeps restarting, is this MB the same as mine please?

maybe better start from the start, check the voltages at the connector on powerboard where cable from powerboard to mainboard plugs in, check in standby[tv plugged in but off] leave probes in place, power on tv take note of both conditions, this is to see if the mainboard is sending all the proper signals to the powerboard. good video example of testing there: https://www.youtube.com/watch?v=ocqnqmBxiqY

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

but since the logo displays well, doesnt it mean the LCD leds are fine?

i did explain this to you at my post#11 so ab to you.

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

keep in mind if you take the screen apart, the tv will work with out screen and the BL will turn on so easy to see if one bad or not.

edit: yours screen just 40 size lol.. i took alone 85 size with out damage.

ok I'll try to disassemble everything tomorrow then, after rewatching videos on yt to see how to do it so I don't break everything.

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

but since the logo displays well, doesnt it mean the LCD leds are fine?

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

keep in mind if you take the screen apart, the tv will work with out screen and the BL will turn on so easy to see if one bad or not.

edit: yours screen just 40 size lol.. i took alone 85 size with out damage.

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

If I need to ckeck the LCD panel where are led strips I think it's a massive task to open the whole TV to access this. I've seen videos on yt about replacing led strips, it's tough...
You need me to do this?

[nomoresonys]

Re: Philips TV keeps restarting, is this MB the same as mine please?

yes, i was thinking those backlight readings were a little strange but wasn't sure.

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

I thought you need me to check the led on the front panel at the bottom (the little red led that turns on when the tv start) but I'm reading your post and I'm not sure if you need me to check this or something else?
Btw I have no more red light when the tv turns on, it disappeared too

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

hahaha.. i never lei and here too the issue its not MB.. dont buy.. only mistake i did about csm.. it should be test point on MB SDM... realy i hate philips.. but 40 size as his TV from 2013 the LED BL will be edge not direct.. if they are edge the messuremnts he did not enough to drive 6V double LED as philips used and as i know.

so the questiones to OP yours tV used edege BL or direct.. edge mean the LED strips at the buttom of the screen.. direct BL mean the LED direct behind the screen as many strips.

I'm glad I didnt buy the MB then, thanks !
Let me make a picture of the bottom of the screen. I'm going to try to open it too to photograph the inside, wait a bit please thank youuuuu

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

he hasn't lied to me yet.

hahaha.. i never lei and here too the issue its not MB.. dont buy.. only mistake i did about csm.. it should be test point on MB SDM... realy i hate philips.. but 40 size as his TV from 2013 the LED BL will be edge not direct.. if they are edge the messuremnts he did not enough to drive 6V double LED as philips used and as i know.

so the questiones to OP yours tV used edege BL or direct.. edge mean the LED strips at the buttom of the screen.. direct BL mean the LED direct behind the screen as many strips.