Polaroid P40LED13 powers up then shuts down

[london-freddie]

just saved another tv from the tip, and again asking for help to fix it
Polaroid P40LED13
Vestel boards
Power board 17IPS20
When TV is powered up it starts up normally with a picture, after about 5 seconds it shuts down then restarts and shuts down as if in a loop
Just taken the back off nothing obvious standing out as a fault
I suspect power board fault but may be wrong, you guys know a lot more than me.
or is it possible for a failing led on the backlight to cause this.
will post pictures of boards in a few mins as soon as i get them off phone onto computer

[ReeceyBurger123]

Re: Polaroid P40LED13 powers up then shuts down

Hey before I help can you update some of your other threads ? Also you watched my 17MB82-2 repair video ? Also this is not a Psu failure its the firmware at fault or an Led failure. I can link repair video if you want.

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

P40LED13 Pics

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

back of power board

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

think all my other threads were updated will check them

[ReeceyBurger123]

Re: Polaroid P40LED13 powers up then shuts down

Here is a link to the repair video should fix the fault:

https://m.youtube.com/watch?v=kPCisa9BYkk

Check on google for 17mb82 core update folder to download it then follow video.

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

is there any way of checking backlight leds without dismantling screen and checking each led in turn

[ReeceyBurger123]

Re: Polaroid P40LED13 powers up then shuts down

Backlights wont cause the set to trip honestly your mb is at fault for sure.

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

update !!!! downloaded core update onto usb, reloaded and tv has started up and seems to be working ok, not checked HDMI etc yet but tv is staying on now. Only thing I have noticed up to now is the on screen menu is different. Thanks Reece

[ReeceyBurger123]

Re: Polaroid P40LED13 powers up then shuts down

Yay nice nice, now factory reset it though the menu and reinstall the whole lot. Then turn the backlight down to low to stop the Leds burning out. Also yes the menu will be different as its an updated one with less boot up glitches.

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

Bit premature I still have a problem with this TV
Just caught it but after some time on maybe 15 20 minutes the tv is loosing its picture as shown in photo, speakers make a loud shrieking noise then it shuts down and reboots again working.
I have done a factory reset from menu, turned backlight and brightness down,and also rebooted from usb update again, still shutting down after some time
Could this still be software or some other problem.
When is on seems fine picture is good

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

pics showing tv working and at point of shutdown

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

i am thinking some component getting hot and shutting it down ???

[ReeceyBurger123]

Re: Polaroid P40LED13 powers up then shuts down

The Cpu might be overheating has it got the thermal pad under it ? I had one where someone removed the Cpu cooling pad causing the set to shutdown as the Cpu got too hot. Also check all screws are in and wires tightly pushed in.

[ReeceyBurger123]

Re: Polaroid P40LED13 powers up then shuts down

Heres one I did, the thermal pad was removed under the Pcb so I replaced that and adding a heatsink to the chip too. It gets hot and with no thermal pad it will overheat and crash the set.

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

will try adding a heatsink now

[ReeceyBurger123]

Re: Polaroid P40LED13 powers up then shuts down

Use silicon thermal plaster to mount it. Before though check if there is a thermal pad under the board.

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

refitted thermal pad under board and fitted a heatsink on top of chip with thermal paste, still shutting down after 10 15 minutes

[vinceroger69]

Re: Polaroid P40LED13 powers up then shuts down

can you isolate what part/area is causing it too shut down using heat or freeze spray

[london-freddie]

Re: Polaroid P40LED13 powers up then shuts down

hi have just been applying heat from hairdryer over boards not created a shutdown, tv is on now just waiting for it to shutdown when it feels like it