Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V.1

[Folxs]

Hi, I have Philips LED TV 32PFL3008K/12 that blinks 10 times and doesn't turn on.
It is cheapo VESTEL made TV.

I measured all the diodes on power supply, some voltages and they are ok, I suspect mainboard - but there are so many variants of firmware so I need some help to find right one.

There are NAND 28F1G08ABAEA (U13) and 25L1606E (U10)
LCD Panel is VES315WNDB-01 (more info on sticker)

Can I maybe reflash NAND from USB?
I can also write on 25L1606E - I have TL866A programmer

[Andrew F. Ali]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

What made you guss Main bd. Did you do any voltage measurements, etc??

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

Yes, on main connector PL200:
PIN 5 24V
PIN 7 12V
PIN 11 5V
PIN 15 3.2V
PIN 17 0V
PIN 19 24V

PL501 (LCD Supply) 24V is OK

Also whole system takes about 12W from wall (I have Power meter)

PL201
PIN 1 3.2V
GND OK
24V OK

[Andrew F. Ali]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

From what I see here your Main Bd. is working. I didn't see a pin labeled PS-ON, but I am guessing here that this is working as the other PSU derived voltages are present. On the other hand you could be right as the software could be corrupt and causing the no-start-up issue. Did you test the backlights to see if they are faulting the system?

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

I think that this ST_BY have role of PS-ON

[dick_barton]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

I think its pin 17, ST_BY active low.

[Andrew F. Ali]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

Yes, I think so too. Any testing of the Backlights?

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

I think its pin 17, ST_BY active low.

so, ground the signal down to see what will happen?

Yes, I think so too. Any testing of the Backlights?

not yet - is there converter inside the panel?

[Andrew F. Ali]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

No. From what I interpret the Red ad Black wires go to the backlights directly from the PSU. Is this correct??

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

No. From what I interpret the Red ad Black wires go to the backlights directly from the PSU. Is this correct??

Yes

[Andrew F. Ali]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

With the set off connect the RED probe of the DMM to the red wire and the BLACK probe to the chassis GND. Turn on the set and record your findings. Take the set off and attach the RED probe of the DMM to the black wire and the BLACK probe to the chassis GND. Turn on the set and record your findings. Report your findings.

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

On red wire:
When I tries to turn on TV voltage is ramping to 46.3V and alowly goes down to 0V
On black wire:
Ramping to 100V and slowly goes down to 0V

[Andrew F. Ali]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

That's 53.7V difference between them. Looks OK, unless there is a shorting LED that is trying to pull a larger current and shutting down the LED Driver. Well you have another Main Bd. with Driver on the way. Try that and maybe it would work.

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

So now You suggest to check all LEDs?

[budm]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

https://www.ebay.ie/itm/2-X-STRIP-LE...W/112676310576
Base on your panel model number provided, it looks like it has two LED strips with 22 LEDs total.
The supply Voltage went up to 100V (which is the maximum Voltage rating of the Boostconverter output filter caps C514, C515 which means the power supply is not seeing the load so it goes into OVP shutdown.
The Cathode return of the LED string goes to GND via PIN11 (LED 1) of the IC 500.
So it can be that the LED string has open circuit some where, or the LED 1 pin is not PWM on. Having the LED tester will be good to have at this point.

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

Ok, I will check the diodes tomorrow - thanks for advice!

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

I couldn't fall asleep - one LED was burned open, I installed LED from other TV and now everything is working fine

[budm]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

Thanks for the follow-up, make sure to turn down backlights level to as low as possible for all inputs.

[Folxs]

Re: Blinking 10x Philips 32PFL3008K/12 - VESTEL 17MB95-2.1 and 17IPS19-5 17IPS19-5P V

I will