17IPS19-5 LED TV does not start (Flashing Standby)

[MrSnow]

Hi Guys,
I have a problem with my 32 inch LED TV. It does not start and only the red StandBy LED is flashing.

At the connection of the backlight on the black pin is only 24V, at the red pin 0V. No diode is broken. The backlight LED works if I connect a laboratory power supply. Freezing of U10 and U12 did not work.

I have attached an image with the measured voltages. It would be great if someone could help me.

Thank you very much

Power supply: 17IPS19-5
Mainboard: 17MB82S-1a

[ReeceyBurger123]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Right, download core update for mb82 and watch my video showing how to do it. Problem solved.

[vinceroger69]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

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

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Hello, I watched the Video and downloaded the core Update already. The TV does not respond at the USB Flash.

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Hi again,

another Idea?

[ReeceyBurger123]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

With the mb removed do you get the 24v and 12v on one side of the diodes ?

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Hello, without mainboard:
The three 12V diodes: 12V
The three 24V diodes start at 24V and then sink slowly to 0V.

[ReeceyBurger123]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Well there is a fault on the smp then, have you checked the Led drive area like the mosfet and that for short circuits ?

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Hello, not yet.
What does smp meaning?
Mosfet? Q204? How do I measure it?

Sorry, but I'm not a pro :-)

Thanks

[dick_barton]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

What is the voltage between the 2 legs of C116. It should be around 380V. Place your meter probes on each leg of the capacitor.

[dick_barton]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Hello, not yet.
What does smp meaning?
Mosfet? Q204? How do I measure it?

Sorry, but I'm not a pro :-)

Thanks

smp = switch mode power supply

Put your meter in diode mode and check D203, D207 and the one along side it. Take a reading with meter probes on each side of the diode and a second reading after reversing the leads. Post the readings.

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

What is the voltage between the 2 legs of C116. It should be around 380V. Place your meter probes on each leg of the capacitor.

Hi,
C116 and C117 320V DC.

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

smp = switch mode power supply

Put your meter in diode mode and check D203, D207 and the one along side it. Take a reading with meter probes on each side of the diode and a second reading after reversing the leads. Post the readings.

Hi!

D203: black anode, red cathode = Impermeable (or leaktight (dont know the english word))
D203: black cathode, red anode = 0,562 V

D206,D207: black anode, red cathode = leaktight
D206,D207: black cathode, red anode = 0,389 V

D506: black anode, red cathode = leaktight
D506: black cathode, red anode = 0,423 V

D318,D319,D320: black cathode, red anode = 0,213 V
D318,D319,D320: black anode, red cathode = 0,837 V

[dick_barton]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

It should be around 380V.

What voltage do you have between pins 1 & 7 of IC201. Meter set to DC volts and measure with care so as not to short out any other pins.
Pin 1 often has a dimple in the top of the IC alongside it and the pin numbers go anticlockwise around the chip.

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Without Mainboard (i had to turn the power supply): 15,2V.
Thanks

[dick_barton]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

According to the data sheet IC201 (PWM controller IC) has a minimum startup voltage of 14.5V with typical 15.5V so it looks as though that IC is OK.

Check the following components with your meter in ohms or Kohms range
R211, R210, R220, R272, R212

Also with meter in diode mode
D202, D208, D206, D207, D201, D209 (if in circuit)

Finally check Q203, Q204

https://www.youtube.com/watch?v=gzh8ICLMXzQ

https://www.youtube.com/watch?v=RkWy1EirEu8

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Thank you. I'll check it in an hour.

[dick_barton]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

D203: black anode, red cathode = Impermeable (or leaktight (dont know the english word))
D203: black cathode, red anode = 0,562 V

Pass - OK

D206,D207: black anode, red cathode = leaktight 
D206,D207: black cathode, red anode = 0,389 V

Pass - OK

D506: black anode, red cathode = leaktight 
D506: black cathode, red anode = 0,423 V

Pass - OK


D318,D319,D320: black cathode, red anode = 0,213 V
D318,D319,D320: black anode, red cathode = 0,837 V[/QUOTE]

They are probably OK because you have the 12V supply.

[MrSnow]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

D318,319,320 I had already soldered. All OK.
The resistors have to solder, too?
--
What about the LED driver IC (3394)? At the background connection the voltage is missing

[dick_barton]

Re: 17IPS19-5 LED TV does not start (Flashing Standby)

Hello, without mainboard:
The three 12V diodes: 12V
The three 24V diodes start at 24V and then sink slowly to 0V.

When the mainboard is connected to the power supply, is the 24V steady or still falling to 0V

What voltage do you have at each side of D505 & D506