Soniq E40W13C-AU TV Stuck on standby

[Lemuel]

Re: Soniq E40W13C-AU TV Stuck on standby

Hey guys,

my TV has the same problem. ausvantage which one of the three voltage regulators did you end up replacing? and do you still have the spare ones?

Is your TV still working?

Cheers

[ausvantage]

Re: Soniq E40W13C-AU TV Stuck on standby

The tv I picked up was stuck in standby . I replaced the same voltage regulator as described above. The type I replaced it with was ams1117 adj ht2438 got about 10 of them delivered for $3 .
Tv works perfect now no other issues at this stage. If anyone needs these regulators I have many spares.
Thanks immensely to the above contributors that made this fix easy.

Cheers

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

Hi I've checked all the other regulators including the one I replaced. All seem to be showing the correct voltages. I'm gonna try and replace the caps on the main board. See if that helps.

[stj]

Re: Soniq E40W13C-AU TV Stuck on standby

maybe check the other regulators incase one is overheating

infact maybe your replacement is bad because something is overloading it?

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

I think I'll closed this thread as the original problem was solved. The TV is no longer stuck on standby and the fix was to replace a faulty ADJ LDO on the main board. Thanks budm for your assistance.

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

No the menu does not seem to work at all. The problem has evolved, if you can say that, so instead of bad picture, the TV just keeps on restarting. So it will turn on, picture is good, then restart.

[stj]

Re: Soniq E40W13C-AU TV Stuck on standby

when it does that, do the osd menu's still work?

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

Sorry does anyone have any idea what I should test or have a solution for this problem? Thanks you.

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

Hi Budm, thanks for your advice I replaced the ADJ LDO IC and the TV finally turns on. It behaves while no input is in but when I plugged in the chromecast, it behaves for about 5 second and then the image is distorted. Please refer to the pictures. Thanks

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

Cheers thanks budm. I've ordered the part and will update you on the result.

[budm]

Re: Soniq E40W13C-AU TV Stuck on standby

Good, go ahead and replace that ADJ LDO IC with the 0.79VDC output then. I would get more than one in case it gets damaged.

'GND - 3 = Increase / decrese in ohms (possibly due to the capacitor it is attached to?)' Can be due to some left over Voltage that the caps did not completely discharged.
It is good to always check when the readings do not make sense, you can use Ohms law to see that what you are seeing is impossible.

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

BM1117-3.3 (voltage Regulator Number 1)

Between GND - Pin 1 = 0V
GND - Pin 2 = 3.295 V
GND - Pin 3 = 5.17 V

Between GND - 1 = 0 Ohms
GND - 2 = 341 ohms
GND - 3 = 4 Ohms

BM1117-ADJ (voltage Regulator Number 2)

Assuming pins are numbered left to right:
Between GND - Pin 1 = 141.4 mV
GND - Pin 2 = 0.790 V
GND - Pin 3 = 5.18 V

Between GND - 1 = 102 Ohms
GND - 2 = 454 ohms
GND - 3 = 1k Ohms
OK, one thing for sure is that the one with 0.79V output on pin 3 is not right so I would replace it.
But the other one that shows 5.17VDC on pin 3 but it has 4 ohms to GND, that has to be error in resistance reading since @5.17V with 4 Ohms you are talking about 1.3A of current with >6 Watts of power dissipation! That has to be an error.

I think you're right I double checked it again with 2 multimeters and the results are:

BM1117-3.3 (voltage Regulator Number 1)

Between GND - 1 = 0 Ohms
GND - 2 = 341 ohms
GND - 3 = Increase / decrese in ohms (possibly due to the capacitor it is attached to?)

[budm]

Re: Soniq E40W13C-AU TV Stuck on standby

BM1117-3.3 (voltage Regulator Number 1)

Between GND - Pin 1 = 0V
GND - Pin 2 = 3.295 V
GND - Pin 3 = 5.17 V

Between GND - 1 = 0 Ohms
GND - 2 = 341 ohms
GND - 3 = 4 Ohms

BM1117-ADJ (voltage Regulator Number 2)

Assuming pins are numbered left to right:
Between GND - Pin 1 = 141.4 mV
GND - Pin 2 = 0.790 V
GND - Pin 3 = 5.18 V

Between GND - 1 = 102 Ohms
GND - 2 = 454 ohms
GND - 3 = 1k Ohms
OK, one thing for sure is that the one with 0.79V output on pin 3 is not right so I would replace it.
But the other one that shows 5.17VDC on pin 3 but it has 4 ohms to GND, that has to be error in resistance reading since @5.17V with 4 Ohms you are talking about 1.3A of current with >6 Watts of power dissipation! That has to be an error.

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

"Between GND - 1 = 0 Ohms
GND - 2 = 341 ohms
GND - 3 = 4 Ohms"
This one does not look right, it is showing that the input pin has only 4 Ohms of resistance. Is this the one that has pin 2 output of 0.79V but pin 3 input pin has 5V input?
I would remove it and then do the resistance testing again on the pads of the board where the IC was soldered to see if the low resistance will go away.
Either one of those two will work as long as they are adjustable type.

No thats the other one. Below is the overall findings so far

BM1117-3.3 (voltage Regulator Number 1)

Between GND - Pin 1 = 0V
GND - Pin 2 = 3.295 V
GND - Pin 3 = 5.17 V

Between GND - 1 = 0 Ohms
GND - 2 = 341 ohms
GND - 3 = 4 Ohms

BM1117-ADJ (voltage Regulator Number 2)

Assuming pins are numbered left to right:
Between GND - Pin 1 = 141.4 mV
GND - Pin 2 = 0.790 V
GND - Pin 3 = 5.18 V

Between GND - 1 = 102 Ohms
GND - 2 = 454 ohms
GND - 3 = 1k Ohms

[budm]

Re: Soniq E40W13C-AU TV Stuck on standby

"Between GND - 1 = 0 Ohms
GND - 2 = 341 ohms
GND - 3 = 4 Ohms"
This one does not look right, it is showing that the input pin has only 4 Ohms of resistance. Is this the one that has pin 2 output of 0.79V but pin 3 input pin has 5V input?
I would remove it and then do the resistance testing again on the pads of the board where the IC was soldered to see if the low resistance will go away.
Either one of those two will work as long as they are adjustable type.

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

Hi budm, thank you for your assistance. I measured the resistance as you have suggested and here are the results:

Voltage Regulator 1 (shown in picture 1)

Assuming pin number from left to right.

Between GND - 1 = 0 Ohms
GND - 2 = 341 ohms
GND - 3 = 4 Ohms

I have also checked the capacitor, with a multimeter set to ohms, that is connected directly to Pin 3 and it seems to be charging and discharging fine.

Voltage Regulator 2 (shown in picture 2)

Between GND - 1 = 102 Ohms
GND - 2 = 454 ohms
GND - 3 = 1k Ohms

So because of these results are they faulty?

If so I can't seem to find any supplier in Australia for the BM1117 series, can I use the LM1117 series instead?

Their datasheet:

BM117


LM1117


They both have similar specs except the LM1117 series has a max output current of 1.5A.

[budm]

Re: Soniq E40W13C-AU TV Stuck on standby

"Between GND - Pin 1 = 141.4 mV
GND - Pin 2 = 0.790 V
GND - Pin 3 = 5.18 V"

So you have 5V at the input pin, and 0.79V at the ADJ pin, so if the IC is OK then you should have .141V +1.25Vref = 1.39VDC at pin 2, so you do have bad regulator since you are getting only 0.79VDC. You should take the resistance reading (no AC to the TV of course) between pin 2 and Ground to see if it shows low resistance, it can also have bad filter cap that is connected to pin 2 so you need to check that also.

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

Hi, my name is Cherry. I am new here. Nice to see you. I am from China. And now I am working in an electronics company named NOD Electronics.

Hi I think you posted this in the wrong thread. There's a welcome thread for new members.

[CherryNOD]

Re: Soniq E40W13C-AU TV Stuck on standby

Hi, my name is Cherry. I am new here. Nice to see you. I am from China. And now I am working in an electronics company named NOD Electronics.

[zantesu]

Re: Soniq E40W13C-AU TV Stuck on standby

So I did what you said, and the backlight and screen turned on (and stayed on). However, nothing came up on screen.

It seems I'm still stuck on standby because the red LED at the front of the TV did not change; it just stayed lit up the whole time even though I was pressing buttons on the remote and the controls on the side of the tv.

I also measured the voltages across that discoloured voltage regulator (BM1117 - ADJ) and these are my findings.

Assuming pins are numbered left to right:
Between GND - Pin 1 = 141.4 mV
GND - Pin 2 = 0.790 V
GND - Pin 3 = 5.18 V

I also measured the other voltage regulator (BM1117 - 3.3)
Assuming pins are numbered left to right:
Between GND - Pin 1 = 0V
GND - Pin 2 = 3.295 V
GND - Pin 3 = 5.17 V

Not sure if the both info would help. What should I look at next?

Thanks