Telefunken TE32182B29C10

[Bobo360]

Re: Telefunken TE32182B29C10

Thanks for all of your help.

I decided to change the mainboard. Now the TV works fine.

Thanks again.

[Bobo360]

Re: Telefunken TE32182B29C10

pin120 and 121 connected to gnd : cpu shorted : cpu die : replace cpu or change mainboard.

OK thanks.

you made me understand.

CPU is U14. right?

[arizanotlari]

Re: Telefunken TE32182B29C10

pin120 and 121 connected to gnd : cpu shorted : cpu die : replace cpu or change mainboard.

[Bobo360]

Re: Telefunken TE32182B29C10

how can i verify that is the CPU?

[Bobo360]

Re: Telefunken TE32182B29C10

i think cpu is die.

MT5820LUNU,

Pin 120, 121 are connected to GND.

I guess it's not normal.

What are you saying?

[arizanotlari]

Re: Telefunken TE32182B29C10

Thanks for your suggestions. I just removed U49 and the short circuit between 5vcc and gnd is gone. But the pins of U49, 2 and 4 are always in Gnd. What do I do? Ps: I hope to remember where the capacitors were placed. Ps2: so I found that U49 was broken since now 5vcc is not at Gnd?

i think cpu is die.

[Bobo360]

Re: Telefunken TE32182B29C10

With U49 you no longer have a short on 5V_VCC, that is good.

Without U49 I no longer have the 5V_CC short circuit.

Can you check the pins of U49 to se if the internal fets are shorted?

someone yes, between the right and the left.

With U49 removed, Do you stll have a short on the board where pins 2 and 4 were connected? Is 3V3_VCC still shorted to ground?

Yes, without U49 I have the two pins 2 and 4 towards GND.

[R_J]

Re: Telefunken TE32182B29C10

With U49 you no longer have a short on 5V_VCC, that is good.
Can you check the pins of U49 to se if the internal fets are shorted?
With U49 removed, Do you stll have a short on the board where pins 2 and 4 were connected? Is 3V3_VCC still shorted to ground?

[Bobo360]

Re: Telefunken TE32182B29C10

Thanks for your suggestions. I just removed U49 and the short circuit between 5vcc and gnd is gone. But the pins of U49, 2 and 4 are always in Gnd. What do I do? Ps: I hope to remember where the capacitors were placed. Ps2: so I found that U49 was broken since now 5vcc is not at Gnd?

[R_J]

Re: Telefunken TE32182B29C10

What you can do is put some alcohol on that area of the board, then apply 1 to 3 volts to the 5V_VCC point, momentarily. the part that is shorted will get hot very fast and the alcohol on the component will evaporate fast.
You could also just put your finger on U49 and use a 1.5 volt battery to apply 1.5 volts to +5V_VCC, if it gets hot you found the shorted part.

[arizanotlari]

Re: Telefunken TE32182B29C10

U49 convert 5V to 3V3. remove u49 and check SC again.

[Bobo360]

Re: Telefunken TE32182B29C10

Then,

I told the diode D172, which was in short circuit (marked in yellow).
D172 removed from the PCB results in an open circuit.
I think something broke or happened in that area.
However here points are still in short circuit.

I took away all of them capacitors marked in red. But still in those garments there is a short circuit towards GND.

short circuits are also short circuits even the small capacitors marked a light blue dot. I would like to remove them, but I know that it is better to remove the U49. what do you suggest?

Pin 4 of Q225 (therefore 5Vdc) is also in short circuit with GND.
The two C342 capacitor pins are both shorted with ground.

I know U49 is very small,

what do you suggest?

Thank you

[Bobo360]

Re: Telefunken TE32182B29C10

excuse me, my connector is like the cn5 with 12 pins in total. And i have 3 pins at 12volt stby.

Pin10, 11,12.

pic

[Bobo360]

Re: Telefunken TE32182B29C10

Excuse me, my connector is Like the CN5 with 12 pins in total. And I have 3 pins at 12volt stby.

Pin10, 11,12.

[R_J]

Re: Telefunken TE32182B29C10

CN30 pin11 is 5V stby NOT 12 volts! CN30 pin12 is 12v stby. I see the test point on page 58
mosfet_control signal comes from stby_on/off and comes from OPWRSB (from microprosessor U14) If the main microprocessor is not working you will not have that signal. 3v3_stby supplies the microprocessor
TL431 reference ic is used on many power supplies, you can use to92 style for testing

[Bobo360]

Re: Telefunken TE32182B29C10

I fed the card into the CN5 / CN30 connector with only 12V
Pin11 and Pin2 (GND)

I performed the measurements in the go points:

TP1= 1,2V
TP2= 4.31V
TP3= 4.24V (5V_STBY)
TP4= 221mV (3V3_STBY) I think it's normal, U1 is missing
TP10= 0.690V (1V1_MT5135)
TP12= 5.84V (12V_VCC)
TP13= 3.48V (5V_VCC)
TP15= 2.59V (3V3_ACC)
TP18= 1.52V (1V5_VCC)
TP21= 1.19V (1V2_ACC)
TP25= 0V
TP29=3.45V
TPT222=3V

At first glance we see that 12vcc is not going.
Could it be Q61 / Q24?
or it is the Q61 taste or it doesn't get the right command from Q24. right?

But could the "MOSFET_CONTROL" signal affect it?


could a test be unplugging FS2?

Thank you

[R_J]

Re: Telefunken TE32182B29C10

You should be able to power the ic with 12 volts, but if there is a short on the output you will not get 5 volts out. I can not tell wher the [yellow] capacitor is connected, The 17mb82 schematic should be close for that circuit.

[Bobo360]

Re: Telefunken TE32182B29C10

Hello,

I did some tests.

The D5 marked me as a fault, because I had a continuity in it, you have your clothes.
On the other hand it was not like this.
I disconnected both the resistance marked in orange and the condenser marked in Yellow. I have removed U1, but I have broken it off. (TL431SAMF2).

Returning to the D5 because it seemed to be short-circuited.
I noticed that you have leaders of the yellow capacitor, the tester shows me about 1.5 ohms, that is a very low resistance. it sounded to me believing in a short circuit.
it's normal? Both with the condenser attached and detached.
comuqnue this part of the circuit should give the 3.3Volt starting from 5 volts.

I know that I must, in addition to replacing the U1, look for another part of curcuit.

In your opinion, can I power the U46 with DC 12V and see if I have 5 volts at the output?

what do you say?

I enclose two photos.

Thank you

[R_J]

Re: Telefunken TE32182B29C10

Find the correct schematic and upload it here

[Bobo360]

Re: Telefunken TE32182B29C10

There is a 5.6volt zener diode (D2) close to L27, If you are lucky the zener diode is shorted to ground and protected the 5 volt standby line
See if this schematic is close, (page58)

in the diagram I read "17mb82-1a"

I have 17MB82-2