Telefunken TE32182B29C10

[Bobo360]

Hi everyone, I have this TV that turns off after a while that is on.

I changed the diode D107, and I was trying.

Unfortunately while I was measuring the voltages I jumpered + 5_Standby with 12Vcc (for distraction). and obviously everything went out.

Everything was mounted, power board 17IPS11-R4 and the 17MB82-2.

I tried the 17IPS11 power card alone, but there are no 5.2V stand-by voltages, the 2.4V ST_By.

The 12V and 24V are there.

In the card the following components are not mounted which should have given me 5.2V:

R103, R174, D113, Q104, C127 and C136.

Does this mean that the standby supplies me the motherboard?

Thank you

PS. do you have the main 17MB82-2 card?

[R_J]

Re: Telefunken TE32182B29C10

This power supply uses 12 volts for the standby, the lower voltages (+5v)are developed on the main board
24 volts is usually switched by q106 (if mounted) it is controlled by ST_BY from the main board.
Jumping +5V_STBY to +12VCC, likley did no harm to the power supply but may have damaged something on the main board, check where the +5V_STBY line connects on the main and check any components
Did the whole tv turn off or did you just loose the backlight and still have sound?
Your original problem is could becaused by a bad led in the panel.

[Bobo360]

Re: Telefunken TE32182B29C10

Thanks for the reply,

the Q106 is not mounted.

So I broke something in the main?

[R_J]

Re: Telefunken TE32182B29C10

There is nothing connected to +5v_stby, so shorting 12 volts to that pin will have no effect on the power supply.
Does the voltage on ST_BY change when you press the power button?
On the main board 12V_STBY gets regulated to +5V_STBY with U46, BUT it is very likely +5V_STBY is connected to CN30 pin11, so when you applied +12volts to the +5VSTBY anything on the main board connected to that line may be damaged, I would start by checking Q225, it switches 5V_STBY to 5V_VCC, so anything that uses 5v_vcc could have been damaged, also Q1,Q3 and U49 (3V3_VCC)

there is a schematic of the main available

[Bobo360]

Re: Telefunken TE32182B29C10

Unfortunately I can't verify this.

Why.

Since I found the short circuit between 12V and + 5_STBY, by mistake.

Now if with the two cards connected and food.
I smell stinks from the main. 17MB82-2.

What can I check here?

[R_J]

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)

[Bobo360]

Re: Telefunken TE32182B29C10

the zener diode D2 looks good. mounted measure 0.500 mV (multimeter)

What can I do?

[R_J]

Re: Telefunken TE32182B29C10

What do you mean it looks good? if you only have 0.500mv It could be shorted or the U46 regulator is bad You should have 5 volts on D2

[Bobo360]

Re: Telefunken TE32182B29C10

I don't want to feed, because it stinks from the motherboard.

[R_J]

Re: Telefunken TE32182B29C10

If it "stinks" when you apply power something is shorted and getting hot. I do not know how you can find it with only an ohm meter.

[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

[R_J]

Re: Telefunken TE32182B29C10

Find the correct schematic and upload it here

[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

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

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

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

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

Pin10, 11,12.

[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

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

[arizanotlari]

Re: Telefunken TE32182B29C10

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