Powersupply proble, SAMSUNG LA32R71B

[ewastecomputers]

Re: Powersupply proble, SAMSUNG LA32R71B

i received a samsung lcd with this problem but the previous own tried to fix it before i got it i would be in dept for the values of the caps on the secondary side of the board or all the electro's please.

[filjoa]

Re: Powersupply proble, SAMSUNG LA32R71B

Hi

I have the same problem... I change F9222L IC but problem continue...

when I put 230V IN LED start flash and I listen a noise like "iiiiiiiiiiiiiiiiiii", I think witch all capacitor stay ok...

- on KA431 I have 0V
- on sink of F9222L I have 150V
- on sink of primary MOSFET I have 150V

some one can help me find the problem?

best regards

[filjoa]

Re: Powersupply proble, SAMSUNG LA32R71B

Hi

any ideia?

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

Hi

I have the same problem... I change F9222L IC but problem continue...

when I put 230V IN LED start flash and I listen a noise like "iiiiiiiiiiiiiiiiiii", I think witch all capacitor stay ok...

- on KA431 I have 0V
- on sink of F9222L I have 150V
- on sink of primary MOSFET I have 150V

some one can help me find the problem?

best regards

Hi. Filjoa!

I'm from Spain, Now I have the same peoblem.
I changed the f9222l and problem persist.

Can you help me?
Capacitors I see good, I think

Best regards

Thanks

[budm]

Re: Powersupply proble, SAMSUNG LA32R71B

Pictures of the board?
Power supply board number? BNXX-XXXXXX?
One of these your board?
http://www.shopjimmy.com/catalogsear...?q=BN96-03775A

Are you getting low 12V, 24V?

If it is, then check the capacitance of CM802.

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

Pictures of the board?
Power supply board number? BNXX-XXXXXX?
One of these your board?
http://www.shopjimmy.com/catalogsear...?q=BN96-03775A

Are you getting low 12V, 24V?

If it is, then check the capacitance of CM802.

Thanks very much for your Reply Budm.

Yes, my board is a BN96-03775A.

I already changed the F9222L, and problem continuous.

I don't know where I test 12V or 24V.

CM802 is an electrolitic capacitor? Or a normal? How can I test? With an ohms tester?

Thanks very much for your help.

Sorry for my bad English.

Soon I go to bed

Best regards

[budm]

Re: Powersupply proble, SAMSUNG LA32R71B

The connectors have pin names next to them.
CM802 is special poly film, you need cap meter to verify the capacitance.
Pictures provided by Shopjimmy.
BTW, those yellow glues that turned dark brown MUST be removed, it is corrosive and conductive when they turn brown.

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

The connectors have pin names next to them.
CM802 is special poly film, you need cap meter to verify the capacitance.
Pictures provided by Shopjimmy.
BTW, those yellow glues that turned dark brown MUST be removed, it is corrosive and conductive when they turn brown.

Thanks Again budm!

Yes my board in the libk is rhe second $50,95

Yes my tester has got cap meter I think in faradios. But I have ro desolder

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

Pictures of the board?
Power supply board number? BNXX-XXXXXX?
One of these your board?
http://www.shopjimmy.com/catalogsear...?q=BN96-03775A

Are you getting low 12V, 24V?

If it is, then check the capacitance of CM802.

Thanks very much budm!

Now I'm at home, and the Tv is in my wife work.

Tomorrow I check and test it.

Then I tell you.

Thanks again.

You are very good man.

[budm]

Re: Powersupply proble, SAMSUNG LA32R71B

Check first if you do have 12V AND 24V on the connectors, black probe on the metal chassis and red probe on the 12V, 24v pins.
If the cap CM802 is bad you will get low Voltages on the 24V and the 12V pins.

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

Check first if you do have 12V AND 24V on the connectors, black probe on the metal chassis and red probe on the 12V, 24v pins.
If the cap CM802 is bad you will get low Voltages on the 24V and the 12V pins.

Hi again budm!

Now I´m testing the pins:

With tester in DC mode:
1.-Black wire on GND board and red wire on +12V pin = test= -0,17V NEGATIVES
2.-Black wire on GND board and red wire on +5,4V pin = test= -0,14V NEGATIVES
3.-Black wire on GND board and red wire on +24V pin = test= -0,14V NEGATIVES

4.-Black wire on GND board and red wire on one pin of CM802 = test= sometimes 12V or 17V or 4V......etc from 4V to 17V POSTIVES and sometimes only 2V or 4V

5.- Black wire on GND board and red wire on the other pin of CM802 = test= -4V and sometimes -2V and -0.2V.

6.- The same thing about CM 801 sometimes 3V or 4V in one pin and in the other -0,22V

I don´t understand nothing

I need help

Thanks again

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

Hi again budm!

Now I´m testing the pins:

With tester in DC mode:
1.-Black wire on GND board and red wire on +12V pin = test= -0,17V NEGATIVES
2.-Black wire on GND board and red wire on +5,4V pin = test= -0,14V NEGATIVES
3.-Black wire on GND board and red wire on +24V pin = test= -0,14V NEGATIVES

4.-Black wire on GND board and red wire on one pin of CM802 = test= sometimes 12V or 17V or 4V......etc from 4V to 17V POSTIVES and sometimes only 2V or 4V

5.- Black wire on GND board and red wire on the other pin of CM802 = test= -4V and sometimes -2V and -0.2V.

6.- The same thing about CM 801 sometimes 3V or 4V in one pin and in the other -0,22V

I don´t understand nothing

I need help

Thanks again

Hi Again!

Now I'm looking for any part of the board to see if I find somewhere 12 or 24V DC.

Testing always with black wire of the tester on GND on the board and the red wire on all the pins of the board, and never find more than 3 volts 4 volts or -3volts and -4 volts.

Now too this results on CM802 , CM801 , TM801S , LP801 ....

guess may be a serious problem in LP801 , OR/AND TM8015.....

but testing in AC from L or N ....always I find at the beginning of the board 220V and after always I find 110V AC in many pins or almost all pins.






I do not know what else to measure or where to go , but I would find the cause of this and then change the faulty component


Thanks for all

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

I wonder what the point where they should stay the 110V AC to continue with 24V or 12 V DC .

Because I can not find it

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

Now I have found the diode DM 804 testing ohms with 0 results .


This afternoon I continuosus

[vinceroger69]

Re: Powersupply proble, SAMSUNG LA32R71B

remove and retest the diode if you already havnt as sometimes they test ok out of circuit.

[budm]

Re: Powersupply proble, SAMSUNG LA32R71B

I wonder what the point where they should stay the 110V AC to continue with 24V or 12 V DC .

Because I can not find it

You are getting 110VAC because you are using the chassis as the GND ref. You need to measure between Line and Neutral. and the circuit after the bridge you will use the negative leg of the main filter cap as the GND ref for the primary side circuit. You use chassis as GND REF when making measurement in the secondary side.
So check the Diode off the board.
the 12V, 24V are tested with TV turned on? How about the capacitance of CM802?

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

You are getting 110VAC because you are using the chassis as the GND ref. You need to measure between Line and Neutral. and the circuit after the bridge you will use the negative leg of the main filter cap as the GND ref for the primary side circuit. You use chassis as GND REF when making measurement in the secondary side.
So check the Diode off the board.
the 12V, 24V are tested with TV turned on? How about the capacitance of CM802?

Hi, and thanks budm, and now too vinceroger69.

Now still I'm not working on tv.

Budm, This test I told I measuring with board out the tv. So only with board on the table and with 220V AC.
I mistake abour it? Sorry

About capacitance of CM802 this afternoon I desolder with the diode and test all.

Then I put here the results.

Thanks again budm!

[budm]

Re: Powersupply proble, SAMSUNG LA32R71B

"Budm, This test I told I measuring with board out the tv. So only with board on the table and with 220V AC.
I mistake abour it? Sorry"
You have to have the power supply board at least connected to the main board otherwise the the power supply board will not be getting the PS-ON signal from the main board to turn on the PFC Voltage booster circuit and the 12V/24V circuits in the power supply board.

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

"Budm, This test I told I measuring with board out the tv. So only with board on the table and with 220V AC.
I mistake abour it? Sorry"
You have to have the power supply board at least connected to the main board otherwise the the power supply board will not be getting the PS-ON signal from the main board to turn on the PFC Voltage booster circuit and the 12V/24V circuits in the power supply board.

Hi Budm,

Oh so sorry!

Now I tested the diode and it´s OK. So....jojojojojo

And I have the CM802 out desolder.

And my multitester with capacitor tester.....say 0...cero

[Jesusspain]

Re: Powersupply proble, SAMSUNG LA32R71B

Hi Budm,

Oh so sorry!

Now I tested the diode and it´s OK. So....jojojojojo

And I have the CM802 out desolder.

And my multitester with capacitor tester.....say 0...cero

Now, I´m going to desolder the CM801 and test it

And I tell you again