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lcd tv SAMSUNG LE40R71B relay clicking

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ANDRASONI LUCIAN

I have this TV equipped with the source BN44-00134A.Tv does not start, it is heard how the relay is continuously coupling and disconnecting. The stable voltage drop is STB = 6.5V, P-ON / OFF varies between 0.2-2.5V in normal operation = 2.6V) PFC between 360-385V (when going is 382V). All electrolytes, secondary-primary, have been changed, except the 220uF / 450V which is ok. In this state, if measure the voltage on the pins 1-2 to optocoupler PCS802, the relay stay connect and tv work normally . I have replaced the PCS802,801, the ICS 802 (KIA431), the QP803, the QS801, the QS802 checked. If I stop it(unplugged) and I restart the tv in a few minutes, it works normally, if I leave it a little longer, the defect returns. Any suggestion is welcome, I do not think it would be the problem with the mainboard. Thank you!
 I attach the power supply+ inverter schematic model BN44-00134A

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bluemoon

Hi,

this is common problem on this and similar. You need eeprom dump, it should solve this problem. The problem i caused by bad caps on power board.

best regards

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ANDRASONI LUCIAN

Thank you very much, you were right, alterated eeprom 24C32. Fixed the problem by replacing it with an empty memory (FF).The best regards”

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ANDRASONI LUCIAN

Hi,
I'll try this too,the best regards

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varga jano
varga jano's picture

Hello!
I would blow your parts with KALTE-75 sray in your place!
Varga Jano

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ANDRASONI LUCIAN

I'm sorry but I did not understand what you wanted to tell me ... did you refer to using the cooling spray to locate the fault? Thank you!

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varga jano
varga jano's picture

Yes.Yes.

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ANDRASONI LUCIAN

OK, thanks!

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