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
2019, May 21 - 12:14
#1
ANDRASONI LUCIAN
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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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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Hi,
I'll try this too,the best regards
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Hello!
I would blow your parts with KALTE-75 sray in your place!
Varga Jano
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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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Yes.Yes.
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OK, thanks!
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