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Sony KDL 40BX425 does not turn on I request main diagram

j_gramont

hace 5 años

Hello colleagues: I received this TV completely dead does not turn on the LED. Detect that the 5 volts fall on the main board. For a short is that line, which accuses the regulator U702 at its output of 3.3 volts, remove it and everything remains the same. Remove the 80-pin U501 as I estimate that the HDMI input was damaged with a negative result. Also remove U502 and follow something with mace. in that line. I will appreciate if any colleague has the schematic diagram of the main board, sony KDL40BX425 to verify if there is anything else on the road, or it is already a problem of the micro. July gramont Best regards.

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TobíasTv

13.721

hace 5 años

my like goes

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TobíasTv

13.721

hace 5 años

Hi J, here you can download the diagram you requested https://www.electronica-pt.com/esquema/tv/sony-esquemas-tv/sony-kdl-22bx325-chassisaz2-tk-lcd-21627/ If you answer, I give you my Like of Luck for solutions but I hope for yours;) If you ask a question in the forum, always answer it, the colleagues who answer you spend your time and knowledge with the will to help you, if you are grateful, choose the best answer and give a Like to those who participated. Thank you for collaborating in the forum and Success with your repair

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j_gramont

hace 5 años

Hi. Thank you colleague, I am consulting diagrams that I have and the one you sent me to try to establish where the short is coming from since I have removed the 80-pin U702 U501 that switches HDMI that was cracked and U502 and the short continues in the 3.3 vol line which is mace. Thanks and regards

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TobíasTv

13.721

hace 5 años

I am going to give you an idea, circulate current through the line that is short, the component that is bad will heat;)
I used my regulated workshop supply, cut to 2.5 amps, the component that is bad is fried, hehe
but watch this video, they do it with a common source and a resistance
https://www.youtube.com/watch?v=v4bGO92sNaQ
They use a laser zone, I finger them, lucky

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DJ G

1.026

hace 5 años



hace 5 años

9619_Sony_KDL-22-32BX325_22-32BX326_32-40BX425_Chassis_AZ2-TK_Level_III_Televisor_LCD_Manual_de_servicio.pdf [6.52MB] Hi mate, I just repaired one with the same problem, the solution was to change the U702 = 1117-33.

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j_gramont

hace 5 años

Hello:
Buddy thanks for your reply. I thought I was going to have better luck. My problem sounds like micro. Already as I said in the question remove the reg. 3.3 U702 80-pin HDMI switch and U502. and the whole line of 3.3. volts follow mace ..
I am trying to establish if there is anything else before the micro.

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DJ G

1.026

hace 5 años

companion excuse me to insist but you have already read this topic https://yoreparo.com/tv/televisores/lcd/preguntas/1516456/sony-kdl-32bx425-totalmente-apagado?p=5673139#5673139 in the describes the problem, also you I comment that there is a part of the circuit that marks short with mass but it is so, that is for the ic U703 between pins 3 and 4

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TobíasTv

13.721

hace 5 años

if it is the theme board that GJ uploaded to me, it happened that the ic that connects the hdmi ports was shortened, do not change it, just take it out and the TV will start, obviously without hdmi

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