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Would not turn on.check pwr board does not give a consistent…

Customer Question
Would not turn on.check...

Would not turn on.check pwr board does not give a consistent 5dc volts

Technician's Assistant: What's the model number of your TV? How old is it?

UN40EH6030F/ABOUT 6YRS

Technician's Assistant: Does the TV menu work? Do you have the same problem on all sources/inputs?

NO/NO

Technician's Assistant: How long has this been an issue? What happened right before this popped up?

PICTURE TURN OFF/RED LIGHT BLINKS ON&OFF

Technician's Assistant: Anything else you want the Expert to know before I connect you?

I HAVE A LIMIT UNDERSTANDING OF ELECTRONICS

Submitted: 7 months ago.Category: TV
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Answered in 4 minutes by:
10/3/2017
TV Technician: Shahid, Technician replied 7 months ago
Shahid
Shahid, Technician
Category: TV
Satisfied Customers: 12,919
Experience: I have been repairing electronic gear since 1993 as a qualified Sony tech
Verified

Hi, my name is ***** ***** I will do my best to help you today. To make sure I don’t miss anything, please give me a minute to review your question.

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TV Technician: Shahid, Technician replied 7 months ago

- Where on power board you're checking 5V DC?

Pin and connector number please?

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Customer reply replied 7 months ago
Cnm803 on per board/I believe pin 20
Customer reply replied 7 months ago
No capacitors are bulging
TV Technician: Shahid, Technician replied 7 months ago

OK, please find A5V pin on CM803 and check 5V DC output while TV power cord is plugged in working outlet.

Also make sure meter is set on DC Volt range to get correct readings.

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Customer reply replied 7 months ago
I got OL on that pin
TV Technician: Shahid, Technician replied 7 months ago

OK, it would be pin-18 of CNM803 connector.

Are you sure voltmeter has set on DC Volt range and black lead is touching to metal frame of TV fro ground and use red lead to touch pin-18 to get 5V DC reading?

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Customer reply replied 7 months ago
Meter is at DC pin18reads 5.225
TV Technician: Shahid, Technician replied 7 months ago

OK, so you're getting 5V DC on power board.

Is the connector from main board plugged into CNM803 of power board and still get 5V DC reading?

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TV Technician: Shahid, Technician replied 7 months ago

OK, last question..

- Does power indicator light on TV turn On solid or blink when press power button?

- What reading appears on PS-ON/OFF pin of CNM803 when push power button on TV itself?

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Customer reply replied 7 months ago
Light is always blinking wether I push pwr bouton on or off.when meter is connected the reading goes from 5.22 to OL. This reading is the same with 2 different meters both on dc
TV Technician: Shahid, Technician replied 7 months ago

Please mention the pin number where the volts goes from 5.22 to OL

Also, what reading appears on PS-ON/OFF pin of CNM803 when push power button on TV itself?

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Customer reply replied 7 months ago
Pin 18.same read on both boards.pushing the button does not appear to make a difference
TV Technician: Shahid, Technician replied 7 months ago

PS-ON/OFF pin is pin-20 of CNM80

what reading appears on PS-ON/OFF pin of CNM803 when push power button on TV itself?

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Customer reply replied 7 months ago
5.22 on Terminal20
TV Technician: Shahid, Technician replied 7 months ago

OK, does that pin-20 volts change when push power button on TV?

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Customer reply replied 7 months ago
Pin 18&20 read the same and both go from 5.22toOL with the on button push or not
TV Technician: Shahid, Technician replied 7 months ago

OK, it seems the main board is also defective along with this power board so please replace both boards in TV, please get the part number off of label pasted on circuit boards that would be like BN94-05874S for main board and BN44-00552A for power board to search/ google it to get price info to order them if you have plan to do it yourself.

I hope these info will help. If you have any additional questions, feel free to ask. If you're satisfied, please rate me a 5-star at the top of your page so I can get credit of my work on website.
Thank you.

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TV Technician: Shahid, Technician replied 7 months ago

Do you need any further assistance with this question?

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Customer reply replied 7 months ago
diode DQ851 reads OLcould this be the problem
TV Technician: Shahid, Technician replied 7 months ago

I'm afraid this type of circuit bards are not suppose to be repaired on component level nor its detailed schematics are available to do so. Complete circuit board should be replaced for any trouble related to that board to ensure repair quality and product performance.

Thanks

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Shahid
Shahid, Technician
Category: TV
Satisfied Customers: 12,919
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Experience: I have been repairing electronic gear since 1993 as a qualified Sony tech

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