Cannot power on, standby light blinking twice for 5 times

Question

Samsung UA40F5500AM 40" Smart LED TV

The model UA40F5500AM is a 40-inch smart television produced by Samsung.

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Raymond Pau @rpau

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投稿日: 2019年2月24日

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Cannot power on, standby light blinking twice for 5 times

Samsung 40” inch Smart LED TV. Suddenly stop working one night. Standby light on. Trying to put on by clicking the power button causes the standby light to blink twice for 5 sequence in between delay.

Reading from connector CNM803

Pin 1 B13: 12.76V

Pin 3 B13: 12.75V

Pin 5 Vamp: 12.75V

Pin 7 Vamp: 12.75V

Pin 9 Gnd: 0V

Pin 11 B5V: 5.24V

Pin 13 B5V: 5.24V

Pin 2 P_DIM: 2.90V

Pin 4 ECO: 0V

Pin 6 BLU: 2.91V

Pin 8 Gnd: 0V

Pin 10 Gnd: 0V

Pin 12 A5V: 5.24V

Pin 14 PS_ON: 3.11V

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This is the video controller & T-con. Any pictures of the psu?

Minus さんによる2019年2月24日

Picture of PSU is in the original Post. I added a comment to include the video controller and T-con board as a comment because it didn't allow me to add more than 1 picture in the original post.

Raymond Pau さんによる2019年2月25日

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Minus @minus27444

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投稿日: 2019年2月24日

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Thanks for the voltage readings however it is likely the psu, voltages will look normal when idle but drop when the psu is under load (power up). Have you checked visually the psu? Caps bulging etc.

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Yes. I had checked the capacitor. All of them looks good. Also test the diode (on-board). All these reading looks good too. How can I check if the voltages will drop under load? Any recommended test point to measure the voltage and when exactly to measure?

Raymond Pau さんによる2019年2月25日

Replaced with a brand new power supply board. That fix the problem.

Raymond Pau さんによる2019年3月17日

Glad you got it sorted :)

Minus さんによる2019年6月3日

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This is the video controller & T-con. Any pictures of the psu? — Minus
Picture of PSU is in the original Post. I added a comment to include the video controller and T-con board as a comment because it didn't allow me to add more than 1 picture in the original post. — Raymond Pau
Yes. I had checked the capacitor. All of them looks good. Also test the diode (on-board). All these reading looks good too. How can I check if the voltages will drop under load? Any recommended test point to measure the voltage and when exactly to measure? — Raymond Pau
Replaced with a brand new power supply board. That fix the problem. — Raymond Pau

oldturkey03 @oldturkey03 評価: 782.1千 1.1千 893 2.3千 · Answer 1 · 2019-02-24T08:13:08-07:00

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oldturkey03 @oldturkey03

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Samsung does not officially support any blink codes. Start with checking the power supply on all connectors. Use the legend (silk screened on the boards) to do your measurement. Also, check all the fuses on the power supply. Next check the main board connectors and measure the power on the T-con board. Next to the connector from the main board is a fuse and you should get ~12V on that. Let us know what number your board is so we can at least try to find you a schematic for the PSU

here is the fuse marked on your t-con board

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Yes. I read elsewhere that Samsung does not officially support blink codes. Fuse on the power supply looks good and voltage measure looks OK without load. I.e. Measured from cable end that connects to Logic board. Board Model Number is L42S1, Part Number BN44-00645A. Didn't tried to measure voltage across the main board; will try that next.

Raymond Pau さんによる2019年2月25日

Can't find the fuse on main board. Appreciate if you can post a photo to highlight location of that fuse. Thanks.

Raymond Pau さんによる2019年2月25日

Hello everyone. I had exactly the same problem - solved by replacing the main board

Peter さんによる2023年6月3日

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Samsung UA40F5500AM 40" Smart LED TV

Cannot power on, standby light blinking twice for 5 times

Update (02/24/2019)

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Update (03/02/2019)

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