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.

16 个问题查看全部

Raymond Pau @rpau

声誉积分: 48

3

2

发帖于: 2019年2月24日

更多选项

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

已回答！ 显示答案我也有这个问题

这是一个好问题吗？

是否

得分 1

2条评论

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

由 Minus 完成的 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.

由 Raymond Pau 完成的 2019年2月25日

添加一条评论

2个答案

已选择的解决方案

Minus @minus27444

声誉积分: 1.3千

4

1

发帖于: 2019年2月24日

更多选项

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.

这个答案有帮助吗？

是否

得分 1

3条评论:

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?

由 Raymond Pau 完成的 2019年2月25日

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

由 Raymond Pau 完成的 2019年3月17日

Glad you got it sorted :)

由 Minus 完成的 2019年6月3日

添加一条评论

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 声誉积分: 782千 1.1千 893 2.3千 · Answer 1 · 2019-02-24T08:13:08-07:00

最有帮助的答案

oldturkey03 @oldturkey03

声誉积分: 782千

1.1千

893

2.3千

发帖于: 2019年2月24日

更多选项

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

这个答案有帮助吗？

是否

得分 3

3条评论:

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.

由 Raymond Pau 完成的 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.

由 Raymond Pau 完成的 2019年2月25日

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

由 Peter 完成的 2023年6月3日

添加一条评论

Samsung UA40F5500AM 40" Smart LED TV

Cannot power on, standby light blinking twice for 5 times

Update (02/24/2019)

2个答案

Update (03/02/2019)

添加你的答案