Samsung UN60H7150 no audio/video standby light double blinks

[matchlessbloake]

I am trying to fix a Samsung UN60H7150 for a friend and need some help. The red standby led comes on as soon as the tv is pluggned in and it blinks after few seconds. TV does not seem to respond to power on either from remote or from the button on the unit. The red led double blinks 5 times and then stops blinking for few seconds and then double blinks again for 5 times and so on.

The DCV readings on the power board seem right. I was only able to take reading on the odd pin numbers and they all have 13V so I assuming PS_ON is working.


1 - NC - 0V
3 - PWM-DIM3 - 0V
5 - GND - 0V
7 - A13V - 12.8V
9 - A13V - 12.8V
11 - A13V - 12.8V
13 - A13V - 12.8V
15 - A13V - 12.8V
17 - GND - 0V
19 - Vamp - 12.8V
21 - Vamp - 12.8V


Removing cable between main and power board forces the back light to come on and stay on so it looks like the power board is fine (?).

I have tried disconnecting WiFi/BT modules and speakers to rule out short circuit in them but it did not help. Also tried disconnecting T-CON and LED back lights but that did not help either. I had a on/off button from another Samsung 60" TV that I tried using but still no luck. Since the blinking happens even when the T-CON is disconnected, is it safe to assume it is the main board? Main board for this TV are expensive so wanted to confirm before buying it.

Anyone has access to service manual? Thank you for your help.

[budm]

Re: Samsung UN60H7150 no audio/video standby light double blinks

"Removing cable between main and power board forces the back light to come on and stay on so it looks like the power board is fine" The power supply/LED driver and the LEDS backlghts are OK. Need to look at the main board as to why it is not sending the command signals to the power supply board.

[matchlessbloake]

Re: Samsung UN60H7150 no audio/video standby light double blinks

Thank you @budm for your reply.
Does the double blinks mean anything? The boot-up sequence for the most of the Samsung's I have seen has a slower single blink.

I am not able to get hold of SM so kind of stuck.

[jjanssen7]

Re: Samsung UN60H7150 no audio/video standby light double blinks

main board is pretty common on this model. A new one fixed mine.

[matchlessbloake]

Re: Samsung UN60H7150 no audio/video standby light double blinks

main board is pretty common on this model. A new one fixed mine.

Thank you @jjanssen. Have ordered new board, keeping fingers xed.

[matchlessbloake]

Re: Samsung UN60H7150 no audio/video standby light double blinks

Tried replacing new main board today. Now the TV power light flashes normally (slow single blinks) and I can hear audio but no picture
I see backlights. Not sure if I was unlucky and got the bad main board or it is the tcon that's bad. I took a chance and ordered a new tcon. Will update here once i get it.

[dskall]

Re: Samsung UN60H7150 no audio/video standby light double blinks

Did you check for blown fuse on t-con

[matchlessbloake]

Re: Samsung UN60H7150 no audio/video standby light double blinks

Sorry for the delay but I was out on vacation.
The fuse on t-con was fine. It turned out that I had received a defective main board the first time. A replacement main board fixed the issue.