37bv700b flashing led

[budm]

Re: 37bv700b flashing led

Using a different meter volts are as follows
8.6v on 4
2.8 on 6
1.6v on 12
5v on 14
3.3 on 16

1.6 on 11
3.3 on 15
.5v on 17
.5 on 19
.5 on 21

No other voltagea

8.6V on pin 4 (SW-SWITCH)
2.8V on pin 6 (ST_BY) This signal should be <1VDC for the main power supplies to be turned on.
1.6V on pin 12 (+12V_1)
5v on pin 14 (+5VSTBY) OK
3.3V on pin 16 (+3.3VSTBY) OK

1.6V on pin 11 (+12V_1)
3.3V on pin 15 (+3.3VSTBY) OK
.5V on pin 17 (+5V)
.5V on pin 19 (+5V)
.5V on pin 21 (+5V)

See how much it is easier to see what you have and do not have?
So the ST_BY (PS-ON) from the main board is stuck HI when power switch is activated, it needs to go LO to turn on the rest of the power supply. When you disconnect the cable from the power supply to the main board that should force on the rest of the power supplies to come on.

[Rickig]

Re: 37bv700b flashing led

Nice on, do you know how to check for S/C ?

I know the basics but nothing advanced. Can check fuses, resistors and diodes. Not sure about caps and ic's etc

But I would like to get to the bottom of this, so if ps-on is stuck HI, what switches it to LO?

[budm]

Re: 37bv700b flashing led

I know the basics but nothing advanced. Can check fuses, resistors and diodes. Not sure about caps and ic's etc

But I would like to get to the bottom of this, so if ps-on is stuck HI, what switches it to LO?

The processor on main board command the PS-ON line to go LO.
But did you try having the main board disconnected from the power supply board as suggested to see if you do get the Voltages on those switched Voltages?

[Rickig]

Re: 37bv700b flashing led

No voltages when main disconnected. Fitted new psu that I had and to works so fault on psu. Need to find where.

[ReeceyBurger123]

Re: 37bv700b flashing led

On these units when you disconnect they will run the voltage rails, and before you say other wise I will upload a video to prove it. So your orginal Psu was at fault.

[Rickig]

Re: 37bv700b flashing led

I'm not arguing the facts with you and Whilst I appreciate what your saying reecy mine does not so let's assume that is a symptom of the fact Its faulty.... I have replaced the power supply and now the TVs on and working so it's clearly a faulty psu.
However I would like to try and find the cause of this failure. Now if you say it should run and mine isn't what could cause that and the fact as previously pointed out that the ps_on is stuck in high.

Regards

[ReeceyBurger123]

Re: 37bv700b flashing led

Ok do you know how to check diodes ?