sammy LCD ln40b530p7f standby light on, but no power

[smai]

Hey I was given this TV and am trying to figure out which board is bad. It only has the standby light on and does not respond at all to any button. I do not have the remote for it. Any thoughts is much appreciated. Thanks

Edit: checked voltage at pin 1 (on/off) on the PS. shows 3.28v and holds when i press the power button

[dick_barton]

Re: sammy LCD ln40b530p7f standby light on, but no power

What voltages do you have on all the other pins?

[budm]

Re: sammy LCD ln40b530p7f standby light on, but no power

What voltages do you have on all the other pins?

+10
We need all DC Voltage readings of all the pin to see if they are all OK or not.
We also need the pictures of all the boards and how they are connected together.

[smai]

Re: sammy LCD ln40b530p7f standby light on, but no power

1-3.28 on/off
2-.04
3-5.28 5.3vsb
4-0 gnd
5-0 gnd
6-0 gnd
7-.04 13v
8-.09 13v
9-0 gnd
10-0 gnd
11-0 gnd
12-0 gnd
13-0 5.3v
14-0 5.3v
15-0 5.3v
16-0 5.3v
17-0 gnd
18-0 gnd
19-.09 13v
20-0 gnd
21-.09 13v
22-.09 13v
23-0 inverter on/off
24-0 NC
25-0 E_PWN
26-0 gnd
27-.04 DET_5V
28 through 30 ground

[smai]

Re: sammy LCD ln40b530p7f standby light on, but no power

Yea I have been on here long enough to know that I should have these pics on the 1st post shame on me

[budm]

Re: sammy LCD ln40b530p7f standby light on, but no power

23-0 inverter on/off

25-0 E_PWN
So you also do not have Inverter on, no dimming control.

[dick_barton]

Re: sammy LCD ln40b530p7f standby light on, but no power

Disconnect mainboard and jump Pin 3 (Stby5.3V) to pin 1 (ON/OFF) using a 1K resistor and also Pin 3 (Stby5.3V) to Pin 23 (InverterON/OFF) using a second 1K resistor and check the backlights come on.