Sony Bravia KDL-32BX300 No Standby Light

[1beertap]

I received this TV from a co-worker in order to fix. He claims that the TV got hit by lightning. The unit has no standby light turned on but the power supply does have standby voltage of 3.3v. I am thinking that the main board has a problem. Any ideas?

[capkid]

Re: Sony Bravia KDL-32BX300 No Standby Light

Do you have any other voltages? I'm trying to think through this: Is anything different if you disconnect the main board from the PSU?

[budm]

Re: Sony Bravia KDL-32BX300 No Standby Light

There are two yellow fuses on the power supply board by the white connector that goes to the main board, are they OK?
You should download the service manual:
http://elektrotanya.com/?q=showresul...oria=&kat2=all

[1beertap]

Re: Sony Bravia KDL-32BX300 No Standby Light

Do you have any other voltages? I'm trying to think through this: Is anything different if you disconnect the main board from the PSU?

main board plugged in
---------------------
STBY = 3.3v
ACOFFDET = 2.0V
POWERON = 3.28V

everything else = 0v

main board unplugged
---------------------
STBY = 3.3V
ACOFFDET = 3.29V
POWERON = 0V

everything else = 0v

[1beertap]

Re: Sony Bravia KDL-32BX300 No Standby Light

There are two yellow fuses on the power supply board by the white connector that goes to the main board, are they OK?
You should download the service manual:
http://elektrotanya.com/?q=showresul...oria=&kat2=all

Both fuses check good

[1beertap]

Re: Sony Bravia KDL-32BX300 No Standby Light

Hey guys, any other ideas?

[philliesfan30m]

Re: Sony Bravia KDL-32BX300 No Standby Light

do the wires that go to the standby light attach to the main board through the side power panel?

[philliesfan30m]

Re: Sony Bravia KDL-32BX300 No Standby Light




here is the schematic for this tv.

[philliesfan30m]

Re: Sony Bravia KDL-32BX300 No Standby Light

oops bud already posted 1 for your tv

[budm]

Re: Sony Bravia KDL-32BX300 No Standby Light

OK, on page 29 of the service manual, report the voltage reading of ALL the pins of CN6401/6402/6403 when TV is plugged in and not turn on ( in standby mode) and when TV is powered on by the power switch. Black probe on the chassis, all the boards are connected together.

[1beertap]

Re: Sony Bravia KDL-32BX300 No Standby Light

Okay, here's what I tested.

CN6401
-------
1 STBY3_3V = 3.3V
2 AC OFF DET = 2.0V
3 POWER ON = 3.28V
4 AUDIO_12V = 0V
5 AUDIO_12V_GND = 0V
6 REG12V_GND = 0V
7 REG12V_GND = 0V
8 REG12V = 0V
9 REG12V = 0V
10 BL_ERR = 0.05V
11 BL_ON = 0.04V
12 DIMMER = 0V
13 NC = 0V
14 T-CON_VCC_12V= 0V
15 T-CON_ON = 0V

CN6402
-------
1 UNREG24V = 0V
2 UNREG24V = 0V
3 UNREG24V = 0V
4 UNREG24V = 0V
5 UNREG24V = 0V
6 GND = 0V
7 GND = 0V
8 GND = 0V
9 GND = 0V
10 GND = 0V
11 BL_ERR = 0.05V
12 BL_ON = 0.04V
13 NC(ADIM) = 0V
14 DIMMER = 0V

CN6403
-------
CONNECTOR NOT USED

When I attempt to turn the unit on, the readings are still the same. Even though it does have a standby led and power led, both remain off at all times. The power button does work and is connected to the main board. The led indicators are connected to the main board via a separate connector from the buttons. Thanks guys and hope this helps.

[budm]

Re: Sony Bravia KDL-32BX300 No Standby Light

OK, you have power supply board problem, it is getting the PS_ON (Power ON) but the 12V, 24V are not coming on. BUT, one voltage should change state, POWER ON = 3.28V, it should be below 1V when TV is powered OFF and 3.28V when Power switch is activated, if it does not change state, that mean the main board is also stuck on, so you may also have main board problem.

[xredhawk]

Re: Sony Bravia KDL-32BX300 No Standby Light

i hear alot of problems with bad eeproms

[anmol]

Re: Sony Bravia KDL-32BX300 No Standby Light

disconnect socket from remot control board and check power on with keypad.

wbr

[chapulin]

Re: Sony Bravia KDL-32BX300 No Standby Light

since you do not have 12 volst you should check the circuit cxa

[dcapper]

Re: Sony Bravia KDL-32BX300 No Standby Light

I have the same tv and replaced the power supply. It was a no go. It's the mainboard. I'm almost sure of it. I think you have the same issue.

[anmol]

Re: Sony Bravia KDL-32BX300 No Standby Light

@ dcapper,

you have try as post #14 ?

disconnect socket from remot control board and check power on with keypad.

wbr

[dcapper]

Re: Sony Bravia KDL-32BX300 No Standby Light

@ dcapper,

you have try as post #14 ?

disconnect socket from remot control board and check power on with keypad.

wbr

I'll check mine tonight. I bought a new power supply and it didn't work, so I'm willing to go on a little faith.

[budm]

Re: Sony Bravia KDL-32BX300 No Standby Light

dcapper, are you getting the PS_ON signal to the power supply board?

[dcapper]

Re: Sony Bravia KDL-32BX300 No Standby Light

No. I ordered a new mainboard today for $50.00