Toshiba 23l1350u standby voltage present, won't power up

[AcGeorgiegirl]

There's no standby led lighting up. Without the main board connected, I get 5.14 on the 3 pins labeled for 5v for what I assume is standby(con isn't labeled as such...see pics). With main board connected, I get the following pin voltages:

1 gnd
2 5vcc 5.21
3 5vcc 5.21
4 gnd
5 5vcc 5.21
6 13vcc 12.71
7 13vcc_AUD 12.71
8 gnd
9 PWON 3.03
10 ACD 3.46
11 gnd
12 BLON 0
13 DIM 0

I realize that pins 6 & 7 are supposed to be 13v. I don't know what pins 9 & 10 should be, nor 12 & 13. Also, when checking diodes and fuses, I found that D210A on the Secondary side has reading both ways (208 and 1342) I keep running into this, and am wondering if this is normal on the secondary side, or not? I usually don't take the diodes out of circuit when I test them...maybe this is why I get this?

[dick_barton]

Re: Toshiba 23l1350u standby voltage present, won't power up

I would say that the backlight on is missing (around 3V) and also Dim voltage

[budm]

Re: Toshiba 23l1350u standby voltage present, won't power up

i would say that the backlight on is missing (around 3v) and also dim voltage

+1

12 blon 0
13 dim 0

[CapLeaker]

Re: Toshiba 23l1350u standby voltage present, won't power up

BLon and the DIM signal are coming from the main board.

[koka0011]

Re: Toshiba 23l1350u standby voltage present, won't power up

try replacing the 1117-ADJ regulator.it is on the main board.located near lvds connector.

[koka0011]

Re: Toshiba 23l1350u standby voltage present, won't power up

i have highlighted the regulator

[AcGeorgiegirl]

Re: Toshiba 23l1350u standby voltage present, won't power up

Ok, I'll start with the regulator. Would it be smart to first test it, before ordering a replacement?

[dick_barton]

Re: Toshiba 23l1350u standby voltage present, won't power up

A check first would be useful.

[AcGeorgiegirl]

Re: Toshiba 23l1350u standby voltage present, won't power up

I get an input voltage of 5.21 and an output of 3.25.

[AcGeorgiegirl]

Re: Toshiba 23l1350u standby voltage present, won't power up

try replacing the 1117-ADJ regulator.it is on the main board.located near lvds connector.

I've looked for the label on this regulator, and it doesn't have what you've indicated...does this matter? The number code on the second line reads "17-33"...with possibly being "17-331". The top line isn't readable except the last bit of "3BC". I am wanting to make sure I have the correct specs for seeing if the output I get is good.

[vinceroger69]

Re: Toshiba 23l1350u standby voltage present, won't power up

I get an input voltage of 5.21 and an output of 3.25.

maybe a IRU1117-33 in a 5V to 3.3V regulator so if it is it working ok

[Agent24]

Re: Toshiba 23l1350u standby voltage present, won't power up

Are there any other regulators? I see some larger parts which could be higher current regulators. (From stock photos, seem to be U11, U13, U15)

There are also a few switching regulators, it seems.

Can we have a better photo of the mainboard?

[AcGeorgiegirl]

Re: Toshiba 23l1350u standby voltage present, won't power up

Are there any other regulators? I see some larger parts which could be higher current regulators. (From stock photos, seem to be U11, U13, U15)

There are also a few switching regulators, it seems.

Can we have a better photo of the mainboard?

I couldn't get in close enough for clarity, but here's some pics I hope will help.

[AcGeorgiegirl]

Re: Toshiba 23l1350u standby voltage present, won't power up

Are there any other regulators? I see some larger parts which could be higher current regulators. (From stock photos, seem to be U11, U13, U15)

There are also a few switching regulators, it seems.

Can we have a better photo of the mainboard?

The three regulators you've indicated are correct...they read:

U11 no input voltage
U13 no input voltage
U15 input 4 v
output 2 v
*this one, at first was reading 3v as input, but a couple of minutes later was 4

[AcGeorgiegirl]

Re: Toshiba 23l1350u standby voltage present, won't power up

I am understanding this looks like a main board issue, right? Any suggestions as to what I can test for failure, or do you guys suggest just replacing the board? I'd much prefer learning how to repair what's wrong, which is what you guys are so good at helping with!

[budm]

Re: Toshiba 23l1350u standby voltage present, won't power up

Yes, the main board problem, the key is to get the schematic diagram of the main board to do the component level troubleshooting of the complex main board.

[dick_barton]

Re: Toshiba 23l1350u standby voltage present, won't power up

What's the resistance between Pin 12 (BLON) and Pin 1 (GND) at the power supply connector and the equivalent positions from the main board?

[AcGeorgiegirl]

Re: Toshiba 23l1350u standby voltage present, won't power up

Yes, the main board problem, the key is to get the schematic diagram of the main board to do the component level troubleshooting of the complex main board.

Ok. Can you tell me, on the board, where the PN is, so I can start searching? I see two white labels that might be it, as well as what's written directly on the board at the far left top.

[AcGeorgiegirl]

Re: Toshiba 23l1350u standby voltage present, won't power up

What's the resistance between Pin 12 (BLON) and Pin 1 (GND) at the power supply connector and the equivalent positions from the main board?

I'm not sure what I would put my DMM on as far as mode...would I use Ohm's mode and then set it to range at 200(the lowest setting)?
...and should the power be plugged in and turned on, etc?

[vinceroger69]

Re: Toshiba 23l1350u standby voltage present, won't power up

no power on as testing resistance then test between pin 12 and pin 1 and yes ohms mode