Samsung T23B350 dead?

[CapLeaker]

Re: Samsung T23B350 dead?

Sounds like a plan

[budm]

Re: Samsung T23B350 dead?

How can you not have standby 5V (A5V) for the main board to run and able to put out command signals to turn on the rest of the power supply?
Recheck your work.
Run the power supply board by itself to see if A5V is present and steady.

[masterbateson]

Re: Samsung T23B350 dead?

Errrrr,
I dunno?

I check again.

Back soon

sorry

[masterbateson]

Re: Samsung T23B350 dead?

Now Then whilst re testing (cough)

I have found something interesting out.
When I unplugged the main board from the PSU, I got a white Illuminated Screen? Now thats odd, you unplug the power and your screen lights up?
Am I seeing the Backlight when it does this, which presumably comes from the four pin plug at the bottom of the PSU, and if so am I getting no display as the screen is displaying a completely black screen (all pixels on?)
plug in ---------------------- unplugged

pin1=B13v=13v ---------------- 13v

2 =EPWM=81mv --------------- 3.3v

3=B13v=13v -------------------- 13v

4=N/C=115mv --------------- 100-200mv

5=Vamp=13v ------------------- 13v

6=B_on=100 ish mv------------- 4.6v

7=Vamp=13v ------------------- 0-50mv

8=GND=0v ---------------------- 0v

9=GND=0v ---------------------- 0v

10=GND=0v --------------------- 0v

11=B5v=5v ---------------------- 5.2

12=A5v=5.2v -------------------- 5.2

13=B5v=5.2 --------------------- 5.v

14=P_on=3.3v ------------------3.5v

[budm]

Re: Samsung T23B350 dead?

Now Then whilst re testing (cough)

I have found something interesting out.
When I unplugged the main board from the PSU, I got a white Illuminated Screen? Now thats odd, you unplug the power and your screen lights up?
Am I seeing the Backlight when it does this, which presumably comes from the four pin plug at the bottom of the PSU, and if so am I getting no display as the screen is displaying a completely black screen (all pixels on?)
plug in ---------------------- unplugged

pin1=B13v=13v ---------------- 13v

2 =EPWM=81mv --------------- 3.3v

3=B13v=13v -------------------- 13v

4=N/C=115mv --------------- 100-200mv

5=Vamp=13v ------------------- 13v

6=B_on=100 ish mv------------- 4.6v

7=Vamp=13v ------------------- 0-50mv

8=GND=0v ---------------------- 0v

9=GND=0v ---------------------- 0v

10=GND=0v --------------------- 0v

11=B5v=5v ---------------------- 5.2

12=A5v=5.2v -------------------- 5.2

13=B5v=5.2 --------------------- 5.v

14=P_on=3.3v ------------------3.5v

When the power supply board is not connected to the main board, since there are pull up resistors to simulate HIGH control signals for self testing of the power supply board so if the power supply and the backlights circuits are OK, the backlights should come on and stay on as long as the unit is plugged into the AC outlet, and power switch is not needed to be activated.
BTW, you still have measurement error on the Vamp, one has 13V, another one has 50mV, those two pins are electrically connected together so they show the same reading.
And now you A5V is always there now? You were getting mV before.
Right now you have BL-ON command signal, the main board is keeping that control line LOW that is why you are not getting the Backlights, so you have problem on the main board.
Good DATA saves time troubleshooting.

[masterbateson]

Re: Samsung T23B350 dead?

You are of course quite right Bud, Vamp on pin 7 is 13v plugged in or out same as pin 5.

Pin 6 is def 4.6v unplugged and 50mvs plugged in.

So I am guessing its looking a bit like my main board is toast.

[budm]

Re: Samsung T23B350 dead?

You can have the connector back in place but disconnect just the BL-ON wire going back to the main board so the backlights will stay on, so if the only problem you have is the BL-ON signal then you should have all other function working and see images on the screen.

[CapLeaker]

Re: Samsung T23B350 dead?

can you upload a picture of the main board?

[masterbateson]

Re: Samsung T23B350 dead?

I can Pal! Will dig my camera out, I'll post the board details on too.

I am getting the feeling this Patient may not be salvagable at a reasonable cost.
Just noticed the Connector for the IR board is also Knackered, I wonder if display would come up and display via its VGA input and could be used as a monitor that way, but just without the IR/ touch panel functionality.

Maybe Its going to end up as sold for bits on ebay, (PSU,Remote and screen) I really would Like to be able to use this monitor for myself though rather than canabalizing the poor thing.


Im hoping if Im lucky I can cut the connector plug off and maybe hard wire to the IR board.

[budm]

Re: Samsung T23B350 dead?

You can have the connector back in place but disconnect just the BL-ON wire going back to the main board so the backlights will stay on, so if the only problem you have is the BL-ON signal then you should have all other function working and see images on the screen.

Did you try this yet before wasting time to find out if the main board has more than just the BL-ON problem, or may also have panel problem beside the IR board problem. Right now you have all the correct Voltages and signals except the BL-ON signal. Why wasting time trying to fix the IR board now?

[Davi.p]

Re: Samsung T23B350 dead?

IR?? It's a TV! You're on the wrong section...!

[budm]

Re: Samsung T23B350 dead?

IR?? It's a TV! You're on the wrong section...!

http://tech.firstpost.com/reviews/sa...iew-28053.html

[masterbateson]

Re: Samsung T23B350 dead?

I disconected pin 6 BL on and no change still no display.

Not bothered about the IR board as such Bud, but was worried that if it was disconected/broken whether that would stop the monitor firing up.

As far as i was aware this samsung is marketed as a tv/monitor or monitor/tv.
Yes it has a tuner but guy I bought it from was using it as a monitor and that is all i want to use it for.

Just tried your link Bud! I see what you did there, full marks and a shiny apple for you.

[budm]

Re: Samsung T23B350 dead?

So everything hooked back up except the BL-ON wire, you plug the TV into the outlet and you see the backlights but still no images on the screen, that means you have more than just the BL-ON command signal problem.

[masterbateson]

Re: Samsung T23B350 dead?

pics and board info for main board.


think its a Bn41-01798 main board.

[Davi.p]

Re: Samsung T23B350 dead?

You can try to insulate the keys lines on the ir/keys board, maybe there's the common key1 ley2 lines you have to insulate, then try the remote to switchon the tv. One clean method to insulate is to slide out the contacts on the cable conn. using a tiny screwdriver or a sharp tip on the blocks..

[masterbateson]

Re: Samsung T23B350 dead?

I think your talking more or less about what I had in mind Davi.
Many moons ago in one of my other lives, we used to repair print on circuit boards of Tellys.

We used to scratch of the Laquer/coating of the print run solder onto the exposed print,then solder a tinned wire to the track and finally we re coated the bridge with nail varnish to insulate (your choice of colour)

Hoping I can find a circuit diagram, strip off the wires of the connecting cables plug and solder directly to the track.
But as I've said, long as the set will come on without the use of that board, that will be fine as only want to use it as a monitor for my comp.
If it will run without this board, then I can save myself the hassle.

[Davi.p]

Re: Samsung T23B350 dead?

"Hoping I can find a circuit diagram, strip off the wires of the connecting cables plug and solder directly to the track."

Solder?? I haven't talked about to solder..

[masterbateson]

Re: Samsung T23B350 dead?

I know you havent but i have.
Not going to try and solder direct to print unless i have to.
As Ive said, If monitor will come on and auto detect my PC's input, then I dont mind if the IR panel is non functioning or disconected.

[CapLeaker]

Re: Samsung T23B350 dead?

I think you need a new main board. Probably there was something hooked up to the HDMI port and the main IC got a little tickle.