Re: Samsung LN32C450 - Audio but no video
I'll be around today to diagnose anything that you see fit.
The behavior with the E-PWN and BLU_ON wires d/c is an operational TV = GOOD.
The 24V is still reading 26.6-26.7V.
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Re: Samsung LN32C450 - Audio but no video
Something else strange has happened. I bought a new main board and installed it. It still would not work. I then disconnected the BLU_ON wire, still nothing. Then I pulled wires one by one til I got to E-PWN. I MUST d/c both the BLU_ON and E-PWN to then get the picture, but i do! Backlight and stream from my PC come through. That's a first.
Why did this happen and is it OK to D/C E-PWN?
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Re: Samsung LN32C450 - Audio but no video
Any last thoughts on this?
Also, if I were to buy a main board must it be the same part # or can I substitute others that say they are compatible for this tv?
Thanks!Last edited by Aulus; 12-15-2013, 05:14 PM.
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Re: Samsung LN32C450 - Audio but no video
Also, retested the 24V wires with the backlight ON. I did notice a difference: 27.1V instead of 28.4V with the backlight OFF.
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Re: Samsung LN32C450 - Audio but no video
I found it on the under side, but cannot find it on the top side. Here's where the chip is at: Top left part of the board and just 1/8" up-left of the plastic support post. Should I be able to trace it or what do I do?
This can be seen on the psu board picture in the original post. Also notice that the camera flash shows the board as shiny. Not sure what caused this, but the top left portion of the psu board has this shiny look to it, with the edge of the board actually showing mold spots....
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Re: Samsung LN32C450 - Audio but no video
The 13V is reading 14.2V.
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Re: Samsung LN32C450 - Audio but no video
On 200VDC it read spot on for the AA Battery.. 1.5V
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Re: Samsung LN32C450 - Audio but no video
Keep getting 28.5V. Done this on three separate days both on the inverter and PSU boards.
Is there a way to test if my multimeter is calibrated correctly?
It's new, on the 200VDC setting, so maybe it's not as accurate for 24V? Can't use 20VDC.....
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Re: Samsung LN32C450 - Audio but no video
Thoughts on the next step?
Also, thanks for your help thus far. It's been a learning experience and quite entertaining
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Re: Samsung LN32C450 - Audio but no video
I'll list the pins and their corresponding voltages:
1 - E-PIN: 1.0
2 - NC: 0
3 - BLU_ON: 5.1
4 - INV_ERROR: 1.6
5-9 GND
10-14 - B24V: 28.5V
Probably means nothing, but just something I experienced: When I unplug the AC plug from the back of the TV the blacklight flickers on/off but when I power down the TV through the front panel it does not.
Anyway, do you see anything peculiar in these voltages?...
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Re: Samsung LN32C450 - Audio but no video
Any thoughts on what I can try next?
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Re: Samsung LN32C450 - Audio but no video
TV plugged in: 160V
TV plugged in and powered on: 384V
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Re: Samsung LN32C450 - Audio but no video
Any more thoughts on where to go from here?
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Re: Samsung LN32C450 - Audio but no video
Ran the both the backlight and the brightness from 0 -> full. No change. Tried this with BUL_ON (Wire #4) connected and disconnected. No change....
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Re: Samsung LN32C450 - Audio but no video
Yes. With the PSU-MAIN connected and wire #4 D/C, the flicker occurs on powering down....
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Re: Samsung LN32C450 - Audio but no video
Well that was correct, but now all of a sudden after unplugging the AC for a while it went back to turning on the backlight when the PSU-Main cable is D/C.
The symptom that I've seen change is that upon turning off the TV it now flickers the backlight once, then stays dark.
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Re: Samsung LN32C450 - Audio but no video
Something odd happened and it wasn't that it works, hah.
So now when I turn off the TV the backlight flickers once. This does not happen when powering on the TV. Also, when I plug/unplug the main board cable it flickers once. I am no longer getting the constant backlight upon main board cable D/C.
Let me know where to go from here ...
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Re: Samsung LN32C450 - Audio but no video
Ok here are the pictures, this is fun. Let me know what's next.
Can you help me with an amateur question? Does the pin diagram correspond to how the wires go into the circuit on the board? If this is the case wouldn't the power board side picture with the D/C cable mean that as I look at the connector that the 2nd pin down from the top right would be the BLU_ON pin #4? I'm having a hard time trying to describe from the picture where it's at....
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Re: Samsung LN32C450 - Audio but no video
That's right tom66.
I don't mind a flicker. How would I go about jumpering the BL ON/OFF?...
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Re: Samsung LN32C450 - Audio but no video
If it's not too intense I would like to diagnose this with my DMM, not because I don't believe you, but more as a hobbyist looking to learn more about these TVs. Let me know what I need to probe. ...
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