backlight issue Samsung UE32EH5000

[Rashid36]

Re: backlight issue Samsung UE32EH5000

Dear All member i need help about this chip with number "2n=2m" or any website where i can find this code

[Mikeyboy2007]

Re: backlight issue Samsung UE32EH5000

Pin 1 - B13V - 13.10v
Pin 2 - P_Dim - 0.90v
Pin 3 - B13V - 13.10v
Pin 4 - B13V - 13.10v
Pin 5 - VAMP - 13.10v
Pin 6 - BLU_ON - 4.88v
Pin 7 - VAMP - 13.10v
Pin 8 - GND - 0v
Pin 9 - GND - 0v
Pin 10 - GND - 0v
Pin 11 - B5V - 5.27v
Pin 12 - A5V - 5.29v
Pin 13 - B5V - 5.27v
Pin 14 - PS_ON - 3.5v

[dick_barton]

Re: backlight issue Samsung UE32EH5000

So BLU-On and PS_ON look fine. It does look as though you may well have a fault around the led driver IC or associated circuitry.
What is the part number of IC9101S?

[Mikeyboy2007]

Re: backlight issue Samsung UE32EH5000

will report back with that part number tomorrow dick_barton. so its the PSU at fault ? i have put screen back together so hopi g its nkt LEDs.

[budm]

Re: backlight issue Samsung UE32EH5000

So BLU-On and PS_ON look fine. It does look as though you may well have a fault around the led driver IC or associated circuitry.
What is the part number of IC9101S?

Post #13: "IC P/N is PC1AC SLC101 0
"
I did not have the time to look up that P/N yet.
Also need to verify if it is SLC1010 or not, some other SAMSUNG's use MagnaChip SLC2012, SLC5012.

[Dannyx]

Re: backlight issue Samsung UE32EH5000

Sorry for hijacking, but I'm having the exact same issue so I want to keep up with this thread also The only difference is that I might've made a boo-boo: not getting any voltage on the BLU_ON pin, I decided to force it on by putting 5v on it...the backlight DID come on when I did so, but then I saw some smoke coming out of the PSU :| I quickly unplugged it and as it was discharging, the backlight flashed like every 1-2 seconds. I'll be honest, I cannot see what smoked there...there's no visible damage, but now I somehow DO get 3v on the BLU_ON pin....not sure whether that should be happening or something indeed shorted and let out the smoke...sucks there's no schematic for this...

[Dannyx]

Re: backlight issue Samsung UE32EH5000

Ok I believe I found out what blew: it's a small SOT-23 transistor on the back. It's located just about the FET driving the coil for the LEDs. It's labeled as Q9005 and under extreme magnification it seems to have a slight bulge and a burn mark on it. It's also not giving any reading on my meter in diode mode, in any direction so it could be that was causing the issue all along. Now I'll have to kindly ask you to look on your board and tell me what's written on it, since it's extremely small to begin with and mine's also slightly charred so I can't possibly see what's on it. Cheers.

[Mikeyboy2007]

Re: backlight issue Samsung UE32EH5000

Post #13: "IC P/N is PC1AC SLC101 0
"
I did not have the time to look up that P/N yet.
Also need to verify if it is SLC1010 or not, some other SAMSUNG's use MagnaChip SLC2012, SLC5012.

its deffo the SLC 1010 Budm

[Mikeyboy2007]

Re: backlight issue Samsung UE32EH5000

So BLU-On and PS_ON look fine. It does look as though you may well have a fault around the led driver IC or associated circuitry.
What is the part number of IC9101S?

part number is in Post 13 dick_barton

[Mikeyboy2007]

Re: backlight issue Samsung UE32EH5000

Ok I believe I found out what blew: it's a small SOT-23 transistor on the back. It's located just about the FET driving the coil for the LEDs. It's labeled as Q9005 and under extreme magnification it seems to have a slight bulge and a burn mark on it. It's also not giving any reading on my meter in diode mode, in any direction so it could be that was causing the issue all along. Now I'll have to kindly ask you to look on your board and tell me what's written on it, since it's extremely small to begin with and mine's also slightly charred so I can't possibly see what's on it. Cheers.

i cant seem to find Q9005 but if you send me a picture of your board and to where i look i can certainly get P/N for you

[Mikeyboy2007]

Re: backlight issue Samsung UE32EH5000

sorry. found Q9005. will get it under magnifier and report back

[Dannyx]

Re: backlight issue Samsung UE32EH5000

sorry. found Q9005. will get it under magnifier and report back

Thanks. Please do that ASAP, would really appreciate it - it's for a client :| If I get that replaced, perhaps I can get back to working out why it's not working.

[Dannyx]

Re: backlight issue Samsung UE32EH5000

Is it by any chance 704 ? Would that make it this ?

[dick_barton]

Re: backlight issue Samsung UE32EH5000

its deffo the SLC 1010 Budm

DannyX has the same power supply as you and he says that the IC is an SLC1012C equivalent to FAN7340.
Can you measure the voltages on Pins 1 to 16 of the IC with leds connected.

https://www.badcaps.net/forum/showthread.php?t=63684

[budm]

Re: backlight issue Samsung UE32EH5000

Check the Voltage on the ADIM, BDIM, VCC, and ENA pins.

[Doc38343]

Re: backlight issue Samsung UE32EH5000

ok i flipped up PSU to read voltages on C9111. when i plugged in it went to 14, 17 then 19 then 1 displayed. i unplugged tv and voltage appeared 180 or so tjen gradually dropped. took 2 minutes for it to go back to 0v after switching off from plug.

Was reading thru and this helped me on one recently that was driving me crazy. those LED testers will fire up lights that could be failing normally.
I tested each little strip separately by disconnecting the connectors. on mine there were two strips per row and about 6 or 7 rows, the point is all of them had the same readings on my tester except one. the one that was low was my problem.

The IC CS is set to shut off if the current/voltage is not within a pre-set tolerance.

Just trying to help you may have already done this.

[dick_barton]

Re: backlight issue Samsung UE32EH5000

I have also used my multimeter set to amps in series with the output lead of the led tester so that it also shows the current being supplied to the stip.

[Dannyx]

Re: backlight issue Samsung UE32EH5000

DannyX has the same power supply as you and he says that the IC is an SLC1012C equivalent to FAN7340.
Can you measure the voltages on Pins 1 to 16 of the IC with leds connected.

https://www.badcaps.net/forum/showthread.php?t=63684

Yes, I confirm once again that's its the SLC chip Can't really test anything until I get that friggin' transistor replaced...I'm afraid something else might blow if I keep pushing it. The IC itself appears to be functioning correctly though, since the LEDs DO flash on and off, but they're very unstable since that control transistor is open-circuit and the enable pin is likely floating. I'm also not too sure what that array of 5 large resistors on the side of the board does....

[Mikeyboy2007]

Re: backlight issue Samsung UE32EH5000

Is it by any chance 704 ? Would that make it this ?

just looked there under magnifier. it looks like 704 however my 7 has the top piece not printed properly but for what i can make out its 704

[Mikeyboy2007]

Re: backlight issue Samsung UE32EH5000

Check the Voltage on the ADIM, BDIM, VCC, and ENA pins.

checked those voltages. im now suspecting failed IC ?

Pin 1 - VCC 13v
Pin 12 - ENA 0v
Pin 15 - ADIM 0.8v
Pin 16 - BDIM 0.8v