Samsung "MU" series (UN, UA, UExxMUxxxx) fault dump IC1604 25Q40...

[Fabyj]

Hi, I have the board BN41-02568A on Samsung UE40MU6105KXXC.
Retro LED is working if power on Main Board is disconnected.
When Main Board si connected red power led is on, if I switch press power on remote control it's blinking then off (I think it's normal operating mode) but without any image on screen.
All voltages are present, 12V, 5V, 3.3V, 1.8V, 0.8V, ecc.
CPU is hot in power on and stand-by, so it's strange in stand-by.
I tried to program IC1604 with dump found here, red power led is always off, CPU is hot same but not wotking.
Please find attached my original dump.
Regards,
Fab

[SDNarcia]

Try it, don’t forget about status register (0x88, 0x42).

Hi Lotas, thank you so much for the help. I reprogrammed the TV and it worked for a few days, but it failed again. Any suggestions please?

I'll try reprogramming again to see the results once I get back to where I have the TV.

P.S. Sorry for the late response. I don't have the TV at home; it's out of town, and I only recently managed to go and test the file.

[Fabyj]

Hi dear SDNarcia and thanks for your replay!
I have RT809H and TL866 programmer, so how I can fix about status register (0x88, 0x42)?
Regards,
Fab

[dex1]

Hi dear SDNarcia and thanks for your replay!
I have RT809H and TL866 programmer, so how I can fix about status register (0x88, 0x42)?
Regards,
Fab

Read the first posts on this thread.

[lotas]

Hi dear SDNarcia and thanks for your replay!
I have RT809H and TL866 programmer, so how I can fix about status register (0x88, 0x42)?
Regards,
Fab

0x88, 0x42

[Fabyj]

Lotas thanks you so much for info!
Unfortunately without result
When power cord is connected power led is on but cpu is immediately hot with buzzing and it's strange in stand-by mode, when press back power button power led blink two times then go off and cpu continue to be hot.
I checked everything and no short present, only coil L406_UT get short, maybe it's normal GND connected and unfortunately i can't find schematic or datasheet about IC400_UT (VPM1R0A) to check it.
I tried to reflow cpu without result, I would like to reball it but i don't have stencil at moment.
I think there is some issue with cpu core and I don't know if reballing can help.

[lotas]

One choke in the T-CON area should be grounded at one end to generate a negative voltage relative to ground (VGL) to power the panel. If the LED blinks twice, this is usually a panel malfunction. Disconnect the LVDS cables from the motherboard and recheck the TV's behavior.
Check the HDMI, LAN and USB signal lines relative to ground; if at least one line is shorted or has low resistance, the processor is faulty.

[Fabyj]

Hi at all and thanks for suggest!
I checked every lines relative to LVDS, HDMI, LAN and USB signals and nothing is shorted.
I remember that CPU is hot in standby with power cord connected only.

[lotas]

Hi at all and thanks for suggest!
I checked every lines relative to LVDS, HDMI, LAN and USB signals and nothing is shorted.
I remember that CPU is hot in standby with power cord connected only.

Check the voltage and resistance map on the converters.