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Yanleb · 04-21-2026, 10:19 PM

Thank you lotas. Your schematic of a BN96-03775A is close enough to my BN96-03057A. Both are for 32in TVs. But looking at a picture of the BN96-03775A I can see that QP801S is a TO-220FP and on my BN96-03057A it is a TO-247.

The funny part is that on the BN96-03057A schematic they made a second error. The pins of QP801S are wrongly numbered as 1-S, 2-G and 3-D, instead of 1-G, 2-D and 3-S. That explain why I had difficulties to find a substitute part. I was relying more on the schematic than on the actual PCB.

Anyway, you pointed me in a good direction. Thanks...

Yanleb · 02-23-2026, 10:51 PM

For records, I found my answer. MI801S and MI802S are STF5N52U on the BN44-00464A.

Yanleb · 02-23-2026, 11:43 AM

And BN44-00469A is very similar too....

Yanleb · 02-23-2026, 11:26 AM

After some research, the BN44-00489A is almost identical. MI801S and MI802S have the same designation, and both boards are for 40in TVs.

BN44-00464A fits in:
LN40D530M3FXZA
LN40D610M4FXZA
LN40D630M3FXZA

BN44-00489A fits in:
LN40A530P1FXZA...

Yanleb · 12-03-2025, 02:26 AM

I really doubt about an EMMC issue, as the TV was working just fine the last time it was used and put into a storage. I can understand it can happen anytime, but the exact day that I did put it in storage it is hard to believe.

The front LED was not set to off by user setting, I remember perfectly. The optic port is not lit. And there's no power to the USB ports either.

Like I said, the troubleshooting section for no power in the service manual talks about R9174. The PCB layout picture is so blurry in the service manual that it is hard to see exactly which resistor...

Yanleb · 12-25-2024, 10:29 PM

Ok, good solution to test the main board.

But how to test between the T-CON board and the panel, or between the main board and the panel when the T-CON board is integrated with the main board?

Yanleb · 11-20-2024, 11:21 AM

Thank you very much lotas. The TV is working perfectly now.

Yanleb · 11-19-2024, 12:21 AM

For writing back the IC, I use the MiniPro TL866CS. I see registers 0xFC and 0x42 instead of registers 0x88 and 0x42. Does it make a difference?

...

Yanleb · 11-19-2024, 12:19 AM

For writing back the IC, I use the MiniPro TL866CS. I see registers 0xFC and 0x42 instead of registers 0x88 and 0x42. Does it make a difference?

...

Yanleb · 11-19-2024, 12:07 AM

Thanks lotas, I have a programmer. Here is the dump file.

Where did you learn how to fix the dump files?...

Yanleb · 02-04-2024, 02:39 PM

Thank you for confirming the part number. But can you explain why it is shorting out immediately? I just don't understand why there's a transistor to pull the input to 16V_F while the input is only rated at 7 volts.

The schematic matches the board. And effectively I measure 5 volts at pin 5 VCC and 16 volts at pin 2 IN_A. Does it mean that this is a design flaw? Or that Q16702 is not supposed to be turned on?

Maybe I'm wrong to assume that 16V_F is 16 volts in reference to VAD. Can someone confirm?

Another question, can someone explain me why the base...

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