Need to know IC name

[Brave]

Hello all
I am new in this forum and this is my first topic.
-I have damaged IC in the screen board of ete video intercom system type T-708c.

please, I want know its name.

See attached image.

[Brave]

please help me

[Simon]

The number is rubbed out, so what do you want us to do? bumping your thread hours later won't help.

[EEEnthusiast]

can you read any digits from the IC?

[Brave]

can you read any digits from the IC?

the short circuit caused the damage of writing of the IC

[Brave]

can you read any digits from the IC?

the short circuit caused the damage of writing of the IC

the IC is like this

[Brave]

The number is rubbed out, so what do you want us to do? bumping your thread hours later won't help.

the short circuit caused the damage of writing of the IC

[james_s]

It looks like a buck regulator, a good starting point would be buck regulators in an 8 pin SOIC package, it shouldn't be too hard to identify the pinout, the inductor and freewheel diode are easily identified.

[Brave]

It looks like a buck regulator, a good starting point would be buck regulators in an 8 pin SOIC package, it shouldn't be too hard to identify the pinout, the inductor and freewheel diode are easily identified.

thank you sir
can you give an example of this regulators.

[fzabkar]

The "FSC" marking could point to Fairchild Semiconductor Corp, which is now a subsidiary of ON Semiconductor.

I would start by identifying the other ICs, in particular U9, U6, U1 and U8. This should hopefully tell us which supply voltages are generated onboard.

Can you identify the markings on the two resistors above D1? I believe these would be the feedback resistors for the buck regulator. We could then estimate the likely voltage at the feedback pin of the regulator, which would help to narrow down the candidates.

Also determine which pin connects to L3 and the cathode of D1. That will be the Lx output of the regulator.

The regulator's Vcc and Ground pins should be easy to determine.

[james_s]

I would start with the parametric search on Digikey and look for buck regulators in a SOIC-8 package, then start comparing pinouts. It's possible that it's something like the NCP3170ADR2G, it's also possible that there are multiple parts that will work.

Another thing you could do is post the exact make and model of the device and maybe someone else with the same unit can look at theirs.

[Brave]

The "FSC" marking could point to Fairchild Semiconductor Corp, which is now a subsidiary of ON Semiconductor.

I would start by identifying the other ICs, in particular U9, U6, U1 and U8. This should hopefully tell us which supply voltages are generated onboard.

Can you identify the markings on the two resistors above D1? I believe these would be the feedback resistors for the buck regulator. We could then estimate the likely voltage at the feedback pin of the regulator, which would help to narrow down the candidates.

Also determine which pin connects to L3 and the cathode of D1. That will be the Lx output of the regulator.

The regulator's Vcc and Ground pins should be easy to determine.

[Brave]

The "FSC" marking could point to Fairchild Semiconductor Corp, which is now a subsidiary of ON Semiconductor.

I would start by identifying the other ICs, in particular U9, U6, U1 and U8. This should hopefully tell us which supply voltages are generated onboard.

Can you identify the markings on the two resistors above D1? I believe these would be the feedback resistors for the buck regulator. We could then estimate the likely voltage at the feedback pin of the regulator, which would help to narrow down the candidates.

Also determine which pin connects to L3 and the cathode of D1. That will be the Lx output of the regulator.

The regulator's Vcc and Ground pins should be easy to determine.

[EEEnthusiast]

My best guess is the NCP3170. You can try that and see if it works.

[fzabkar]

The pinout of the NCP3170 does not match the circuit:

https://www.onsemi.com/pub/Collateral/NCP3170-D.PDF

The Eon EN25F10-100GIP chip is a 3.3V serial flash memory:

file1.dzsc.com/product/14/07/23/128551_013504113.pdf

The BM1117-1.8 is a 1.8V LDO regulator:

http://www.bookly.com/images/BM1117.pdf

The MST712CX-LF is made by Morningstar Semiconductor (Mstar). I haven't been able to find much about it, but these SoCs usually require a Vcore and a Vio voltage. I suspect these are 1.8V and 3.3V, respectively, but I haven't been able to identify the "246" regulator IC.

Edit:

Where does the Vcc pin of the flash IC go? Does it connect to L1 or L19? That will be the +3.3V regulator.

The Vcore supply is more likely to be around 1V or so. If the two feedback resistors are 103 (10K) and 242 (2.4K), then …

Vfb = (10 / (10 + 2.4)) * 1 volts = 0.806 volts

0.8V is a typical feedback voltage for these buck regulators, so Vcore = 1V might be in the ballpark.

Edit #2:

I'm wondering if I'm wrong about the "FSC" marking. It seems that the designer of the PCB has chosen "off-brand" ICs, so ON Semiconductor would seem to be an unlikely fit.

[Brave]

The pinout of the NCP3170 does not match the circuit:

https://www.onsemi.com/pub/Collateral/NCP3170-D.PDF

The Eon EN25F10-100GIP chip is a 3.3V serial flash memory:

file1.dzsc.com/product/14/07/23/128551_013504113.pdf

The BM1117-1.8 is a 1.8V LDO regulator:

http://www.bookly.com/images/BM1117.pdf

The MST712CX-LF is made by Morningstar Semiconductor (Mstar). I haven't been able to find much about it, but these SoCs usually require a Vcore and a Vio voltage. I suspect these are 1.8V and 3.3V, respectively, but I haven't been able to identify the "246" regulator IC.

Edit:

Where does the Vcc pin of the flash IC go? Does it connect to L1 or L19? That will be the +3.3V regulator.

The Vcore supply is more likely to be around 1V or so. If the two feedback resistors are 103 (10K) and 242 (2.4K), then …

Vfb = (10 / (10 + 2.4)) * 1 volts = 0.806 volts

0.8V is a typical feedback voltage for these buck regulators, so Vcore = 1V might be in the ballpark.

Edit #2:

I'm wondering if I'm wrong about the "FSC" marking. It seems that the designer of the PCB has chosen "off-brand" ICs, so ON Semiconductor would seem to be an unlikely fit.

thank you sir
can you put the modification in the picture?

[Brave]

Hello all
what about OB3370 ?

[Brave]

I found that :
+12 connected to pin 2.
GND connected to pin4.

[fzabkar]

Does pin #8 of the EN25F10 IC connect to L1 or L19?

The OB3370 is a completely different chip (LED backlight driver):

https://pl-1.org/getproductfile.axd?id=3583&filename=OB3370.pdf

[fzabkar]

I found a parts list for a SONY DA-792:

https://remont-aud.net/dump/lcd_dvd_tv/sony/sony_da_792/318-1-0-7022

The list includes MST712CX-LF and EN25F10.

The buck regulator is a TD1410.

TD1410, Techcode Semiconductor, PWM Buck DC/DC Converter, 2A, 380Khz, 20V, SOIC-8:
http://dalincom.ru/datasheet/TD1410.pdf
http://www.techcodesemi.com/datasheet/TD1410.pdf

The pinout is a match. However, the feedback voltage is 1.222V, which means that …

Vout = 1.222 x 1.24 = 1.52V

The TD1410 requires an external Schottky diode, as does the video intercom PCB. If we could confirm that the Vcore requirement for the MST712CX SoC is 1.5V, then I think the TD1410 would be a suitable replacement.

Edit:

This IC appears to be an equivalent.

BM1410A, Bookly, step-down DC-DC converter, 2.2A, 380kHz, 5V - 23Vin, SOP-8:
http://www.bookly.com/images/BM1410A.pdf

It is pin compatible with ACT4060/ TD1410 / MP1410.

So it would seem that there are at least 4 possible substitutes.

Edit #2:

MP1410, Monolithic Power, step down switch mode regulator, 2A, 4.75V - 15Vin, 380kHz, SOIC-8:
file.yizimg.com/332467/2009080605462983.pdf

The ACT4060 has a slightly higher FB voltage (1.293), so Vout = 1.293 x 1.24 = 1.60V

ACT4060, Active Semi,  step-down DC/DC converter, 2A, 420kHz, 4.5V - 20Vin, SOP-8:
file.yizimg.com/332467/2009072110594237.pdf

Yet another substitute (FB = 1.222V):

FP6182, Feeling Technology, 2A, 23V, 380KHz Step-Down Converter, SOP-8:
http://www.feeling-tech.com.tw/km-master/ezcatfiles/cust/img/img/24/fp6182v061-g1.pdf

[james_s]

Something that has been nagging me though, when a buck regulator fails it's common for the output voltage to go all the way up to the input voltage, so usually whatever it powers will be fried.

[fzabkar]

The OP should measure the resistance between the coil and ground. That should tell us whether the SoC is shorted.

FWIW, Sony's NS756 TV DVD player uses the same SoC. A service manual might be helpful, if someone could find it.

The MP1410ES is available from Mouser for AU$1.59:

https://au.mouser.com/ProductDetail/Monolithic-Power-Systems-MPS/MP1410ES-LF-Z?qs=sGAEpiMZZMv0keMCjoUGAeAtVwFI8TFb

[Brave]

I found a parts list for a SONY DA-792:

https://remont-aud.net/dump/lcd_dvd_tv/sony/sony_da_792/318-1-0-7022

The list includes MST712CX-LF and EN25F10.

The buck regulator is a TD1410.

TD1410, Techcode Semiconductor, PWM Buck DC/DC Converter, 2A, 380Khz, 20V, SOIC-8:
http://dalincom.ru/datasheet/TD1410.pdf
http://www.techcodesemi.com/datasheet/TD1410.pdf

The pinout is a match. However, the feedback voltage is 1.222V, which means that …

Vout = 1.222 x 1.24 = 1.52V

The TD1410 requires an external Schottky diode, as does the video intercom PCB. If we could confirm that the Vcore requirement for the MST712CX SoC is 1.5V, then I think the TD1410 would be a suitable replacement.

Edit:

This IC appears to be an equivalent.

BM1410A, Bookly, step-down DC-DC converter, 2.2A, 380kHz, 5V - 23Vin, SOP-8:
http://www.bookly.com/images/BM1410A.pdf

It is pin compatible with ACT4060/ TD1410 / MP1410.

So it would seem that there are at least 4 possible substitutes.

Edit #2:

MP1410, Monolithic Power, step down switch mode regulator, 2A, 4.75V - 15Vin, 380kHz, SOIC-8:
file.yizimg.com/332467/2009080605462983.pdf

The ACT4060 has a slightly higher FB voltage (1.293), so Vout = 1.293 x 1.24 = 1.60V

ACT4060, Active Semi,  step-down DC/DC converter, 2A, 420kHz, 4.5V - 20Vin, SOP-8:
file.yizimg.com/332467/2009072110594237.pdf

Yet another substitute (FB = 1.222V):

FP6182, Feeling Technology, 2A, 23V, 380KHz Step-Down Converter, SOP-8:
http://www.feeling-tech.com.tw/km-master/ezcatfiles/cust/img/img/24/fp6182v061-g1.pdf

thank you very much sir
you gave me good informations.
so, the MP1410 is the best substitute.

[fzabkar]

Bingo!

FSC = Foslink Semiconductor.

FSP3170, Foslink Semiconductor, WIDE INPUT 2A STEP DOWN CONVERTER, 2A, 400kHz, 4.75V - 20Vin, SOP-8:
http://www.kexin.com.cn/pdf/FSP3170.pdf

The feedback voltage is 1.222V, so I think that the MP1410 should be an appropriate substitute.

[Brave]

thanks to all
I'll try suggestions of  fzabkar.
but where can I find this IC ? I mean the unused boards.