Hi, I need help to identify an IC with marking code “V337”
Hello edcardona - welcome to the Forum Community. I’m sorry, I wasn’t able to identify your IC. Sorry I couldn’t help!
Hi @edcardona,
Wonder, could you provide another picture showing the components and tracks around the chip and information about the gadget this chip is a member of? Those are absolutely essential for further analysis.
Cheers, heke
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[Hi Heke, thank you very much for your help, as you asked, together I´m going to attach the fotos showing the components and tracks around the chip from top and botton views, this board belong to a LG TV.
Thanks again for your much appreciated help,
best regards,
Eduardo Cardona
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Hi @edcardona,
Thank you for the pictures. They help a lot.
This one is tough to crack.
The IC is obviously an adjustable LDO.
Pin-out-wise the closest one I could find is Semtech’s SC4215, but pin #5 seems not to be N.C: (is probably a soft-start pin) and pin #1 is grounded. LG appear to use the SC4215 in their great products, but the “V337” is certainly not that. I’d assume it is a customer variation of the Semtech’s standard chip. They sometimes use Diodes AP2132 too, which has PG function on pin #1, thus again not an exact match.
If your target is to fix a malfunctioning board, perhaps the most straightforward method is to replace the whole board.
https://www.amazon.com/Main-Board-EAX68253605-EBT66213402-65UM6900PUA/dp/B08P11QGBS
Cheers, heke
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Hi Heke, thank you very much for your help, I’ll probably replace the board like you suggested, but in the meen time i’ll try to search one last time on those chinese sites like Alli express just to be sure that nothing new came up and then if the tv´s owner agrees i’ll buy that board. Many thanks!
Eduardo.
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Hi @edcardona,
Yes, it is a good idea to search the Chinese sites.
You could also measure the voltage at the pin 6 to verify that the chip is bad (may also be disabled or shorted, in which case the problem is somewhere else).
You could also measure the resistors R9327 and R9328 to guess the output voltage (assuming that the reference voltage is 0.8V), and then try replacing the chip with e.g. some 3-terminal regulator (won’t be an elegant solution, but may work).
Unfortunately the service manuals for the products using that particular board do not contain schematics, for some unknown reason.
Cheers, heke
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Hi @edcardona,
One candidate for the chip is GMT’s G9822, 2A LDO with 0.6V reference.
GMT does not list it on their web page (even in EOL)
http://www.gmt.com.tw/product/tree.php
However it is listed on a selection guide (page 12)
http://kingpex.com/wp-content/uploads/2020/02/2020-Product-Selection-Guide-GMT.pdf
Could not find the datasheet. Perhaps contacting GMT would yield something?
Cheers, heke
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