Identify a burnt & disfigured IC chip on power board of DVD player

It looks like that chip was exposed to very excessive voltage and current (as in mains power) so there may be other problems that caused this failure.

Check if this is a power supply card (between power input and other circuit boards. - These other cards may provide insight into what voltage is used)

If it is a power supply card, this might be a voltage regulator IC.

If it is a regulator, it is probably a switching regulator (if it is linear it might be a NJM78LR05BD)

Trace the components connected to the chip to see if they are typical of a switching regulator.

You may need to look through datasheets of 8 pin dip regulators to see typical circuits.

There are only about 15 (8 pin dip) regulators out there, so it may be possible to figure which it is by comparing with their reference designs.

If it isn't a power supply, try to figure out its function.

Yes this is from a DVD player by the brand martin ranger, it's the power supply board . I wasn't good with identifying the ic chip , will try to research abit of those.

It certainly looks like a mains to DC converter - the optocoupler and transformer rather confirm it.

Your next step should be to trace out the complete circuit and draw a schematic of it - it looks like a single sided pcb so it shouldn't be too hard. Mark up the component values on the schematic and post it here.

It will be much easier to find the regulator chip type.

Then test all the components you can - as Doug says the chip failure may have been caused by something else.

Alternatively look for a replacement board:

This looks promising but not currently available:

https://www.amazon.in/Voltage-Player-Power-Supply-Circuit/dp/B00MJVKBRA

Here's another:

https://uk.dhgate.com/product/1pc-ac-dc-universal-5v-12v-switching-power/421056711.html?f=bm%7cGMC%7cpla%7c1670763299%7c…

MK

How do i know if the alternative board is compatible with current? Their spec only state 12-, 12+, +5v .

Doing circuit drawing is a challenge as i am a mechanical guy , I didn't went through the details during my academic days. I will try.

The good way to do it would be to power up the DVD player with a couple of suitable bench type power supplies and measure the current - that's what I would do but if you don't have the gear then that isn't an option.

You could buy a spare part from the original manufacturer -  if they are interested (or ask them for a service manual).

Or you could punt $8 and see if it works

Your choice.

MK

I emailed martin ranger for parts and service manual, waiting to see their response. I can use the psu for desktop to try power up. We shall see how it goes.

npsp I would also go with michaelkellett suggestion to try one of these boards as they are so very similar in components and layouts. Probably they are re-works of an original board design - either by the same company, via sold IP rights or plain clones. Some of the images will show their IC values; e.g. DK1203

Maybe they use the same IC....

https://www.ablic.com/en/doc/datasheet/voltage_regulator/S1701_E.pdf

Sorry Doug, I'm missing something here.

I can find the data sheet for the DK1203 and it's a flyback mains to low voltage regulator for optocoupled feedback in an 8 pin DIL package as I'd expect.

I can't see where the S1701 fits in.

MK

Thx everyone for responding, i will try with after market power supply like this. I think need to swap the pins position at output. Btw i saw some +5v, +12v and -12v giving out differ ampere from differ manufacturer board, would that be a concern choosing one?

This above shown board gave 5v2A, +12v200ma, -12v200ma.