Philips TV unknown pwm controller in PSU.

[eurgenca]

Hello.
I have philips tv 42pfs4012 chassis kts17.1e la. Found service manual but power supply only has shematic without part list.
So I can't find any info for pwm chip. 
Can someone help please.

Thanks, Sebastijan.

[eurgenca]

If this help.

[fzabkar]

I couldn't find the part, but I expect it is made by NXP. The "t" looks like an NXP manufacturing site code.

Something like this:

https://www.nxp.com/docs/en/application-note/AN11588.pdf

[eurgenca]

Yeh, pinout is not same.
Strange is that google can't find nothing. I try "qet, qet30r, qet50, 30r50" and completely nothing.

[eurgenca]

Hmm. I realize that this is generic chinese board and not made by philips.

This MS3463S PB801 board share a lot of other manufacturer but all share same manual without part list. What chinese's trying to hide in this PSU?

So far found this, same pinout.
Can someone advise if one of them will do the yob.

https://datasheetspdf.com/pdf-file/824155/LeadtrendTechnology/LD7530/1
https://datasheetspdf.com/pdf-file/1246108/FairchildSemiconductor/SG6848TZ1/1
And one more
https://www.onsemi.com/pub/Collateral/NCP1251-D.PDF
https://datasheetspdf.com/pdf-file/637352/FairchildSemiconductor/SG6859A/1
https://pdf1.alldatasheet.com/datasheet-pdf/view/1221279/LEADTREND/LD7536R.html

[Andy Watson]

This one has the "R" suffix.

http://www.datasheet39.com/PDF/824157/LD5530R-datasheet.html

But otherwise appears very similar to the LD7530.

[fzabkar]

See this thread:

http://monitor.espec.ws/section27/printview274444.html

The OP seems to be saying that his MS3463S PCB had a chip marked "5A2R". That's an NCP1251BSN65T1G.

[eurgenca]

Hello.
O.k. I found this on aliexpress it seems that is replacement from serie N83Gxx, but guess what?
Completely no data for this chip 

https://www.aliexpress.com/item/4001047685082.html?spm=a2g0s.8937460.0.0.98552e0etk44Qz

It looks like this tv is going to trash.

[Andy Watson]

Either, it is a direct replacement - in which case the existing datasheets apply, or it is not a direct replacement - in which case it is useless.

Have you tried ebay ? Here is one (there are plenty of others), although I am sure you could do much better if you spent some time searching your local ebay.
https://www.ebay.co.uk/itm/202856505223
If you do not want to purchase via ebay use it as a source of contacts - try searching or contacting the vendors directly.
If you want to substitute note that the LD5530R data sheets hints that the device is based on a UC384x (pin descriptions, pin 2, page 2).

[fzabkar]

What is wrong with my suggestion?

[eurgenca]

I can use ncp1251x, but which one.
1. there are 2 frequency 65 and 100 kHz
2. what is the difference with protection, there are latch and autorecovery?

I can use either LD5530R but I presum that I have only one try.

[fzabkar]

"5A2R" is NCP1251BSN65T1G.

[eurgenca]

Parts ordered. Let's wait some time.

[eurgenca]

Well. Parts arrived and PS works fine. I ordered LD5530RGL and for now looks good.
Andy Watson and fzabkar thank's for help.