broken power supply Eaglerise SDT160FMS

[serak]

Hello,

Could anyone help me with the repair of this power supply for halogen lamps, please?
It is Eaglerise SDT160FMS. Unfortunately I have not found a diagram.
The first part includes a touch control dimmer NB7232, which controls (via triac and Photocoupler C1010) the second part, switching power supply with switching transistors KSH13009. No part visually looks like burnt.
Unfortunately, I have only a digital multimeter Mastech MY64.

I have partially tested NB7232. At pin 1 is DC 5V. Also at pin 8 (TRIG) is 5V DC. Because MY64 can also measure the frequency, I have tried to measure the frequency at the TRIG. There was 100Hz. Unfortunately, I do not know how to measure duty cycle. Although I have a simple oscilloscope 2MHz, I do not have isolation transformer and experience, so I'm afraid to use it in such type of circuit.
I also tested all the diodes (without desoldering) and they seem to be OK. I also desoldered both switching transistors and measured hFE. The measured value was 30, so they could possibly be ok.What next?

I appreciate any help.

[jiroy]

Re: broken power supply Eaglerise SDT160FMS

Maybe this can help ..

[serak]

Re: broken power supply Eaglerise SDT160FMS

Thank you. This datasheet i have found. On the basis of this datasheet (and datasheet of LS7232, which is older 15V equivalent), I actually made above mentioned voltage and frequency measurements.