Re: Samsung HPT4254X BN44-00161A P.S.Dead

Hi

I've changed some resistors smd, I've checked the Viper22A as I have 3 but still 3.2V. Its doing my heading.

Re: Samsung HPT4254X BN44-00161A P.S.Dead

Hi Flocko and thank you for your info. I have resolder entire board and I've changed the fets and the resistors smd and the diodes near the fets so it's still no click.
We are using 230V in the UK and the board was bought from USA and maybe this could be a problem. I have posted the schematic see above. Thanks. Cris

Re: Samsung HPT4254X BN44-00161A P.S.Dead

The "new" PSU was from USA sorry and I don't know if this is any problem as you are using different voltage.

Re: Samsung HPT4254X BN44-00161A P.S.Dead

Hello
I had a PSU which I've managed to fix it but then I've done a short and I burn it and it was dead. Few weeks ago I bought a PSU from UK as was cheap and now I'm trying to fix it.
The voltages I've got just 3.4V at CN807 and nothing else. I've checked the mosfets, bridge rectifiers, caps, controllers etc and still dead. I took the chip ICB802 viper from the old board and I've change it, I changed a new ICP801, I've changed the SUB1 and SUB2 chips, transistors smds. Still no click. Its doing my heading but I'm never give...

Re: New Members - please post your introductions here

Hi guys,

My name is Cris and I'm mechanical design engineer at Fugro in the UK. I have finished the uni in 2004 after 5 year in mechanics, cranes, winches and lifting machineries and 2 years of master degree in business management.
My hobbies are sports, mechanics and electronics so I want to learn more things about electronics and I also need advices and help to fix my PSU.

Best regards
Cris

Re: Samsung HPT4254X BN44-00161A P.S.Dead

Hello

I have attached 2 pictures. I have replaced the mosfets, smd resistors, diodes, capacitors but still no click. Its something on st by I think but I haven't got too much experience to find the problem. That's why I need your help.

Thanks
Cris...

Re: Samsung HPT4254X BN44-00161A P.S.Dead

Hello gents

Could you please tell me what the problem is if I haven't got 5V on stby ? I only have 3,2V or something like that and I don't know why? I have measured everything from that area and they seems to be ok.
Could you please give me some advice for a beginner? I'm not stupid and I've fixed the ex PSU but this one is doing my heading. The PSU came from USA and I'm wondering if its any problem as they are using different voltages?
I'm looking forward to hear from you guys.

Thank you

Re: Samsung PSU BN44-00161a Repair

Hello

I have the same PSU like yours but mine is totally dead. This is the second one as the first one I managed to fix it and afterwards I've shorted and is gone now.
Double check the Mosfets from the heat sink and the diodes SMD from the board. There are few dead on the other side and also the SUB1 and SUB2. On SUB 1 you have a chip and 4 transistors and a diode and this should be replaced. Let me know if you done something. Good luck...