Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting TVs and Video Sources
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 01-23-2019, 02:59 PM   #21
Bobo360
New Member
 
Bobo360's Avatar
 
Join Date: Sep 2018
City & State: Italy
My Country: Italy
I'm a: Knowledge Seeker
Posts: 15
Default Re: Samsung PS50A656T1FXXC PSU: BN44-00222A

Quote:
Originally Posted by R_J View Post
The 5.3 volts should supply 7 amps, 5Ω across it would be about 1 amp.
The Va should be able to supply 1 amp, 120Ω should draw about 1/2 amp. If that shuts down the power supply it is time to look at the primary of that circuit and why it can't supply the curent.
If cx810 goes bad or weak it can cause this issue, If you don't have a replacement I would try and exchange it with either CS810 or CS811 and see if the 5.3 becomes stronger
I changed the CX810 capacitor with a new one.
But from the same problem.
I did an extra test, I put the 120 Ohm resistance between Va and GND, I have no problem.

In your opinion, can I put the 5 Ohm resistor between the central pin of the DX805 and GND?

Because I think it can be him or the mosfet QX807 and QX808.

Because I know that we can exclude the primary, since Va works.

What do you think?

Thank you

Bobo360 is offline   Reply With Quote
Old 01-27-2019, 06:08 AM   #22
Bobo360
New Member
 
Bobo360's Avatar
 
Join Date: Sep 2018
City & State: Italy
My Country: Italy
I'm a: Knowledge Seeker
Posts: 15
Default Re: Samsung PS50A656T1FXXC PSU: BN44-00222A

I have done other tests;

I connected between the pin of the DX805 and mass, various resistors:

1. -> 8.9 Ohm, and everything works.
2. -> 5.6 Ohms and everything works well, even if 5.3 is not immediately stable. But then it stabilizes.
3. -> 3.3 Ohm and everything works well.

I make a list of everything I've changed so far, without solving.

CX824, CX823, CX826, CX837, CX838, CX835, CX834, CX822, CX811, CX812.

If, on the 5.3V, I insert a resistance of 8.9 Ohm, it must be blocked immediately.
If I insert a 120 Ohm resistor (there is an absorption of about 40 mA), it works for almost a minute and then goes to lock.


Last edited by Bobo360; 01-27-2019 at 06:11 AM..
Bobo360 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 04:56 AM.
Did you find this forum helpful?