Re: Samsung - no standby - already replaced all caps but still
Any help choosing which PSU to buy is appreciated. Thanks...
sciclunam
Member
Last Activity: 02-05-2016, 04:32 PM
Joined: 01-21-2016
Location: Valletta
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Re: Samsung - no standby - already replaced all caps but still
Any help choosing which PSU to buy is appreciated. ThanksLeave a comment:
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Re: Samsung - no standby - already replaced all caps but still
Hi all. First of all thanks to your dedication and time (especially budm). Due to time restriction and much more damaged components than I had anticipated in the PSU (some of them are not even available in my country) I was considering buying a new PSU.
I have found this supplier in the UK which sells the A version at a good price; ie: BN44-00208A. Mine is B but you said it is compatible right?
On their website they have several BN44-00208A all using circuit board PSLF171501B (like mine) but...Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
SH*t. I removed the IC already and one of the legs got damaged whilst removing it. Maybe I will try and solder a piece of wire instead of the leg. If I do... could you please let me know the exact location where to place the fuse?Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
OK... so I need to replace the IC and place a 2A fuse instead of RB806. Shall I use a normal 2A fuse (12v?) and solder it in place of RB806 or I can leave RB806 there and solder it underneath?
ThanksLast edited by sciclunam; 01-29-2016, 04:56 PM.Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
With the ic still on board there is no resistance from the GND pin to any of the 3 drain pins.
Update: removed the IC and still no resistance. Also apart from faulty RB806, also there is no resistance in RB801.Last edited by sciclunam; 01-29-2016, 04:50 AM.Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
Its Q0365R. VJ36....Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
I understand.Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
I have not removed it from the board yet. Will do and let you know. ThanksLeave a comment:
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Re: Samsung - no standby - already replaced all caps but still
Thanks. I WANT to go forward with the repair... but in the meantime my daughter is without a TV
Unfortunately I can't find the ICB801S locally and must be ordered which will take more time plus we might find other parts that need replacing. What I am afraid of whether there might be also damage to the Main Board or I can rest assured that the problem lies only within the PSU?
Also would you know whether PSU BN44-00213A is compatible with mine as a replacement?
ThanksLeave a comment:
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Re: Samsung - no standby - already replaced all caps but still
So it seems that it might be getting unfeasible to fix or aren't these components that expensive? Shall I replace the resistor RB806 and see if it blows again before replacing ICB801S? Is there a way I can test this before buying a new one?
PS: I have noted that your schematic is of bn44-00208A... mine is 208B (not A) - or they are interchangeable?
Thanks...Last edited by sciclunam; 01-27-2016, 05:13 PM.Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
It's a manual DMM (Wavetek) The resistor RP806 is not giving any reading in ohms and when checking in Diode mode (for continuity) it does not beep (should it?) I have attached some photos to make sure I am checking the right resistor as you have mentioned a fuse which I cannot see.
Requested Photo of the circuit from the top attached.
PS: Yesterday when I saw that spark a component NT811S (photo) got damaged but it does not seem to be affecting as the voltage in the main...Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
To check resistance... I assume without power and DMM set to ohms. Do I need to remove it from the circuit.
Will send you photo later - I have to reopen TV....Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
Is the attached any good?...Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
That is what I am getting. 311V at the main capacitor but I can confirm at the std-by pin (pin 3) there is no voltage.
What next to check after the main capacitor?...Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
I have just checked these....
VAC in - 220V (correct European voltage)
VAC in middle pins of rectifier - 220V
VDC out of Rectifier all the way to the Main Capacitor is 305V.
So I assume this means that the bridge rectifier needs replacing as I am sure it was around 325 VDC earlier today.Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
Sorry I did not notice page 2... see below...Last edited by sciclunam; 01-26-2016, 03:16 PM.Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
So if I get 325VDC at the capacitor it would mean that all components before it (Bridge Rectifier, PFC diodes, etc) are good? I will check it shortly.Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
Thanks BUDM for the explanation.
The input side is 230VAC when checking CN801, ie: where the AC wire plugs on the board. The Main Capacitor is reading 305V but the be honest I am sure it was 330V before I saw a spark coming out from the Bridge Rectifier whilst checking some components and the fuse blew (I guess I touched something by mistake). I will replace the Bridge Rectifier BD8016S it as it is giving 305V. Shouldn't this give 330V when checking its + and - pins?
...Last edited by sciclunam; 01-26-2016, 02:51 PM.Leave a comment:
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Re: Samsung - no standby - already replaced all caps but still
Hi All. Thanks all for your great help.
First of all I was mistaken with regards to the reading across the main capacitor. It is 305v.
I have taken several readings starting from the AC entry and have attached photos of each. What I find strange is that I got no reading from LP810 (power supply) neither at the input nor at the output side! (maybe I am checking the pins the wrong way?)
The above readings were tested with all the boards disconnected. I have checked the output pins...Last edited by sciclunam; 01-26-2016, 01:00 PM.Leave a comment:
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