I have a psu pcb that the vs and va voltages shut down after about 3 minutes working
I checked for poor solder joints, all ok
psu pcb type BN44-00442B
has anyone got a schematic?
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Re: LG 50pg30
Start by checking the fuse on the y sus pcb if this is blown,
I would next check the y buffer pcb's as well,
If the fuse is open circuit, both pcb's can be faulty,
removal of the buffer ic requires skill and some special tools
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Re: Pansonic TH-42px70 st/by light flashes 10 times
Thanks, very similar to my circuit
The power supply is ok
There is a problem with the main pcb
I am looking at all the regulators on the main pcb
The sos tp is at around 1v which means there is a problem somewhere
what I think is happening is that the regulators are under the control of a microprocessor, and these are not being switched on,
I will have to go thru all of the protection circuitry
I will post more when i get to the cause
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Pansonic TH-42px70 st/by light flashes 10 times
This plasma the st/by light flashes 10
by disconnecting the signal pcb the screen comes on with a whitish picture
i have being checking the output voltages of the power supply while it is working
and found no FVc voltage on pin 8 and 9 of connector p6
Has anyone got a schematic of the psu, the only markings on it are TNPA4221
Thanks
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Re: Do LCD sets age and change colour?
what can happen is the heat from the ccfl lamps and the screen in some cases, make the plastic that covers the front of the lcd screen go discoloured in patches across the screen. you will notice this on a white screen,
also the lamps do go dull after a lot of use, you just have to look at an old laptop and put it beside a new one with a similar screen type
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Re: Samsung LE40B530P7 White out
more than likely the t-con board or the lcd panel itself
here is a link on how to test the psu
[url]https://www.youtube.com/watch?v=wrD1d-a2fnA[/url]Re: Samsung LE40B530P7 White out<br ...1d-a2fnA[/url]
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Re: New job--reparing TV sets at local dump! Samsung 42Q97 problems, stumped!
check this link the power supply sounds like yours
[url]https://www.youtube.com/watch?v=mO3alTe-Ldg[/url]Re: New job--reparing TV sets at loc...alTe-Ldg[/url]
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Re: Samsung BN44-00261B power board backlight inverter fail
check this link there is a power supply that is similar to yours
[url]https://www.youtube.com/watch?v=wrD1d-a2fnA[/url]Re: Samsung BN44-00261B power board ...1d-a2fnA[/url]
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Re: Samsung LE37A556P1F Flashing red light
all Samsung part numbers will start with BN94-
the number you see printed on the pcb, is the pcb type. with no firmware installed , also there will be hardware difference on a pcb with the same number printed on it
always look at the part number printed on a sticker,
ignore the BN40- number on the tuner
it will start with BN94-
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