Samsung PN50A510 P3FXZA Plasma Cycling On/Off

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

Question on reflow....do u just put entire main board in over at 375 for 20 min?

What about the pastic components on the board?

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

Disregard reflow question i figured it out but it didnt fix issue...will try replacing c102

[tom66]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

20 minutes? No.
That's called "cooking" the board, not reflowing it!

You also need flux on the component you want to reflow.
5 minutes, 220C maximum temperature, and ramp oven up slowly, then allow board to cool down in oven slowly.

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

i did 9min at 385f .....it didnt fix.....

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

i left in oven to cool down 45min

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

thanks for ur good advice tom....forgot aboyt flux.....should i try again with flux ?

im thinking maybe its the infamous bad cap issue c102 like kevin and many many others had

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

Hi..i know this thread started a few years ago...but i have samecsymptoms of tv cycling on and off indefinitely....all voltages coming from ps good....i isolated to main issue per experts in here telling me to jumper pins 3-4 on logic and disconnect lvds from logic to main

I did this and tv still cycles on and off but during the on cycle i now get a crisp bright test pattern display on the screen....due tonthis im being told its probably a main board issue as my research was directing me towards

However....i have done all the fixes per this thread and tv still cycles on and off....

I refllowed main board 385f for 9 min in oven
I replaced c102

Afny input would be appreciated......if main board was affordable like under $50 i would replace it but as we all know this main hard to find and over $100.....this tv isnt worth repairing at that cost.

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

There is an ic101 in the repair kit for this main board......but i haventvseen anyone needing to replace it in here to fix their issue...

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

Fyi

C131 is located on top side board not bottom as c102 is

They are both 47uf 10v caps

Ic1203 is on top side board
Ic101 is on bottom side board next to c102

[vinceroger69]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

if the repair kit is cheap enough i would change both the ic s and both capacitors that way you have ruled them out all because no one else has seemed too of changed the ics does not mean they have not failed on your set you may just be the unlucky one

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

thanks vince

ill replace c131 (1.00 arrow.com) and ic101 $1.00 ebay)

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

fyi ic1203 i belive is for audio issue only....which i dont have

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

and im using low esr elrctro alum cap i just mount the through hole style legs to thr surf mount pads

for testing purposes should work fine...

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

Hi vinceroni....i replaced both caps c102 and c131...tv still cycles on and off

Im waiting for ic101 shipment

[shelby5041]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

Aaron said he has never had to replace the ic...he said c102 and c131 should fix

in my case thats not true

[E--Man]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

Hi,

Can I use a 47uF Electrolytic Capacitor I have in hand with the same or higher voltage?

[vinceroger69]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

Hi,

Can I use a 47uF Electrolytic Capacitor I have in hand with the same or higher voltage?

as long as you get the polarity rite when you fit the capacitor you should be fine

[E--Man]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

as long as you get the polarity rite when you fit the capacitor you should be fine

Many thanks for the quick reply!

[budm]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

BTW, the white bar on that Tantalum cap = Positive.

[vinceroger69]

Re: Samsung PN50A510 P3FXZA Plasma Cycling On/Off

BTW, the white bar on that Tantalum cap = Positive.

Thanks budm i was trying to find that information too add to my reply