Re: Samsung ps51d550 no sound no picture
have tested between all the test points on the board and no shorts ( beween ve, xout svc vs,svc gnd ect) however i have got low Resistance on 1 leg of the fet to gnd is this a shorted fet or is part of the circuit it is in?
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Re: Samsung ps51d550 no sound no picture
will try to take some pics and post. don't think it is the control board as i have changed that im convinced it is ysus / xsus think my next move will be to remove fets and try testing them out of circuit.
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Re: Samsung ps51d550 no sound no picture
yes when ribbon and ysus cable disconnected all voltages were as they should be.
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Samsung ps51d550 no sound no picture
Hi all have a samsung ps51d550 which i am having problems diagnosing what board or boards are at fault.i have read the other posts on this subject but am still unable to confirm the problem. with everything connected when i turn the tv on there is one click and that is all i get the control board led goes into 5 secs on 2 secs off. there is no change with power disconnected to zsus or when power disconnected to ysus (power is linked from ysus to xsus). it is only when ysus ribon cable to the control board is disconnected that the power supply fires up as it should and i get the 1 sec on 1 sec...
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Re: LG 42PA4500, Stand by only.
c351 is 10v 3300uf
c502 is 80v 330uf
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Re: Fault on panasonic veira th-58pz800b
i know it blown as there is a hole in it can see the inside the chip
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Re: Fault on panasonic veira th-58pz800b
hi TW2005 i have still not got round to sorting this one yet, i have however been practising my soldering skills and am now ready to attempt a repair. the only trouble is that the original ic9303 chip is the one that is blown. excuse my ignorance but the markings on the chip are as follows:
spansion
S29AL016D70TF102
823BBS88 H
04 SPANSION
on the other board ( from the 42" ) the chip looks the same and markings are as follows:
spansion
S29AL016D70TF102
...
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Re: Fault on panasonic veira th-58pz800b
yes the screen defiantly primes its hard to pick up with the camera.
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Re: Fault on panasonic veira th-58pz800b
ideal new d board it is then will keep you posted on progress thanks for your help and advice much appreciated
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Re: Fault on panasonic veira th-58pz800b
thanks for the suggestion tw but a bit beyond my skill set! im only a sparky not to confident soldering small electronic components lol.
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Re: Fault on panasonic veira th-58pz800b
i tried new c buffers with the new board the old board is totally gone so it is displaying to 58" but i hear what you are saying i think the way forward is to try and source the correct d board. is there any way i can test the panel the part that is not working seems to have a slight glow so im fairly sure it is ok.
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Re: Fault on panasonic veira th-58pz800b
Yes the original had no suffix the new has bf so would you say this is the probable cause? and would it be possible to update the firmware to rectify this or just get a board with no suffix?
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Re: Fault on panasonic veira th-58pz800b
have tried reseating cables no change, tried replacing c2 and c3 no change the original logic board had a fault and i replaced this how ever the board i replaced it with was the same number tnpa4439 but it was from a 42" tv could this be the problem? the board looks identical but im wondering if this could be a software type issue ??
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Re: Fault on panasonic veira th-58pz800b
have attached photos of how the screen looks now...
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Re: Fault on panasonic veira th-58pz800b
just a quick up date i have now fitted a replacement ss board as one of the chips was also blown on that. the tv now has a good picture but only on 1/3rd of the screen. am i right in thinking that this is the c2 and c3 buffer boards ? is there any way i can test to confirm this or is there something else that can be causing this. any help or advice would be greatly appreciated.
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Re: Fault on panasonic veira th-58pz800b
hi tom thanks for your suggestion i already watched your video very good and informative. I have tried the lvds cable and it has no effect. i also watched the one on how to test rest of the tv with the main board disconnected i am not able to get the white screen. I dont think the screen is bad as the side that is not working seems to be primed, i am wondering if the fault still lies with the d board or some where else.Last edited by 1967tux; 12-30-2014, 03:46 PM.
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Re: Fault on panasonic veira th-58pz800b
Hi Tom have posted some pics of the screen.
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