Philips 46pfl5505d/f7 dead

[ivtec]

Hi guys;i have here an lcd tv that i'm trying to save that i found in the dumpster,
Philips 46pfl5505d/f7 that is completely dead, no standby led no voltages at Cn2'
i checked Diodes in circuit ZD951,D950,D951 and all are short in circuit,
i took them all out of the circuit and tested them and only D951 is short out of the circuit ,if i replace D951 will it fix the tv or do i have to look up for other bad components? Thanks and Happy New Year to you all.




https://www.badcaps.net/forum/showthread.php?t=48765

[ReeceyBurger123]

Re: Philips 46pfl5505d/f7 dead

Dunno about any other common issues with these Id say give the diode a shot. If they are in parra just run the set with the shorted one removed set will work but replace all 3 at the same time.

[ivtec]

Re: Philips 46pfl5505d/f7 dead

Dunno about any other common issues with these Id say give the diode a shot. If they are in parra just run the set with the shorted one removed set will work but replace all 3 at the same time.

Thanks ReeceyBurger123;I'm trying to find ZD 591, PK 5920 the tall Diode but can't find it anywhere,i measured it with diode setting.
I measured the ZD591 5920 and Positive probe on cathode and negative on anode measures OL and positive on cathode and negative on anode 0.678,
is this normal? thanks

[ivtec]

Re: Philips 46pfl5505d/f7 dead

Hi guys which of these To-220 is good for the Replacement of D951,and D950? and how do i connect it to both D950,951? can you make a schematic please, thanks and Happy New Year




http://www.mouser.com/Semiconductors...x1mj?P=1z0z73r

[ivtec]

Re: Philips 46pfl5505d/f7 dead

Hi guys which of these To-220 is good for the Replacement of D951,and D950? and how do i connect it to both D950,951? can you make a schematic please, thanks and Happy New Year




http://www.mouser.com/Semiconductors...x1mj?P=1z0z73r

Hi there anybody there? can you please advise

http://www.mouser.com/Search/Product...4-APT10SCD120K

[Agent24]

Re: Philips 46pfl5505d/f7 dead

Thanks ReeceyBurger123;I'm trying to find ZD 591, PK 5920 the tall Diode but can't find it anywhere,i measured it with diode setting.
I measured the ZD591 5920 and Positive probe on cathode and negative on anode measures OL and positive on cathode and negative on anode 0.678,
is this normal? thanks

Did you measure in-circuit or out of circuit? I think ZD591 is in parallel with the other 2 diodes. If you measure in circuit you will get false readings.

But, zener diodes can't be tested with normal diode test for correct breakdown voltage, only to check if they're not open\shorted anyway.


As for replacement of the diodes...
Going from the other thread, the diodes are SB260s. That's 2A at 60v.
(https://www.badcaps.net/forum/showpo...3&postcount=32)

A single SB580 as suggested should work. The board looks like it already has a space for a single, larger, DO-201 package diode anyway.
You could get http://www.digikey.com/product-detai...0CT-ND/3504367

It doesn't have to be a TO-220 package, although one of those with a heatsink might last longer. I do suspect it's more likely due to variances in forward voltage, one of the original SB260s probably just ended up taking more current and overheating.