PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

[vikivng]

Hi guys pls can someone help with this set..
Tv doesnt not power on.
No standby light.
There is a burn mark by the leg of D501 diode.
The diode tests short in both directions.
I have been reading this usually means the diode is faulty? As normally would be open.
I have not yet taken voltages since this is obviously short I would like to replace it.
Can someone help me with a substitute for this diode since it seems not to be the standard type?

[vikivng]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

Another pic showing where diode was removed from.

[nomoresonys]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

yep its bad, look at the diode what are all the letters and numbers on it?

[vikivng]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

Hi there,,many thnx for the quick reply
Markings are T2D 1D

[lotas]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

D501 - st02d-170

[petehall347]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

Sidac / Uni-directional Thyristor (G1V Series)
surge protector

[vikivng]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

many thanks

[William1967]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

The diode is not faulty, you also measure the transformer if the diode is still on the pcb. This measurement error is very often made with these power supplies. Measure the diode from the circuit or measure the standby voltage, if it is present then that part is working properly

[nomoresonys]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

i think he measured it out of circuit.

[vikivng]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

Hi sorry didnt see these replies..Yes just to confirm (before I purchase the part as I am still searching for a UK source with less than extortionate postage)
I get a beep in both directions in continuity mode.
I am pretty sure this shouldnt be the case..?? Pls confirm this guys..thnx
Out of circuit.!

[nomoresonys]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

YES, diode is shorted, bad, no good.

[vikivng]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

ok thnx

[vinceroger69]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

if you dont mind waiting https://www.aliexpress.com/item/4000...d=vnnf2ml2JdjJ
https://www.aliexpress.com/item/4001...d=EjBRhsMKrklr

[vikivng]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

thnx..incredible how hard to find this diode is in UK
Hope this isnt breaking the rules but any members have spares of this I can buy from them if in UK??

[nomoresonys]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

thnx..incredible how hard to find this diode is in UK
Hope this isnt breaking the rules but any members have spares of this I can buy from them if in UK??

Good idea, if I was in your area I would send you one.

[Davi.p]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

I get a beep in both directions in continuity mode.

is this in reply of:

Measure the diode from the circuit

?
So did you measure diode or diode location?
And what about the main fuse?
What about: "measure the standby voltage", with diode in place?

[vikivng]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

Hi ,thnx for the replies.
I have been caught up doing other things so only now can I reply.
The main fuse is good which seems strange.
Anyway I have taken voltages with diode still out (it should be safe to turn on the set without this diode for a short time since the diode is for protection?)
Anyway here are the voltages on the psu connector to main board

1= 3.3v
2= 3.1v (yes I now get standby. 2 blinks)
Pins 3-12= 0v
14= 0.4v

Main cap gives me 399v across the legs
C211=3.3v
C201=3.3v

I will measure diode location later today and update. Also voltages with diode put back on the board.

[vikivng]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

Good idea, if I was in your area I would send you one.

Hi there..7 days approx is not too long to wait TBH. How much shall I friends and family" over to you.??

[nomoresonys]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

https://www.google.com/search?q=wher...fi=hd:;si:;mv:[[51.619608899999996,0.0182844],[51.4102022,-0.2816822]]

[Davi.p]

Re: PHILIPS 40PFL7007 TV DEAD. D501 testing SHORT on DMM

if you keep the test point on the main board, SDM , shorted to ground and insert the tv plug in the mains, then wait some minutes , does the status led blinks? does it make 5long 3 short?