Philips 42pfl7603d/10 dead

[finntricky]

Re: Philips 42pfl7603d/10 dead

already check it, and fine, but no voltage though it or to it, same with all other diodes.

[Moreno83]

Re: Philips 42pfl7603d/10 dead

What T-con goes with this tv again? Then i'll install the boards on a frame and i can measure the voltages for you...

Back of the power supply still ok? No burn marks etc..

[budm]

Re: Philips 42pfl7603d/10 dead

already check it, and fine, but no voltage though it or to it, same with all other diodes.

How did you test it? Were you looking for the Voltages?
I request you to test the resistance, not Voltage and no power to the TV.

[finntricky]

Re: Philips 42pfl7603d/10 dead

What T-con goes with this tv again? Then i'll install the boards on a frame and i can measure the voltages for you...

Back of the power supply still ok? No burn marks etc..

no burn marks that i can see, and thank you for getting your boards out, but i think im on a losing battle, with this one, and may just put it aside untill i can come by a power supply.

[finntricky]

Re: Philips 42pfl7603d/10 dead

How did you test it? Were you looking for the Voltages?
I request you to test the resistance, not Voltage and no power to the TV.

yes i was looking for voltage, tryed to follow voltage from mains and across F2 it goes though some resisters and reduceing the volts down to 7v AC at a SM cap and then cant get any think after, so then tryed traceing from 3.3 stb pin back into the board and again cant seem to find any voltage,
so any idea as to what resistance i should get, and from what points do i test ?

[budm]

Re: Philips 42pfl7603d/10 dead

So you did not do the resistance test as I requested, and also the Voltage test on the cap as I requested:
Post 20:

Check the resistance of D950, ZD951, ZD902 for very low resistance in both directions.
Check the to see if you have about 325VDC between the two legs of C902.

[finntricky]

Re: Philips 42pfl7603d/10 dead

Check the resistance of D950, ZD951, ZD902 for very low resistance in both directions.
Check the to see if you have about 325VDC between the two legs of C902.

set my meter on 2000, D950 red on black end of diode and black on silver end =255, reversed =over 2000 so set meter to 20k and got 2.10.
ZD951 = 256, reversed =over 2000 so set meter to 20k and got 3.12.
ZD 902 = 634, reversed = 1033.
C902, is this the main cap,? as on my board it is C808 and no voltage

[budm]

Re: Philips 42pfl7603d/10 dead

Look for C902.

Pictures provided by shopjimmy.

[Moreno83]

Re: Philips 42pfl7603d/10 dead

Nah your not on a losing battle! Lets start with the suggestions that budm is giving you. I can send you my PS if you pay for the shipping cost. But try to fix yours first!

[finntricky]

Re: Philips 42pfl7603d/10 dead

Look for C902.

Pictures provided by shopjimmy.

that one, sorry did'nt even look at that because of the voltage you said, so thought it must be the main cap you was after, but yes, tested and got the 335v

[finntricky]

Re: Philips 42pfl7603d/10 dead

Nah your not on a losing battle! Lets start with the suggestions that budm is giving you. I can send you my PS if you pay for the shipping cost. But try to fix yours first!

thank you, your so kind, but like you say we will see how it goes.

[budm]

Re: Philips 42pfl7603d/10 dead

OK, since the diodes in the cold side are not showing Low Ohm reading, looking at the 3.3VSB drive circuit, I can see one commonly fail snubber diode ZD908 (P6KE300A), you should unsolder one leg so you can lift one leg off the board and then test it in Ohm mode and in diode mode.
Also check the Fusible resistor R901 (1 Ohm) to see if it shows around 1 Ohm.

[Diah]

Re: Philips 42pfl7603d/10 dead

on first post you wote you placed worked PSY and result same.. so i wrote in post No 2 SSP. dont spend time and nerve on it.. no order signal from SSB to this Delta, refer to Delta training

[finntricky]

Re: Philips 42pfl7603d/10 dead

OK, since the diodes in the cold side are not showing Low Ohm reading, looking at the 3.3VSB drive circuit, I can see one commonly fail snubber diode ZD908 (P6KE300A), you should unsolder one leg so you can lift one leg off the board and then test it in Ohm mode and in diode mode.
Also check the Fusible resistor R901 (1 Ohm) to see if it shows around 1 Ohm.

ZD908 reads 1860 ohm in direction of flow, and no reading in the reverse mode on ohm set meter at 2000, diode mode is also correct,
r901 reads 1.4 ohm set meter at 200

[budm]

Re: Philips 42pfl7603d/10 dead

BTW, so both power supply boards do not have 3.3Vsb when it is powered by itself, right?

[budm]

Re: Philips 42pfl7603d/10 dead

next section to check will be the DCV between the two legs of the startup/running cap C912, and also between the two legs of Aux supply cap C906.

[finntricky]

Re: Philips 42pfl7603d/10 dead

ok, this don't look good, C912 = 0.92v, and C906 = 0.33v and slowly drops, but caps are fine, as have already had them out and checked ESR.
BTW, i only have the one power board,

[Moreno83]

Re: Philips 42pfl7603d/10 dead

I took the working powersupply and plugged in the mains. No other boards connected.

I measure only 3.3V on the 2 diodes on the picture.
I do not measure the 12V etc but thats because the mainboard turns on the rest of the board.

Do you got 3.3v?

[Moreno83]

Re: Philips 42pfl7603d/10 dead

Ps , they are diodes D950 and D951. So the PS only gives the 3.3v standby which is going to the mainboard.

If you don't have the 3.3V on your power supply then something is wrong. If you do have the voltage then the mainboard does not turn on the PS to generate the other voltages.

If i need to measure something let me know!

[Moreno83]

Re: Philips 42pfl7603d/10 dead

I measure 32V DC on C906 and 10V on C912