Philips 37PFL4606 No Power

[dick_barton]

Re: Philips 37PFL4606 No Power

What were the part numbers that you replaced D901 and Q902 with?

[trunks81]

Re: Philips 37PFL4606 No Power

Replaced them with these on the photo

[dick_barton]

Re: Philips 37PFL4606 No Power

Replaced with identical parts as shown in circuit diagram so they are not the problem.

Are you able to check the ESR of C915, C922, C920 & C946

[trunks81]

Re: Philips 37PFL4606 No Power

Now iam beginning to doubt about those parts.. especially the 11N60..
Because transistor placed now is this one

https://sinuss.nl/componenten/halfge...-semiconductor

And if have more faith in these ones.. but they are still on the way.

https://www.ebay.com/itm/5-x-11N60ES...53.m2749.l2649

[trunks81]

Re: Philips 37PFL4606 No Power

C915 = 131uf ESR 0.64 Vloss 11%
C922 = 2341nf ESR 2.1 Vloss 1,4% soldered out of pcb
C920 = 130uf ESR 0.70 Vloss 11%
C946 = 46uf ESR 0.27 Vloss 1% soldered out of pcb

C920 and C915 should be 1U 25V according to schematic strange that iam getting 131/130uf

[budm]

Re: Philips 37PFL4606 No Power

it is not valid to check caps in-circuit due to the fact that there are other components connected to the caps.
If you look at the schematic, you will see that C915 (1uF 25V), C920 (1uF 25V), C922 (2.2uF 25V) are connected in PARALLEL so your readings as shown below from your post do not make sense.
C915 = 131uf ESR 0.64 Vloss 11%
C922 = 2341nf ESR 2.1 Vloss 1,4% soldered out of pcb
C920 = 130uf ESR 0.70 Vloss 11%
I also wonder if PFC IC902 (FAN6961) is damaged when PFC MOSFET Q902 shorted out.

[dick_barton]

Re: Philips 37PFL4606 No Power

Looking at the back of the circuit board in post #1 it looks like IC905 and ZD907 have been replaced. What else do you know has been replaced?

[trunks81]

Re: Philips 37PFL4606 No Power

Ordered FAN6961 on ebay for sure..

I did solder out the normal caps and the smd not so the reading from those two should be good.

I replaced IC905 and ZD907 for to be sure it wasnt the fault, Also i swapped IC902 from an donor board and IC901 replaced with an new one

[budm]

Re: Philips 37PFL4606 No Power

Again, the readings you show for C915, C920 do not make sense, they are 1uF caps so how can they be good if they show 130 uF?

[trunks81]

Re: Philips 37PFL4606 No Power

Sorry i was talking about these two

C922 = 2341nf ESR 2.1 Vloss 1,4% soldered out of pcb
C946 = 46uf ESR 0.27 Vloss 1% soldered out of pcb

Where on the net can i find 603 1u 25V Caps

[trunks81]

Re: Philips 37PFL4606 No Power

Hello

So more news got back the board from repair.. and they replaced again IC905

Main difference now is that i have 13VDC on the 24V so not repaired at all

[dick_barton]

Re: Philips 37PFL4606 No Power

Is that with the mainboard disconnected from the power supply and +5VSB connected to S/B using a 1K resistor

Edit so do you have +5VSB, +12V and +24V (but is currently at 13V)

[trunks81]

Re: Philips 37PFL4606 No Power

Hello that is +5VSB connected to S/B with an 1K resistor, Also on C907 still got 314VDC

[dick_barton]

Re: Philips 37PFL4606 No Power

It looks like the power supply needs to be returned as not repaired.

Edit.
Have you used your meter set to ohms to ensure that you have selected both the +5VSB and the S/B pins?

[trunks81]

Re: Philips 37PFL4606 No Power

problem is repairman claims its repaired and doesnt want to to something about it

[trunks81]

Re: Philips 37PFL4606 No Power

He showed me working pictures of the mainboard.. so i dont get i any more!

[trunks81]

Re: Philips 37PFL4606 No Power

Oke got i back a couple a days ago and it is working,,
He claims that he did notting the last time..

Only i whas so stupid i tought this power supply was the same as the 47 inch,
So i swapped out T803 from the 47 inch board onto the 37 inch board.
Result is that doesnt work !
Only now the 37 inch is up and running only the backlight flickers alot !!

https://photos.app.goo.gl/RWn9BhLw6h7vR3Br8

[trunks81]

Re: Philips 37PFL4606 No Power

Hello

iam looking at the schematics of this tv and i cant indentify the next part FB905 ?
it should measure 60ohms but iam getting in and out of circuit 0.01ohm

[dick_barton]

Re: Philips 37PFL4606 No Power

FBxxx is generally a reference to a ferrite bead or at least some sort of inductor. It may be what I have marked but I cannot read the silkscreen legend

[trunks81]

Re: Philips 37PFL4606 No Power

Sorry i should have marked it out.. but that is the one !!