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Old 07-01-2020, 06:41 AM   #41
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Default Re: Philips 37PFL4606 No Power

What were the part numbers that you replaced D901 and Q902 with?
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Old 07-01-2020, 07:41 AM   #42
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Default Re: Philips 37PFL4606 No Power

Replaced them with these on the photo
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Old 07-01-2020, 07:52 AM   #43
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Default 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

Last edited by dick_barton; 07-01-2020 at 07:56 AM..
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Old 07-01-2020, 07:59 AM   #44
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Default 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
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Old 07-01-2020, 01:28 PM   #45
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Default 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

Last edited by trunks81; 07-01-2020 at 02:44 PM..
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Old 07-01-2020, 03:02 PM   #46
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Default 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.
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Old 07-01-2020, 03:20 PM   #47
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Default 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?
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Old 07-01-2020, 03:49 PM   #48
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Default 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

Last edited by trunks81; 07-01-2020 at 03:51 PM..
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Old 07-01-2020, 04:43 PM   #49
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Default 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?
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Old 07-01-2020, 10:59 PM   #50
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Default 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
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Old 07-07-2020, 09:40 AM   #51
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Default 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
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Old 07-07-2020, 10:36 AM   #52
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Default 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)

Last edited by dick_barton; 07-07-2020 at 10:42 AM..
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Old 07-07-2020, 10:42 AM   #53
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Default Re: Philips 37PFL4606 No Power

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

Last edited by trunks81; 07-07-2020 at 10:44 AM..
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Old 07-07-2020, 12:04 PM   #54
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Default 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?

Last edited by dick_barton; 07-07-2020 at 12:38 PM..
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Old 07-07-2020, 10:06 PM   #55
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Default Re: Philips 37PFL4606 No Power

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