Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
Update: the TV is fixed!
I was able to purchase a known good used power supply for 37 Euros (43 USD) and now the TV works properly.
The faulty components on the original power supply were IC801 (UBA2071AT) and IC901 (NCP1271). I will try to obtain these two ICs and change them using soldering paste and heath gun. I'll report it once the original PSU is also fixed.
Thank you all for your help!...
DrOetker
Member
Last Activity: 09-18-2022, 04:12 PM
Joined: 09-01-2020
Location: Zagreb
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
Resistance between VCC (pin 8) and ground (pin 6) on IC902 is 233k ohms in both directions.
I also measured voltage across Q915 (part of the brown out circuit, equivalent to Q906 on trunks81's board) anq Q918 while the mainboard was plugged in.
Q915:
B = +6.12V
E = +5.84V
C = 0.00V
Q918:
B = 0.00V
E = 0.00V
C = +314V
That means that on my board the brown out circuit is active, is that correct?
...Last edited by DrOetker; 09-06-2020, 01:44 PM.Leave a comment:
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
When I remove MOSFET Q802, low resistance across pins 17 and 22 remains the same (3.6 ohms), nothing changes. Q802 was indeed my first suspect so I tested it before, it is fine and working properly. I tested it again, just to make sure, and it is working properly both in off and on state.
I realised that I did not test switch Q907 while the PSU is connected to the motherboard so I tested that now. I also tested IC901 and IC902 (while doing all the testing I used C907 leg...Last edited by DrOetker; 09-05-2020, 12:37 PM.Leave a comment:
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
Thank you R_J for clarifying this.
I was searching for more information on some russian sites (since these Philips TVs were popular in eastern Europe) and found this video:
[URL="https://www.youtube.com/watch?v=OR-zpuNYXZ0"]https://www.youtube.com/watch?v=OR-zpuNYXZ0[/URL]
It was a 32pfl3606H/60 that won't turn on, with good +5VSB voltage and no current on +12V and +24V, exactly like mine. Turns out that IC801 (control chip for CCFL backlight)...Last edited by DrOetker; 09-05-2020, 06:52 AM.Leave a comment:
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
Thank you for your input trunks 81 and dick barton.
I have indeed just read your threads and imho it seems that we have similar problems with our boards, although please do note that our boards are not the same (yours is chassis TPM7.1E for Phillips 37'' and 47'', mine is TPM6.1E for 32'' and 42''). There are components that are not the same, for example IC905 is a totally different chip (TOP264VG vs TNY277PN-TL).
I was reading about IC905 (TNY277PN-TL) and looking at the diagram,...Last edited by DrOetker; 09-04-2020, 04:42 PM.Leave a comment:
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
I am using 1k resistor when i jump +5VSB to S/B and this is when voltage start to fluctuate. I also tried to jump +5VSB to ENA (BLon?) via another 1k resistor, but this doesn't change anything.
Thank you for your suggestion, i tested those components.
[B]R959[/B] resistance is 22 ohms, tested in the circuit.
[B]D916 diode[/B] - I tested it in diode mode in the circuit, readings are 0.52V and 2.98V. Then I desoldered it, tested it in diode mode agan,...Last edited by DrOetker; 09-04-2020, 08:38 AM.Leave a comment:
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
+5VSB is holding fast and steady at +5.1V when MB is connectet, it's also holding fast at +4.7V when the MB is disconnected and no +5V-S/B jumper in place. It is fluctuating only when I plug in +5V-S/B jumper.
Q907 (BC857C) voltages:
1 pin (base) = +7.43V when MB is disconnected, when I place the jumper it fluctuates from +1.45V to +1.7V.
2 pin (emitter) = +7.43V when MB is disconnected, after placing the jumper it fluctuates from +2.09V to +2.40V.
3 pin (collector)...Last edited by DrOetker; 09-03-2020, 12:57 PM.Leave a comment:
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
Okay, so I connected +5V and S/B wire (PSon) via 1k resistor, and the voltage readings on CN903 connector are:
Still no voltage on +12V and +24V rails.
S/B voltage fluctuates; +4.7V and then gradually falls to +2.1V in 3-4 seconds, then rises back to +4.7V, stays still at +4.7V for a second or two, and then cycles again.
+5V voltage fluctuates as S/B voltage, of course.
I also connected +5V and ENA (BLon) with another 1k resistor, nothing changed.
It...Last edited by DrOetker; 09-03-2020, 11:09 AM.Leave a comment:
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
Q902 looks fine. All caps look OK, there in no visible damage on any of the components.
Top of C922 is also looking good.Last edited by DrOetker; 09-02-2020, 12:55 PM.Leave a comment:
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Re: Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
I measured it in the circuit. I'll do that, thanks for the help!...Leave a comment:
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Philips 42PFL3606H/58 Not powering on, no power indicator - PSU problem?
I'm trying to fix my grandpa's TV - Philips 42PFL3606H/58 (TPM6.1E). It was working normally up until now, he said that while he was watching the TV at first the display went off, and after around 30 minutes, he lost the sound also. He tried to turn it on, but it wouldn't turn on anymore.
While plugged in it draws 9.7W, there is no red and green lights. While pressing the remote (power button, prog +-, etc.) or the buttons located on the device, it reacts and the red light blinks after the keypress. After pressing the power button, total power consumption falls to 0.1W, and after...Last edited by DrOetker; 09-02-2020, 12:43 PM. -
Re: New Members - please post your introductions here
Hello, my name is Oetker and I live in Zagreb, Croatia.
My formal education is that of a doctor of medicine and during my working hours I "fix" people. In my spare time I occasionally try to save broken electronics and finding this forum has helped me tremendously.Leave a comment:
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