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mailforwho
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Last Activity: 02-06-2021, 05:41 PM
Joined: 12-28-2020
Location: Oxfordshire
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?

    Thanks everyone for the help, I'm afraid I've decided I can't spend anymore time debugging this and I needed the dining table back I'm going to sell the TV for spares and repairs in case someone else can make sense of it. Really appreciate everyone's suggestions and sorry I didn't have the time to get to a satisfying conclusion.
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?



    I pulled up BL-DIM to 3.3V and got nothing, sadly....
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?



    Looks like there's some info here:
    [url]https://masterelectronicsrepair.blogspot.com/2020/01/repair-servicing-tv-philips-40pfl7007t.html[/url]

    I think this is the most helpful bit


    [url]https://www.panelook.com/LTA400HL15_Samsung_40_LCM_overview_16750.html[/url] is the panel.

    I'll have a look tomorrow and decide whether I'm going to brave the next steps!Re: Philips 40PFL7007T/12 debug and ...<br /> <br />...
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?



    Thanks for your help - what makes you suspect the backlight? As far as I can tell the BL is only turned on once the main MCU boots, not the standby MCU, but I don't see any sign the standby MCU is finishing boot because it should ground STB once it does to bring up everything else? Are there failures of the backlight that can take out the board in general?

    Is taking out the panel/diffuser just so I can see the BL state?
    Jonny...
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?


    Thanks for sticking with it!

    This is with the SSB still unplugged, right?

    Taking measurements on 1M99 with main board (SSB) unplugged, and STB jumpered to ground

    12Vssb: 12.42
    GND1: 0.0
    12Vssb: 12.42
    GND1: 0.0
    Val_bo: 12.42
    GND_al_bo: 0.0
    Val_bo: 12.42
    GND_al_bo: 0.0...
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?



    Sorry, I don't understand all the questions... Is this about the nature of the panel? I honestly don't know. I'm pretty sure it's an LED backlight. I made sure to lift up the panel enough to see the front too - I think I'd see light leaking through the LCD even with the panel off?



    Yea, attached...




    Again I'm afraid I'm not sure what the question is... I was taking measurements from the PSU side of the connector, and when I added the...
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?

    ...I've also just probed P19 of the D-class amp, which I think is AUDIO-MUTEn (data sheet calls it (!PDN) (PDN, overlined, how should I denote that?) which is 'power down'.

    These readings are while the board is plugged in and powered on (the 3V3s signal is present).

    Initially: 0.49V.

    If I then add the jumper between STB and GND (IE to fire up the 12V supply)

    Pin 19 goes to 3.3V

    Not sure if this is any relevance... but there you go
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?



    Thanks for the new steps.
    Here's what I did
    * remove all power
    * disconnect main board from PSU (3 connectors, 1M54, 1M99, 1M95)
    * Jumper P2 to P3 (GND) (jumper into female socket on disconnected end of connector)
    * Test for continuity between P11 BLon and GND. --> no beep, ~90k when measured but looks dynamic (drifts down to 90K), so assuming this counts as no connection...
    --> install jumper of 220R (all I have to hand, from a Kenwood Mixer repair kit!)...
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?



    Just so I don't lead you up the garden path, I've understood this to mean "If you press the power button when the system is all plugged in as normal, does the state of the STB signal on the connector change?"

    A:
    ...not in any way I can catch with my multimeter... but holding the probes on STB and pushing the button, I see stable 3.07V on the STB pin...

    I also tried monitoring that pin while turning the machine on/off at the wall.

    Off-->On:...
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?



    Thanks, after disconnecting main board and plugging in, I get:

    [CODE]
    1M95 voltages (reference to P3, GND1) when fully disconnected from main board
    1: 3V3s : 3.3
    2: STB : 2.36
    3: GND1: GND/Ref
    4: GND1: 0.00
    5: 12Vssb: 0.00
    6: 12Vssb: 0.00
    7: Vsnd : 0.00
    8: Vsnd : 0.00
    9: GND_S: 0
    10: GND_S: 0
    11: BLon: 0
    12: BL-DIM: 0
    13: BLIC: 0.00
    14: POK: 0.00

    1M95 voltages (reference...
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  • mailforwho
    replied to Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources
    Re: Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?

    Thanks for the quick answer, sorry about the missing info.

    [B]PSU[/B]:


    [B]Main Board:
    [/B] (I took the chance to annotate what I did exactly when I said I'd shorted SDM to GND in case I messed that up)

    Detail for the pin allocation of the connector:

    [CODE]1: 3V3s : 3.3
    2: STB : 3.07
    3: GND1: GND/Ref
    4: GND1: 0
    5: 12Vssb: 0.09
    6: 12Vssb: 0.09
    7: Vsnd : 0.09
    8: Vsnd : 0.09
    9: GND_S: 0...
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  • mailforwho
    started a topic Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?
    in Troubleshooting TVs and Video Sources

    Philips 40PFL7007T/12 debug and repair. Fusion chip or PSU?

    Hello everyone,

    I've got a Philips 40PFL7007T/12 TV and it died spontaneously. Didn't go intermittent, just one day it wouldn't turn on (about a year ago, actually, but sometimes it takes a while to get around to opening things up!). This isn't really my world, so apologies if I've messed up on terminology or not provided anything important - happy to be corrected.

    Oddly, it doesn't seem to do a lot of the things other people on the forum get from their faulty Philips/TPVision TVs - notably I don't get any Blink Codes or really any sign it's alive at all. I've sat...
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  • mailforwho
    replied to New Members - please post your introductions here
    in Announcements & Related News
    Re: New Members - please post your introductions here

    Hello board, nice to meet you all... I'm a (mainly) software engineer that hates things going to waste and loves saving or transforming old (well, by today's standards) things. Most of the bad caps I've encountered thus far have been in Kenwood mixers, but there's a backlog of broken things in the house and hopefully by being part of the forum I can start to learn about the more complicated ones.
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