Philips 55pos9002 TV doesn’t turn on, no led, no nothing
So when I measure input power to power board I get 220v I get 12v to the main board but tv doesnt turn on and no standby led/light??
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No standby LED is usually due to a main board problem if the power board standby voltage is OK.
Here's the service manual.
Go to p.37 Sect. 8-2-1 AC Input and check the power circuit is OK (see p.38 & p.39 as well)
Hopefully this is of some help.
Update (12/13/23)
So all the components circled aren't there??
If so then the schematic doesn't match the board
(click on image)
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This is golden! Thank you! Refresh my memory though where do I measure the SB voltage? 🙃
I think it might be the 3.5V on pin 1 of CN9101 see p.39.
Shouldn't it be on p.47? I'm not sure where to measure though. Thank you in advance for helping :)
My mistake, I just saw 55" and not the rest i.e. not 9002 ;-(
I don't know Philips all that well but was wondering if it is the ACD lead on pin16 CN9101 (also on pin1 of CN9103 (but it shows "not connected" so maybe it is a test connector point).
In other makes of TV ACD means "AC Detect" but maybe not Philips. I don't know.
I also don't know what its voltage value would be but it shouldn't be >12V I think
Okay I’ll try a few different things. If it is the main board do you have any suggestions what to look for there? Again thank you
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If i measire between C9912-C9913 I have 230V AC but between D9901-D9902 I habe 0V
Looks like it might be an updated board or at least a slightly different one.
The manual shows it as an A 715G 8886.
Is this number printed on the board or something else?
it's bad enough that the Standby circuit has been deleted from the diagram but if it is a different board then this makes it very difficult.
With regards to the board I would go with the mainboard first given that the other voltages seem to be OK and also that there appears to be no obvious problems with the components on the power board i.e. no burnt out or heat stressed components or board damage
Maybe try to source a board from suppliers who accept returns for only a small restocking fee so as to minimize the cost to you if it isn't the problem and it is something else.
It is 715G8886 I’ll try to order a mainnoard and then I’ll see. Thank you for the help and I’ll @ you if I have further questions 😁
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@jayeff
Hi I fixed the phiips tv but now im on a sony. Do you know what ”SOC Muffin problem” is??
由 Ambjörn Eriksson 完成的
@ambjoerner60296
I don't know.
SOC can mean system on a chip so maybe the Sony SOC is code named "Muffin".
Makes some sort of sense to have a "computer" run a TV especially if it has Android as an OS as some have these days.
What is the model number of the TV?
由 jayeff 完成的
@jayeff
Its a sony 55x8505c
由 Ambjörn Eriksson 完成的
@ambjoerner60296
According to the service manual there are 2 SOC chips in the TV - see p.178
A lot of the troubleshooting flowcharts point to the "muffin" soc IC1000
So once you determine which SOC is IC1000 then try changing the board that it is on as you won't be able to change the IC
由 jayeff 完成的