Re: Phillips 50PF7220A/37B - seven red flashing lights.
Those are numbered Q8001 and Q8003. The component at Q8001, again cleverly hidden under a heatsink, is numbered DE3523 which Google tells me is a Power MOSFET. How should I test it? Remember I'm new to this so I would appreciate the "idiots" guide.
Thanks....
Spock
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Last Activity: 09-26-2012, 05:32 PM
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
Whilst I'm no expert, I can't see any physical damage so I suspect it's flux residue as I can see other components with similar but smaller marks. Most of the marks will rub off with an alcohol swab....Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
Am glad to do so if you could be so kind as to point out their location and description, thanks....Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
1-2 .428 v
1-3 .428 v
1-4 .747 v
2-3 OL
2-4 .410 v
3-4 .408 v
Nothing between pins 2 & 3....Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
Thanks to a good application of Chip-Quik I have managed to remove the heatsink and bridge rectifier (picture below). Retested with results below:-
1-2 .66 Ω
1-3 18.0 Ω
1-4 20.0 Ω
2-3 12.6 Ω
2-4 13.0 Ω
3-4 13.7 Ω
A little different from the readings I got when the component was soldered to the board but more importantly, now what?...Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
I have 2 irons, a 30W and a 45W Radio Shack desoldering iron (see below). The 45W will melt the solder a little so I'll look for some Chip-Quik. Thanks....Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
Pictures as requested:-
Pic # 010 is the clip showing the side sliding into slots on the large heatsinks.
Pic # 011 Shows both large and small heatsink. The dark shadow between them is the bridge rectifier.
Pic # 012 Is the underside of the PCB with the legs of clip....Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
[B]Desoldering help needed.[/B] The bridge rectifier I'm trying to desolder is sandwiched between two aluminum heatsinks. The smaller heatsink is screwed to the larger one with the bridge rectifier between them. The large heatsink is attached to a pair of two legged clips that slide into it and the clips are soldered to the board.
I've desoldered the bridge rectifier but I cant move it until I desolder the heatsink clips. When I try and desolder the clips, the heatsink is doing its job too well and I'm having...Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
Thanks, that's the one as far as I can tell without desoldering it.
Counting the pins from nearest to the power inlet I get.
1-2 .666 Ω
1-3 1.3 Ω
1-4 .681 Ω
2-3 105 Ω
2-4 .845 Ω
3-4 49.3 Ω
When I take the readings they are tending to rise very slowly by a hundredth of an ohm, is that normal. I'm using a Craftsman Digital Meter 82369.
Sorry for the...Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
The component you circled is at D8006 on the circuit board and is sandwiched between a large and small heatsink. I'll see if I can find a link to a service manual with a circuit diagram.
I'm going to do the testing tomorrow when there might be a little less distraction.
Thanks so far....Leave a comment:
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
Thanks. I read the FAQ's and downsized the image only to realize that I could have left it a lot larger.
I hope this revised one helps but if you need an enlargement of a particular portion of the board let me know.
Forgot the five hour time difference to Doughnut City, sorry.
...
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Re: Phillips 50PF7220A/37B - seven red flashing lights.
I have removed the power board and can post a picture of the underside. Know of any source for new boards in the event this one is beyond repair?
Thanks for taking the time to respond on Christmas Eve....Leave a comment:
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Phillips 50PF7220A/37B - seven red flashing lights.
My 50" plasma, a Phillips 50PF7220A/37B, has the seven red flashing lights.
I bought this as a factory refurb 5 years ago and had no problems up to 18 months ago when I lost picture and sound, I don't remember if I got a constant or red flashing light but I opened up the back, checked the fuse next to the power input, it had blown and replaced it. It worked again.
Couple of days ago it stopped working mid session. Red flashing light so I unplugged the power, left it for 30 minutes or so and more in hope than expectation I plugged it back in and it worked. Woo... -
Re: New Members - please post your introductions here
Hi, happy christmas everyone.Leave a comment:
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