Philips 37PF7321/98 cannot turn on
Collapse
X
-
Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740 -
Re: Philips 37PF7321/98 cannot turn on
1st cup of coffee, I forgot a word
SO, that makes HALF the relay on a low voltage side.
or
SO, that makes the relay FEEDs on a low voltage side.
ThanksComment
-
Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: Philips 37PF7321/98 cannot turn on
we might need a picture of that board once we get an answer to see if in fact the relay clicks on and off with the white plug to it being plugged and unplugged.
It think power is getting there and the relay contacts are cookedComment
-
Re: Philips 37PF7321/98 cannot turn on
is it morning already !!
Looks like the relay might not turning on
and it is not letting the voltage go to the large bridge rectifier
before , you said it had power at both pins, but you were probably probing these two pins incorrectly (possibly at the same time ?)
since it does click, the voltage should be getting to it from the other board to 1 and 4 even though you did not get a reading the first time. (Did you unplug the small white plug while the power plug was in or did you unplug it then plug the power in)
IF you unplugged it first: try to unplug it while the power is plugged in to see if it clicks and then plug it back in while the power plug is in to see if it clicks again.
If it does not click on and off, you can try an external 5 volt source to the pins 1 and 4 of the relay(old phone adapters are around that or 4 AA batteries end for end with two wires)
FYI: IF you notice on that power board on the top side there are lines with slashes across them on the top and on the bottom there are similar in the areas that are not green.
these are separations between high voltage and low voltage areas.
SO, that makes the relay on a low voltage side.
So, if a board is loose, when you check for DC on low voltage sides, you need to use a low voltage side ground (easiest to do is usually a negative/ground pin of a capacitor)
and on high voltage sides and high voltage cap.
If the board is mounted on a metal frame, you can usually do low voltage using a frame as ground which is why they have the screw areas also marked off as low voltage side, BUT, in this case , I do not see grounding pads on the screws to allow this ?
Thanks selldoor for your warning about the relay hot side.
Ok. I power up the tv with all connectors plug in. There is a click sound. I then unplug the small white connector and waited 5 sec and plug it back in. There is no click sound.
The relay click when I use external 5vDC source.Comment
-
Re: Philips 37PF7321/98 cannot turn on
no nightmares !!
After you applied external 5 volts to make it click , did you check the voltages out of the relay like you did before with using the main fuse for black probe and red probe to 2 and 3.
and if you saw 240 voltage on the number 2 pin, did you then check the voltages at the large capacitors
If 2 still has no power then the relay is not working.
Theoretically it could be bypassed.
Does the white plug harness have 2 or 3 wires ? if it has 3, one might be a feedback to tell the standby board that is is connected.Comment
-
Re: Philips 37PF7321/98 cannot turn on
no nightmares !!
After you applied external 5 volts to make it click , did you check the voltages out of the relay like you did before with using the main fuse for black probe and red probe to 2 and 3.
and if you saw 240 voltage on the number 2 pin, did you then check the voltages at the large capacitors
If 2 still has no power then the relay is not working.
Theoretically it could be bypassed.
Does the white plug harness have 2 or 3 wires ? if it has 3, one might be a feedback to tell the standby board that is is connected.
The white plug has 3 pins.Comment
-
Re: Philips 37PF7321/98 cannot turn on
darn but good
seems the relay is not getting powered up by the standby board for some reason
so we'll need good pictures of both sides of that board
while you have it powered on with the external 5volts, check to see if you now have voltage on the two plugs at the other end of the power supply.
the two I would check would be the 4 pin and the 3 pin that are right next to each other.
It looks like he 3 pin is ground and the 4 pin has two pins of one voltage and the other two of another voltageComment
-
Re: Philips 37PF7321/98 cannot turn on
darn but good
seems the relay is not getting powered up by the standby board for some reason
so we'll need good pictures of both sides of that board
while you have it powered on with the external 5volts, check to see if you now have voltage on the two plugs at the other end of the power supply.
the two I would check would be the 4 pin and the 3 pin that are right next to each other.
It looks like he 3 pin is ground and the 4 pin has two pins of one voltage and the other two of another voltageComment
-
Re: Philips 37PF7321/98 cannot turn on
sorry I see pic just come upLast edited by selldoor; 06-15-2014, 10:44 AM.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Comment
-
Re: Philips 37PF7321/98 cannot turn on
maybe
since you are showing power as I suspected on the power supply, that should be ok
It is going to take me a bit to try to figure out where to start on this board to check for power, etcComment
-
Re: Philips 37PF7321/98 cannot turn on
Ok
this may take a while
with power supply hooked up with just the two smaller plugs that we have been dealing with from the power supply to this board connected
Let start with checking to see if the high power side of this board is putting out low power dc
check for voltage at the diode with the red circle.
You can use the jumper wire in the black circle or the negative side or the capacitor pointed to by the black arrow for the ground.
If voltage is there, let me know what it is. then check the capacitor pos side of the cap that has the black arrow.
and also check the pins at the small 4 pin connector next to the orange fuse in the yellow circle 2 reds should be + and 2 greens should be -
then--
With this board disconnected from the power supply:
switch your tester to ohms and compare resistance from the 3 pin plug that should be powering on the relay of the power board
check resistance from the blue pins to one of the black grounds and also the resistance from the red pin to groundComment
-
Re: Philips 37PF7321/98 cannot turn on
Ok
this may take a while
with power supply hooked up with just the two smaller plugs that we have been dealing with from the power supply to this board connected
Let start with checking to see if the high power side of this board is putting out low power dc
check for voltage at the diode with the red circle.
You can use the jumper wire in the black circle or the negative side or the capacitor pointed to by the black arrow for the ground.
If voltage is there, let me know what it is. then check the capacitor pos side of the cap that has the black arrow.
and also check the pins at the small 4 pin connector next to the orange fuse in the yellow circle 2 reds should be + and 2 greens should be -
then--
With this board disconnected from the power supply:
switch your tester to ohms and compare resistance from the 3 pin plug that should be powering on the relay of the power board
check resistance from the blue pins to one of the black grounds and also the resistance from the red pin to ground
I will test the resistance later. Got called for some urgent work.Comment
-
Re: Philips 37PF7321/98 cannot turn on
good
5 volts is what I was hoping for on the diode
and 0 on the small connector (I think that small connector will show voltage only when the 12 and 24 volt 4 pin connector is connected from the power supply)
next to the 5volt diode is a similar size black part at 5506
can you see any markings on it ?
I believe it is a inductor or a fuse
and it should have 5 volts at both ends. let me know on this one
one thing about these boards that sux is that they do not put a nomenclature letter in front of their numbers like R for resistor or F for fuse or C for Capacitor or L for inductor ETCComment
-
Re: Philips 37PF7321/98 cannot turn on
What I do is open the pdf then press "control" "F" enter the board designator
and press next just to make sure its the part you want on the diagrams then
keep pressing next and hopefully it is listed and for 5506 you get this:
"5506 4822 157 11411 Bead 80Ω at 100MHz"
I started to look up the larger parts that I thought might be relevant to the 5volts in the area of the connector on the standby board that goes to the
relay.
There is a mosfet at 7531
and quite afew switching transistors bc817-25w and bc847bw
Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: Philips 37PF7321/98 cannot turn on
I don't know whether I did something wrong or not.
The fuse 1007(the orange round fuse) is 17kohm when no power is plug into the board. Looks like this fuse is blown and there is 0v at cap 2018 and 2034.Last edited by john_doe; 06-16-2014, 09:31 AM.Comment
Related Topics
Collapse
-
by JorKsXHello. Got my hands on Philips 47pfl6008s/12.
Problem is that it does not turn on. Last owner said the problem came slowly.
One day did not respond to remote, had to unplug from AC and then back and it worked. next day had to disconnect 3-4 times before it turned on.
And then it went into hours of unplugging and replugging until it turned on.
When I plug AC into tv, it does not respond to "turn on" button or anything else.
After 10-15minutes the TV starts blinking red LED twice.
So it blinks twice, then waits 3 seconds, then again twice... -
by pajdekHello, i have some issues with my laptop Lenovo Y700-17ISK (motherboard BY511 NM-A541), it started when i turn on the laptop, but the lcd wont turn on, i then connected it via hdmi to tv and screen was ok. So i thought maybe lcd stripe is faulty, i removed the bottom cover, disconnected main battery, reset the cmos by disconnecting battery for 1 min, then slighty move the lcd stripe. Conncted power supply and tuned on my laptop, the lcd turn on, it started to load os, then it turn off, after a second it turn on, then after like 3 seconds turn off again, and so on. Removed power supply, waited...
-
by ovraxHello everyone,
First of all, please excuse me as I'm quite new to this field.
I have a Philips 55PUS6804/12 TV. It turns on and off instantly (backlight flash). I personally think it's a backlight issue (faulty LEDs). Could you help me confirm my diagnosis?
I've checked and the T-CON seems to be fine. I disconnected one ribbon cable at a time at the bottom, but the problem persists.
The Ambilight works perfectly and stays on.
No sounds.
Thanks in advance.5 Photos -
by RdeveLabsTo all the members here...
Let me tell you a little bit about what happened to my laptop (MSI GF63 THIN 11UCX model: MS-16R6) that “maybe” you know how to solve this problem.
So before this problem happened, my laptop was running smoothly. When I wanted to restart my laptop, it looked fine at first. But after I waited for this restart process to take a long time, until finally I panicked (because the restart process did not finish plus the laptop screen only showed a black screen), I immediately pressed and held the power button to force the laptop to turn off. But... -
by robante15Hello, I have an Acer Aspire 4520 from a couple of decades ago and I want to repair it solely for nostalgia.
It happens that when I turn it on after having been disconnected for a long time, it turns on without problems, it tells me that the BIOS has been reset and that it will load the factory settings, if I tell it to continue, the computer turns on and everything works fine.
The moment I turn it off and want to turn it back on a second time, or restart it and try to start it again, it no longer gives an image, and it no longer responds.
If I remove the... - Loading...
- No more items.
Comment