Philips 37PF7321/98 cannot turn on
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Re: Philips 37PF7321/98 cannot turn on
What is happening???
I jump a ground to Gate and now the Gate is 20v and Yellow S(source) is 5v.
And the pin 3 of 1305 is 0v.
When I power off and on the tv, the led light on the front panel is green and stay green. Before this, the led is green and after about 2 sec will turn red.
Now when I power up the tv, the front panel LED light is off. I press the power button and the LED turned green. The tv screen also lighted up! I swear I didn't do anything.
Am I seeing things? I better go and sleep.Comment
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Re: Philips 37PF7321/98 cannot turn on
Great stuff - hope it lasts - I dont know if its possible to unstick a stuck transistor- maybe?
If it doesnt come on again try heating that section of the board with a hairdryer maybe
getting some voltage through heated something up making it work.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Philips 37PF7321/98 cannot turn on
Darn, 143 posts and the TV start functioning by itself.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Philips 37PF7321/98 cannot turn on
looks like we found part of the issue
now if you do that with the 3 pin wire connected to the power supply, the relay might just kick onComment
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Re: Philips 37PF7321/98 cannot turn on
When I power up the TV, no front panel LED light. Press the power on button and the LED light turn green and stay green. Screen on TV also lighted up.Comment
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Re: Philips 37PF7321/98 cannot turn on
so that 20-20 and 5 are still at the transistor even when you power it off with the power button ?
To me that 20volts does not sound right
Also do you hear the relay click off when powering it off ?Comment
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Re: Philips 37PF7321/98 cannot turn on
When I press the power on button, green LED turn on. 20v and 5v still on.
Did not hear the relay click when pressing the power on button on and off. Only hear relay click when turn off main power.Comment
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Re: Philips 37PF7321/98 cannot turn on
unplug the 11 pin wire on the standby board, then remove the number 7 wire from the plug
(you have to slightly lift the clip on the side of the plug with a pointy object and pull the wire out)
then power up
now check the voltages on the board that we were checking at the transistor and 1305
and do a separate check on the wire and the pin that we just removedComment
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Re: Philips 37PF7321/98 cannot turn on
unplug the 11 pin wire on the standby board, then remove the number 7 wire from the plug
(you have to slightly lift the clip on the side of the plug with a pointy object and pull the wire out)
then power up
now check the voltages on the board that we were checking at the transistor and 1305
and do a separate check on the wire and the pin that we just removed
11 pin wire:
Pin 4 is 12v
Pin 5 is 5v
Pin 7 is 5v
Pin 9 is 12v
Others are 0vLast edited by john_doe; 06-20-2014, 08:34 PM.Comment
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Re: Philips 37PF7321/98 cannot turn on
ok
with all power off and with it sit to discharge a bit
check resistance in both directions from the Drain (yellowD) to the Gate pin (Yellow G)
if zero or close to it, the transistor went bad
going to need to cut a trace to isolate the Gate pin on that mosfet
use an exacto knife or the like and cut out the yellow section at the end of the pink arrow
I am trying to see if the gate is causing the 20 volts or the board itself
Picture attached if I remember this timeComment
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Re: Philips 37PF7321/98 cannot turn on
ok
with all power off and with it sit to discharge a bit
check resistance in both directions from the Drain (yellowD) to the Gate pin (Yellow G)
if zero or close to it, the transistor went bad
going to need to cut a trace to isolate the Gate pin on that mosfet
use an exacto knife or the like and cut out the yellow section at the end of the pink arrow
I am trying to see if the gate is causing the 20 volts or the board itself
Picture attached if I remember this time
7531 is new. Is it really necessary to cut trace? I have never done this.Comment
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Re: Philips 37PF7321/98 cannot turn on
7531 is new ???
when did this get changed ???
yes, you have to cut it since there are no jumpers to remove.
it's an easy redoComment
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Re: Philips 37PF7321/98 cannot turn on
Ok, trace is cut.Comment
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Re: Philips 37PF7321/98 cannot turn on
now recheck usual voltages at G D S and at 1305 and also check the pad to the right of the cutComment
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