Re: Philips 42pfl5432d backlight
yes im in usa
cap is:
Peloa 220uf 450v
tested 203uf on dmm
yes im in usa
cap is:
Peloa 220uf 450v
tested 203uf on dmm
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Last edited by ryan74; 11-21-2012, 12:51 PM. -
Re: Philips 42pfl5432d backlight
Did you check the startup cap? It's different to the main cap.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Philips 42pfl5432d backlight
not sure which one that is but all caps(except the big one) were replaced when i started working on this.Last edited by ryan74; 11-21-2012, 02:24 PM.Comment
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Re: Philips 42pfl5432d backlight
I think the 325vdc on the cap is too low.
See the sch of the power supply.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 42pfl5432d backlight
ill do my best. i have some trouble with schematics. i understand about 25% of what i see but i also get lost sometimes trying to trace or find things. not to mention theres still alot of components i dont know like sg(donut shaped with copper winding).Comment
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Re: Philips 42pfl5432d backlight
schematic didnt help too much but it looked like the problem could be around BD901 or ic902
im about to give up on this tv and junk it just because i have over 6 hrs of reading and looking at schematics invested (and 1 headache) it hasnt helped because i have such a limited understanding of component lvl repair. everything i read leads me to bad caps or diods(fets). im not paying over $100 for a replacement power supply.
At this point i would consider sending it out for repair if anyone is interested.
Are the parts circled capacitors? do these test any different?
I want to check BD901(one of a few i havent tested yet) but it has 4pins and 2 are marked +-. im not sure if i test the usual way with black probe on pin1 then red on 2-3-4 and report all readings then continue with black probe on pin2, red on p1,3,4 and so on.Attached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by ryan74; 11-25-2012, 03:08 PM.Comment
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Re: Philips 42pfl5432d backlight
Not sure about the caps - dont think you can test except perhaps for being short or open
The BD is the bridge rectifier if that was not working you would get no voltage on the big cap. Here is one way of testing
Pins 0 0 0 0
..... 1 2 3 4
Mains power OFF
Set your meter to measure 2000 ohms.
Place positive (red) probe on the + pin. 1 above
Place negative (black) probe on the ac pin 2 above.
Write down the result. ohms
Place positive (red) probe on the ac pin. 2 above
Place negative (black) probe on the + pin 1 above.
Write down the result ohms
Place positive (red) probe on the ac pin. 2 above
Place negative (black) probe on the ac pin 3 above.
Write down the result ohms
Place positive (red) probe on the ac pin. 3 above
Place negative (black) probe on the ac pin 2 above.
Write down the result ohms
Place positive (red) probe on the ac pin. 3 above
Place negative (black) probe on the - pin 4 above.
Write down the result ohms
Place positive (red) probe on the - pin. 4 above
Place negative (black) probe on the ac pin 3 above.
Write down the result. ohms
You can cut and past the above and write in your results
It is like a double diodeLast edited by selldoor; 11-25-2012, 03:08 PM.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 42pfl5432d backlight
i think my meter only has autorange
Pins 0 0 0 0
..... 1 2 3 4
Mains power OFF
Set your meter to measure 2000 ohms.
Place positive (red) probe on the + pin. 1 above
Place negative (black) probe on the ac pin 2 above.
Write down the result. ohms = 3.75mohm
Place positive (red) probe on the ac pin. 2 above
Place negative (black) probe on the + pin 1 above.
Write down the result ohms = .0L
Place positive (red) probe on the ac pin. 2 above
Place negative (black) probe on the ac pin 3 above.
Write down the result ohms = 37.21mohm
Place positive (red) probe on the ac pin. 3 above
Place negative (black) probe on the ac pin 2 above.
Write down the result ohms = 35.72mohm
Place positive (red) probe on the ac pin. 3 above
Place negative (black) probe on the - pin 4 above.
Write down the result ohms = 0.746mohm
Place positive (red) probe on the - pin. 4 above
Place negative (black) probe on the ac pin 3 above.
Write down the result. ohms = 37.52mohm
testing the same pins in diode mode i got:
p1-2 =.496
p2-1 = .0L
p2-3 = .0L
p3-2 = .0L
p3-4 = .477
p4-3 = .0LComment
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Re: Philips 42pfl5432d backlight
Yes it is okPlease 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 42pfl5432d backlight
at this point im lost.
no idea what to look at now.
i havent located the big cap on schematics, i must be blind...lolAttached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by ryan74; 11-25-2012, 04:36 PM.Comment
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Re: Philips 42pfl5432d backlight
D901
STTH8L06FP
GK2E9 VU
CHN 725
black probe on p1
p1-2 = 6.95mohms
black probe on p2
p2-1 = 0.L
i also tested in diode mode
p1-2 = 0.439v
p2-1 = .0L
im not sure how to test FB903, FB904, FB905
they look like diodes but no grey line
also theres resistors R969,R970,R971 on the bottom of board.
should i test these and how
i read ic902 on the back could cause problems but not sure how to test it either.Attached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by ryan74; 11-25-2012, 06:48 PM.Comment
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Re: Philips 42pfl5432d backlight
If I can't figure it out this week I may have to send it here.
I can't find anything cheaper.
http://www.tvparts4less.com/philips-...e-service.htmlComment
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Re: Philips 42pfl5432d backlight
FBxxx are ferrite beads you jsut need to test for continuity
Resistors - you check on ohms - need to lift one end for accuracy /continuity
I dont know how to test IC - if you get the part number off it you might find a datasheet which would helpPlease 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 42pfl5432d backlight
I think I fixed it. Backlights turn on now.
I Think someone attempted to repair it before.
I found a bad trace on bottom of board after I went and bought a magnifying lamp.
After repairing it the backlights stay on.
I'm sooo happy I don't have to send it out.
Thanks for the help. At least I learned something.Comment
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Re: Philips 42pfl5432d backlight
Great job!
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Philips 42pfl5432d backlight
Well done! - I usually spot that sort of thing but as you never posted pictures of the bottom sides it would be kind of difficult to see
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 42pfl5432d backlight
I just got offered to buy this same model tv today but i got 3 sets in my shop now that I am working on plus I'm running low on cash till I sell one. LOL Good job!!!The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS
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Re: Philips 42pfl5432d backlight
Well, I just picked up the set today. I hope it's the usual suspects. The guy had this for years and he just now had the problem.The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS
Comment
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Re: Philips 42pfl5432d backlight
I never believe people who say that.The guy had this for years and he just now had the problem.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Philips 42pfl5432d backlight
All I did so far is plug it in to see what it does and it doesn't even show any difference between plugged in and not plugged in. Like I said before, I'm expecting this to be the usual four blown caps and maybe a diode or two. I won't get into this one till Saturday.The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS
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So i'm trying to replace the LED's in a Philips TV. It's 42" with a 715g7262-p01-000-0010 backlight driver board based around an O2 Micro OZ9902CGN.
My issue is when I replace all the LED's on one board with the new 3V 300ma ones they immediately burn out when the set is powered again. I previously tried the same thing with 6V LED's and the backlight flickered for a bit but wouldn't start.
The original LED's which I removed which are still working start to melt and burn when given more than 3V on DCPS so I know they shouldn't be higher voltage ones.
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I raised the question of whether PWM on the power board "dim" pin would be a reasonable assumption for controlling the backlight of a Philips TV (55put6101/12): https://www.badcaps.net/forum/troubl...d-tv-backlight. I didn't receive any insights there so I went ahead and tried it.
The setup is basically:
Rpi3 hardware PWM → 220 Ohm → NPN transistor → dim pin
Transistor is switching the 3.5 V supply on the power board.... -
Hello,
I'd like to repair a Philips 55PUS6704.
It turns on and you can see the backlight, hear the sound but no picture.
When I disconnect one of the T-con cables, half of the screen turns white.
right cable disconnected= right side white
left cable disconnected= left side white
When I tape like 6 or 7 pins of one cable it looks like the picture attached. I already tried another T-con board without success.
There are no shorts on the the mainbaord and the two lcd panel boards...at leat I couldn't find any.
Also you can notice one single... -
Hello 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. -
this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
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