philips 42pfl5432d/37 no power-blows fuse on PSU

[philliesfan30m]

i've been coming to this site for over a month in hopes of troubleshooting this problem but my problem seems different than all the others i have viewed with the same tv they have different problems. my tv was shut off a month or so ago and it wouldn't turn back on no standby light nothing. i unplugged it for a few hours and still nothing then i took the back off and no buldging caps and i read the common cause according to the basic guide is shorted out diodes or transistors. but i am new to this so i don't know how to go about narrowing it down to what i need to fix. board # 715T2432-3 and you can't buy a new 1 cause they are all sold out wherever i checked! they are capXon capacitors which i hear aren't good but they don't have any visual problems even though that doesn't mean anything! i have a digital multimeter but it isn't a good 1. thanks in advance for anyone that helps out any help is better than no help. the board is currently out of the tv with no fuse in it but i have 1 extras to put in it but they aren't ceramic because i was waiting until i got the problem diagnosed first.

[audiofreak19]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

Try plugging the power supply back in and trying it again cause I have the same tv and it had the same problem. I de soldered a cap to have it checked out cause I thought it was slightly buldged but ended up being fine. When I put it back in I tried powering the tv on and it fired right up.

[notallbad]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

You could use your DMM to check for any shorts or open ctts, i.e resistors for opens, caps for shorts though its most likely a short cct your looking for.

[budm]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

Any pictures of the boards and the TV?

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

i did put the power supply back in that is when it immediately blew a fuse so i am thinking it is a short but i don't know where to start i checked the 4 bigger caps the 3 bigger 1500-35v and the 1 a little smaller 2200-16v and they seem to be charging and discharging but i did read a lot of forums on here and that doesn't mean anything unless u have a esr meter and i don't have 1 nor do i have the money right now for it maybe in the future. thanks for replying people i am just a newbie to this. sorry budm i don't have any pics now and sorry for not replying sooner i was working. i don't know what resistors to check or should i just check them all on the psb? there are pics on here that show the same exact board budm. i'm just not sure i am checking things with the dmm correctly. if i find the same boards should i post them or did u want to see my board specifically budm?

[tom66]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

If you don't have an ESR meter, I'd just swap those caps anyway they're less than a dollar each usually.

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

ok tom66 i'll give it a shot and post back when done i don't have the caps any preferences as to brand? i have read a lot of your replies and you seems to know your stuff! thanks for the response

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

panasonic?

[vinceroger69]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

may also be worth checking the items found faulty on this psu if the same as your in post 1
https://www.badcaps.net/forum/showth...2pfl5432d%2F37

panasonic fm fr fc is what i use in psu

[budm]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

Pictures of your board, since you may not have seen something on your board that may look normal to you but not to us.

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

ok thanks vince. i used my dmm and put it on diode test for d912 and it read 0 both ways now does that mean it is bad? shouldn't it read open 1 way and millivolts the other way? i have a cheap centech dmm i really would like someone to help me find out if i am reading resistors and diodes properly. i also checked q901 and q902 they are 3 pin resistors and those pics on the other thread are my exact board. i thought i was doing it right but now i'm getting confused...thanks for the reply vince

[vinceroger69]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

i am still learning my self but when a diode reads both ways like that i desolder 1 lead from the board and lift it up so not making contact with the psu and recheck there are a few diodes on your board so if you can take a good picture as budm suggests it will help point the parts out to check can you read the part numbers from the mosfets? on the heat sink maybe budm or tom or someone more experienced than me will advise you how to test these correctly.maybe worth checking the TEA1507P as well.

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

bud i took some pics of my board but they aren't the best quality. i will take pics of all the boards if needed but now i only have a few of the psb. thanks for replying and i also added the ps data sheet with the schematics if that helps at all. i hope i uploaded them correctly!

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

can someone please help me to find out if i am testing q901 and q902 the proper way and what the readings should be i think they might be shorted but don't know if i am checking it right

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

q is a transistor i think and it has 3 pins but i am getting all kinds of wacky reading from my dmm and is it able to be checked while in circuit? i have it in ohms and tested pin 1 to 2 then reversed pos and neg then did the same between 2 and 3.

[vinceroger69]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

can you get the part numbers from q901 and q902 then we can look for data sheets for them and see what they are any odd readings i do remove from the circuit to test just remember which one comes from which location i would download your pdf but i am on a payg dongle for internet at the minute and not much data left on it.also check Zener Diodes (ZD902 & ZD904) if they on your board should only get a reading in one direction if good test on diode mode.

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

q901 is STW18NK80Z_06 N-channel 800V - 0.34Ω - 19A - TO-247 Zener-protected SuperMESH™ Power MOSFET and q902 is W26NM60 Datasheet (PDF) - STMicroelectronics - N-CHANNEL 600V - 0.125ohm - 26A TO-247 Zener-Protected MDmesh TM Power MOSFET

[vinceroger69]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

try this http://n0m1.com/2011/12/04/how-to-te...hannel-mosfet/

[philliesfan30m]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

i tried that and i am still not getting the same results as they do it thanks for trying i must be a complete idiot i don't understand how they are reading

[vinceroger69]

Re: philips 42pfl5432d/37 no power-blows fuse on PSU

hopefully tom or budm or someone whos tested these before may be on soon and may know a easier test have you removed them from the board?