Philips 32PFL5604H/12 - does not light up the LED does not light up completely

power supply board (PLHL-T808A (LIPS32 FHD))


Hi, I am with this TV completely off, the client tells me that before accedesse no longer had to turn several times before it stays on until it is turned on the LED even more ....

how could do, except that no voltage is detected on the capacitor C607 100uF 400v which is of 320V, controlled all the electrolytic capacitors on the secondary without finding anything abnormal, also controlled D301 SB140 and PC101, PC102 and PC501 signed PC17L, unfortunately I can find the schematic of the board power / inverter signed PLHL-T808A (LIPS32 FHD) ....

Symptom
TV set cannot power up or has no backlight.
Cure
Replace PSU/IPB to a higher version number (MPR0.2) that is produced from week 009.3 onwards (see figure 1 for the production week code).

The 12NC order codes are as given below (#):
272217190103 (32 PLHL-T807A-MPR0.2)
- 32PFL5404H/12_1 (*)
- 32PFL3904H/12_1

272217190104 (32 PLHL-T808A-MPR0.2)
Note: for this PSU, please first refer to (attached) SCC_86941 "TV set cannot power up/start-up", to check transformer T701.
- 32PFL5604H/12_2
- 32PFL5604H/12_4
- 32PFL5624H/12_2
- 32PFL5624H/12_4

It is a solution for you
Regards

Thank you for having responded to me, unfortunately I can not download your attachment, as I have no points.

from measurements on the transformer T701, detached from the board, I have on the primary 0 ohms, while the secondary windings have in a 112 ohm and 113 ohm on the other, so I assume that the transformer T701 is working ...

OK, your T701 works fine .
But you did not say about a voltages on the connectors CN4,CN5 .
Have you some voltages on the secondary part of the PSU ?

Connectors CN 14, CN 15 I have no tensions, if possible I need the schematic or can you tell me the values of these resistors ... R101, R104, R526, R613. thanks

Service manual for this TV you can find on this portal . But w/o a diagram of the PSU .

I need to have the corresponding values of these resistors R101, R104, R526, R613. thanks

I need to have the corresponding values of these resistors R101, R104, R526, R613. thanks

Felix10 wrote:

I need to have the corresponding values of these resistors R101, R104, R526, R613. thanks

Hi,

Maybe too late but I've measured on mine the following values:
R101: 120kΩ
R104: 200kΩ
R526: 100Ω
R613: 0.39Ω

Do you have repaired or replaced your board?

thanks for letting me answer, I replaced the card (), but I intend to repair the faulty one, unfortunately I could not do the tests, because the customer was in a hurry to take the tv ..., FSQ510, I think it's bad, just i replace it, see how it goes .... the resistance values are OK, thanks

It would have been better to have the wiring diagram ...

Glad to contribute.
I've started another thread for a similar problem because I wouldn't hijack yours.

With diagram of T808A it should maybe easier to trace the problem but this LG board seems to be a "classified" one.

Anyway I've located in Spain the T701 for 35€ and the T808A for 70€. Far less then in my country. I think I'll go for the T701 and see what happens, the TV set being just over 5 years old. Extended 5 years warranty just expired .

Aldo10 wrote:

Glad to contribute.
I've started another thread for a similar problem because I wouldn't hijack yours.

With diagram of T808A it should maybe easier to trace the problem but this LG board seems to be a "classified" one.

Anyway I've located in Spain the T701 for 35€ and the T808A for 70€. Far less then in my country. I think I'll go for the T701 and see what happens, the TV set being just over 5 years old. Extended 5 years warranty just expired .

let me know the resistance values of the windings of the T701 when you arrive, thanks, though, from what you say your T701 looks good, if you have no other problems tab, check the lamps ccfl ....

P.S.
you've tried to eliminate the protection of OZ9966 ....

I take this opportunity to get to you and all the best forum Happy New Year 2105

Felix10 wrote:

let me know the resistance values of the windings of the T701 when you arrive, thanks, though, from what you say your T701 looks good, if you have no other problems tab, check the lamps ccfl ....

P.S.
you've tried to eliminate the protection of OZ9966 ....

I take this opportunity to get to you and all the best forum Happy New Year 2105

Retired technician but I'm still a beginner with LCD TV.

Will one defective CCFL shut down the whole screen? Protection?
What is and how to disable the OZ9966 protection?

Strange behaviour about T701 is that over time (3 days out from board now) one secondary winding stays stable around 114Ω but the other is slowly drifting 148Ω, 156Ω, 159Ω now.

T701 ordered. should take 2~3 weeks to come in.
Will keep you informed of future investigations.

Happy new year to u too.

protection zn9966 excluding connecting pin 15 with a resistance to ground 10KOhm

Thanks for diagram pointing the resistor to be added. Will certainly give a try if replacing T701 don't cure the problem.

One secondary of T701 is still creeping it's resistance over days. From 148Ω it is now at 175Ω so something wrong inside. The other secondary staying stable.

Will do measurements on new T701 which should be home next week.

Hi,

So the T701 has arrived faster than expected . Happy to say you that the TV set is now working and burned in for ~2 hours without problem.

I would like to share what I did prior the replacement just in case it can help other members.

1) Measuring static coil resistances of new T701 with the DVM.
Primary: as low as my test leads.
Secondaries: 109.8Ω and 109.5Ω.

2) Checking waveform of new T701 the same way I did on my other post https://www.elektroda.pl/rtvforum/topic2958186.html#14275442 .
Great difference! Output levels equals and in phase sine or square input signal. See pics.


In the meantime I watched for my T701 I did some coil measurements and the suspect winding was still creeping ending with 185.1Ω


Once again thanks for your help. Much appreciated.

I'll try to close my first post as "solved" with a link at this one.
Should I break forum rules this way pls correct.

Hello,
I had also the same problem. I checked all the things explain in the previous replies without any success. My transformer was OK
Finally I had some smoke between C452 and C453.
They were touching each other.
I move them to get a few millimetre of distance in between.
There was some black colour instead of blue .
But after that my TV work without any problems.(several days OK)
I check all the capacitor spare to have some space in between .
I don't have schematics so I suppose some high frequency, or high voltage, or other ... , which needs this space between capacitors pairs.

Hi,

Since those two capacitors clearly arced, I would change them asap. Maybe you have had poor mating contacts between some CN2-x and CCFL terminals and power supply entered protection mode??

Those ballast capacitors seems to be essential to control CCFL current intensity.
http://www.digikey.com/Web%20Export/Supplier%...ics_513/PDF/Coiltronics_4035.pdf?redirected=1

Hope it helps,

Thanks for your reply.
I just install two new capa.
Thr TV continue to run correctly.

Hello,

I have a little bit different problem..
My PSU is starting the 24V and 12V supply randomly, without command on optocoupler PC 102, making scary noises in the night in my bedroom.I think that problem comes from FAN 7530, ordered one. I had another PSU with bad T701, exchanged with good one on my PSU, now TV work fine. But I want to repair also the original one...

is anybody able to tell me, where to buy this T701?
No luck on the Google so far.....

regards

Hello Torentino,
I have a PLHL-T808A card that I can sell you to recover the transformer T701.
I live in France

@+

Hello yack33,

thank you for your offer, I have allready found the transformer in one old PSU.
About my problem with PSU, the problem lied in optocoupler PC102. Was switching randomly without command on led side.

regards

Hi, I even have a philips which starts up well but no image the backlight works well help me east problem on the tuner card on the t-con side