Philips 42PFL5332D/37 no backlight

[RobII]

Hello TV repair guru's!! My Philips 42" TV has an issue. There is sound and you can see a picture on the screen with a flashlight but there is no backlight. The backlight does not come on at all. I found another post with a LG TV that had the exact same issue with an inverter board from ShopJimmy that was listed as compatible with my Philips. One problem is I did not see a part number or link for that inverter board.

I did see this seems to be a common problem with LG/Philips inverter boards. Is there something I should be checking before I start replacing components?

I haven't opened the case up yet but plan on doing that this weekend.

Thanks in advance!!

[ReeceyBurger123]

Re: Philips 42PFL5332D/37 no backlight

What inverter does it use can you upload images ? If its the one im thinking of normally the caps for it fail which blows the controller Ic.

[RobII]

Re: Philips 42PFL5332D/37 no backlight

I will do that tomorrow. Thank you!!

[ReeceyBurger123]

Re: Philips 42PFL5332D/37 no backlight

No worries, let us know

[thoma]

Re: Philips 42PFL5332D/37 no backlight

http://www.ebay.de/itm/LG-Philips-In...-/141847603843

http://www.forumazur.com/en/infos/te...philips-lcd-tv

http://www.ohmsupplies.co.uk/epages/...Products/KIT63

[RobII]

Re: Philips 42PFL5332D/37 no backlight

Removed the back cover. SSB looks good but a bit dusty. Removed the covers for the master and slave inverters and yeah, caps on both are popped.

@thoma, I looked at the links you provided specifically the second one. I did not see any damage to any of the components other than the caps.

@ReeceyBurger123, Pics are attached. At the very least I am going to replace the caps since they are cheap. What's the worst that could happen, I'm left with where I started?

There is also a suspect cap on the SSB near the inverter outputs. Attached as well.

Any other suggestions before I tear into it?

Thanks again for the assistance!!!

[RobII]

Re: Philips 42PFL5332D/37 no backlight

Another quick update. Fuse MF1 is open on the master inverter. I checked the MOSFETS and none are showing a short or open.

Does anyone have a link to the schematics or the part number for fuse MF1?

[budm]

Re: Philips 42PFL5332D/37 no backlight

'10A' as printed on the body as sen on the pictures, made by LittleFuse.

[RobII]

Re: Philips 42PFL5332D/37 no backlight

These?

http://www.mouser.com/ProductDetail/...3lRveogD6i8%3d

'10A' as printed on the body as sen on the pictures, made by LittleFuse.

[budm]

Re: Philips 42PFL5332D/37 no backlight

It looks like it. But are you sure there is no short on the board? The two caps showing low ESR and capacitance?

[RobII]

Re: Philips 42PFL5332D/37 no backlight

So far I have found no short. I checked the MOSFET's on both inverter boards (in circuit) and there is no shorts between gate and drain on any of them.

Edit: The two caps on both boards are shot. Domed and leaking.

It looks like it. But are you sure there is no short on the board? The two caps showing low ESR and capacitance?

[budm]

Re: Philips 42PFL5332D/37 no backlight

So far I have found no short. I checked the MOSFET's on both inverter boards (in circuit) and there is no shorts between gate and drain on any of them.

Edit: The two caps on both boards are shot. Domed and leaking.

Sam for Source and Drain too, no short?
Bad caps can cause the circuit to draws lots of current due to high ripple voltage and also cause switching frequency to run at the wrong frequency.

[tvtimmy]

Re: Philips 42PFL5332D/37 no backlight

Change the bad caps and the fuse. I fixed one this way. Still going.................................

[RobII]

Re: Philips 42PFL5332D/37 no backlight

Double checked and correct, no shorts.

Pics of components removed.

Sam for Source and Drain too, no short?
Bad caps can cause the circuit to draws lots of current due to high ripple voltage and also cause switching frequency to run at the wrong frequency.

[RobII]

Re: Philips 42PFL5332D/37 no backlight

Another quick update and question. I removed a couple of suspect caps from the power supply board. One looks like it exploded out the bottom.

My question, right next to the suspect caps are L203 and L204. I can't quite figure out what they are. Both tested short but since I have no idea what they are.... Any clue? Pic's attached

[thoma]

Re: Philips 42PFL5332D/37 no backlight

https://cdn.badcaps-static.com/pdfs/...39dfa5950e.pdf

WAIT UNTIL GET MANUAL APPEARS!!!!!!

regards thoma!

[RobII]

Re: Philips 42PFL5332D/37 no backlight

After talking to one of the techs where I work, they informed me that the mystery components are inductors.

I have placed a Mouser order so now the waiting game.

Thanks for all the help so far. I'll update when I get the parts.

[budm]

Re: Philips 42PFL5332D/37 no backlight

https://www.badcaps.net/forum/attach...7&d=1459694689
The cap under the heatsink should be replaced also, you can see bare aluminum, looks like it got hot too.

[RobII]

Re: Philips 42PFL5332D/37 no backlight

I was debating on whether to replace it or not. Visually it looked ok but I should have checked it a little more thoroughly.

Thank you sir!!

[budm]

Re: Philips 42PFL5332D/37 no backlight

That caps under the heatsink look to be part of the PI filter to work in conjunction with those two small caps that have blown bottom, so more likely that the small caps had to do all the works due to bad caps under that heatsink..