Philips 32PFL3403d/27 LCD NO POWER

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

Ok now, with all output cables disconnected & AC cable connected, 10 pin to GND is 0 as well as 3 and 8. So I connected my 3VDC battery power supply to the 10 and GND. I measured 0V from 3-gnd and 0 from 8 -gnd with the AC power supply connected. (not the 24 &12).

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

Thank you TechFab.

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

Ok now, with all output cables disconnected & AC cable connected, 10 pin to GND is 0 as well as 3 and 8. So I connected my 3VDC battery power supply to the 10 and GND. I measured 0V from 3-gnd and 0 from 8 -gnd with the AC power supply connected. (not the 24 &12).

And THAT seems to indicate you have a bad power supply!!! We're going to need a picture of the top, and another of the bottom, if you would.

PlainBill

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

I have some and I will try to get better ones too.

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

I have some and I will try to get better ones too.

That would be a big help.

PlainBill

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

Here are some better pictures to work with, let me know if these will do.

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

Here are some better pictures to work with, let me know if these will do.

The contrast on the back side is pretty poor; unfortunately I'm not enough of a photographer to have a clue as to how to improve it. I wouldn't worry about it at this time.

Still, I was able to do a little tracing. IC901, the 7 pin IC, is the main SMPS controller. What is the part number on that?

PlainBill

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

The service manual says NCP1337DR2G. I'll see if I can get a number from the part on the board tonight.

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

The service manual says NCP1337DR2G. I'll see if I can get a number from the part on the board tonight.

OK, pin 4 is Gnd, pin 6 is Vcc. CAREFULLY measure the voltage on pin 6 of IC901, using pin 4 as the Ground point.

PlainBill

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

Well, that was fun. I got 0.36 to 0.40 vdc. I identified the pins using the schematic in the user manual, pin 7 is skipped...

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

Well, that was fun. I got 0.36 to 0.40 vdc. I identified the pins using the schematic in the user manual, pin 7 is skipped...

My bad. Now try it with the 3V supply hooked up, - to Gnd, + to pin 10.

If you still get the same reading it will be time to do some serious tracing.

PlainBill

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

Now I get 8.0 V.

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

Now I get 8.0 V.

Bingo!!! The SMPS controller won't start until pin 6 reaches 12 volts. Now there is a problem.

If this were a single power supply, I would say that indicates a problem with the SMPS controller, and suggest you replace it. Even in this case, I would make that suggestion. Unfortunately, Neither mouser nor DigiKey stock it, and the minimum order is over 1000 parts. Someone is selling the DIP version on eBay, but that would require more than a little work to fit it in place.

So lets go to plan 'B'. Which is a Bear. I've been busy with Paint, and have several test points for your attention. First, on the standby SMPS controller is a DIP on the top of the board. On the bottom, pin 4 is marked with black while pin 6 is marked with red. What is the voltage across those two points? Next, the outputs of the optoisolators have been circled in orange. One of those should change voltage when the 3 volt supply is hooked up. Which one does? Lastly, an area of the board has very crudely been outlined in yellow. I would like a detailed (larger!!!) picture of that area.

PlainBill

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

Now I get 8.0 V.

Bingo!!! The SMPS controller won't start until pin 6 reaches 12 volts. Now there is a problem.

If this were a single power supply, I would say that indicates a problem with the SMPS controller, and suggest you replace it. Even in this case, I would make that suggestion. Unfortunately, Neither Mouser nor DigiKey stock it, and the minimum order is over 1000 parts. Someone is selling the DIP version on eBay, but that would require more than a little work to fit it in place.

So lets go to plan 'B'. Which is a Bear. I've been busy with Paint, and have several test points for your attention. First, the standby SMPS controller is a DIP on the top of the board. What is the part number of that IC? Next, the outputs of the optoisolators have been circled in orange. One of those should change voltage when the 3 volt supply is hooked up. Which one does? Lastly, an area of the board has very crudely been outlined in yellow. I would like a detailed (larger!!!) picture of that area.

PlainBill

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

With the 3v supply hooked up, I read 5.9V across pins 4 and 6. Then for the optoisolators, read from left to right in the pic being IC903, IC905 and IC907, circled in orange, and NO 3v hooked up, I get 0.4v, 10.3v and 1.1. Then connecting the 3v power supply, I get 8.1, 0.3, 1.1.

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

With the 3v supply hooked up, I read 5.9V across pins 4 and 6. Then for the optoisolators, read from left to right in the pic being IC903, IC905 and IC907, circled in orange, and NO 3v hooked up, I get 0.4v, 10.3v and 1.1. Then connecting the 3v power supply, I get 8.1, 0.3, 1.1.

Great picture!!

OK, it is obvious IC907 is related to the standby supply, while IC903 and IC905 are related to the main supply. I'll have to consult the datasheet to figure out which is which. Tomorrow.

PlainBill

[Mach1]

Re: Philips 32PFL3403d/27 LCD NO POWER

I guess I'm understanding my handicam a bit more to get a beter close-up, that and I played with the lighting.

I did see some power supply boards for this TV on the net for sale, do you think they are as bad as this one? I was looking to satisfy my curiosity. One was for $60 some odd bucks and the other was for $200 something and I don't want to dump that kind of cash into this thing.. I guess if we can't get this thing to go, I'm dumping it and will NEVER EVER buy a philips made TV.

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

I guess I'm understanding my handicam a bit more to get a beter close-up, that and I played with the lighting.

I did see some power supply boards for this TV on the net for sale, do you think they are as bad as this one? I was looking to satisfy my curiosity. One was for $60 some odd bucks and the other was for $200 something and I don't want to dump that kind of cash into this thing.. I guess if we can't get this thing to go, I'm dumping it and will NEVER EVER buy a philips made TV.

There is nothing wrong with Philips TVs. They aren't the top of the line, but at least documentation is available for them, unlike the Vizios and the private label junk coming out of China.

IC903 provides feedback for the SMPS controller, so IC905 is handling the On/Off control.

This is going to take a while.

Step 1: Check the resistance from J923 to pin 3 of IC905.

Step 2: To be determined. I'm having problems tracing a link from Pin 6 of IC901 to pin 4 of IC905.

PlainBill

[Dgtech]

Re: Philips 32PFL3403d/27 LCD NO POWER

I'm dumping it and will NEVER EVER buy a philips made TV.

This would include Vizio, LG, and Magnavox. All are made with Philips parts. All are WalMart specialties - go figure.

[PlainBill]

Re: Philips 32PFL3403d/27 LCD NO POWER

This would include Vizio, LG, and Magnavox. All are made with Philips parts. All are WalMart specialties - go figure.

Excuse me, but you do NOT know what you are talking about. Philips and LG are separate companies. Philips may buy panels from LG; I do know they buy them from Samsung. Magnavox is now owned by Philips; LG Electronics owns the Zenith name.

From Wikipedia:

Koninklijke Philips Electronics N.V. (Royal Philips Electronics), most commonly known as Philips, (Euronext: PHIA, NYSE: PHG) is a multinational Dutch electronics company.

Philips is one of the largest electronics companies in the world. In 2010, its sales were €25.42 billion. The company employs 119,000 people in more than 60 countries.[1]

Philips is organized in a number of sectors: Philips Consumer Lifestyle (formerly Philips Consumer Electronics and Philips Domestic Appliances and Personal Care), Philips Lighting and Philips Healthcare (formerly Philips Medical Systems)."

Also from Wikipedia

LG Electronics (Korean: LG전자, KRX: 066570, LSE: LGLD) is a global electronics company headquartered in Yeouido, Seoul, South Korea. LG Electronics is the world's second-largest manufacturer of television sets[1] and third-largest producer of mobile phones.[2]

It is the flagship company of LG Group, one of the world's largest electronic conglomerates.

The company has 75 subsidiaries worldwide that design and manufacture televisions, home appliances, and telecommunications devices. LG Electronics owns Zenith Electronics and controls 37.91 percent of LG Display.

Frankly, knowing how important pattern recognition is to troubleshooting, I'm surprised you could ever confuse Philips TVs with LG TVs.

PlainBill