philips 42pfl5432d got sound no backlight

[retiredcaps]

Re: philips 42pfl5432d got sound no backlight

pin 2=4.98

At 4.98V, the 78M05 is well within spec. Move on.

[allsmith]

Re: philips 42pfl5432d got sound no backlight

Clicking sound?

yep one very quiet click when hitting power button,seems to be around the ic's,i'll get a paper towel roll and see if thats where its coming from

[allsmith]

Re: philips 42pfl5432d got sound no backlight

its more like a tiny, very tiny! chirp

[allsmith]

Re: philips 42pfl5432d got sound no backlight

Same drill on testing U3 ? test all pins and report?


Also did you look at my inverter test results in pic? tested on 20k scale on my meter.
I should have done higher resolution,but a couple went OL/1 on 2000 scale so i set the 20k

I can retest if need be.

[budm]

Re: philips 42pfl5432d got sound no backlight

The 324 is a quad OP-AMP. I do not know if you see the link to shojimmy.com, these two-board set (re-built) is less than $50. So even if you find out you have bad IC, I do not believe it will be practical for you to buy the equipment to work on surface mounted components. You may want to think about that.
http://www.shopjimmy.com/philips-996...it-rebuild.htm

[retiredcaps]

Re: philips 42pfl5432d got sound no backlight

Also did you look at my inverter test results in pic?

The resistance inverter test indicate they are all likely good.

[allsmith]

Re: philips 42pfl5432d got sound no backlight

The 324 is a quad OP-AMP. I do not know if you see the link to shojimmy.com, these two-board set (re-built) is less than $50. So even if you find out you have bad IC, I do not believe it will be practical for you to buy the equipment to work on surface mounted components. You may want to think about that.
http://www.shopjimmy.com/philips-996...it-rebuild.htm

yep thats what i was starting to think,Yeah 50 for both not bad at all.

Would you recommend replacing both the master and slave together,or would just replacing the master be ok?

I think i found just the master on ebay for around 25

What are the main numbers to go by on the board? The numbers printed on the board? Or the numbers on the white sticker with bar code?

The one i found ,the printed on the board numbers matched,and most all numbers matched on the paper sticker,but not all.

Also is it really possible to see a faint image on the screen if the display was working with a flashlight??

I cant see nothing,Is there a trick for the flashlight test??

Would feel better if i knew it was actually working

[budm]

Re: philips 42pfl5432d got sound no backlight

I would get the numbers on the barcode of both boards and contact shopjimmy to verify, he does free shipping also.

[allsmith]

Re: philips 42pfl5432d got sound no backlight

The resistance inverter test indicate they are all likely good.

Thanks a ton for your time, patience,and help!! I greatly appreciate it!!!

[allsmith]

Re: philips 42pfl5432d got sound no backlight

I would get the numbers on the barcode of both boards and contact shopjimmy to verify, he does free shipping also.

Thanks so much for your time and help!! i greatly appreciete it!!!
I will contact shopjimmy
Still curious about the flashlight trick,is it possible to see a image?

thanks man!!

[budm]

Re: philips 42pfl5432d got sound no backlight

IT depends on where the images are on the screen, you may have to move the flash lights around the whole panel see if you can see anything.

[allsmith]

Re: philips 42pfl5432d got sound no backlight

The 324 is a quad OP-AMP. I do not know if you see the link to shojimmy.com, these two-board set (re-built) is less than $50. So even if you find out you have bad IC, I do not believe it will be practical for you to buy the equipment to work on surface mounted components. You may want to think about that.
http://www.shopjimmy.com/philips-996...it-rebuild.htm

Im havn't got with shopjimmy yet but plan on it here soon and get the inverter boards.

Do you think they want my boards as a core?

If they dont want them back,I was thinking about going on and trying to find the problem IC and using chip quick to remove the IC

Have you used chip quick before? Would it work to remove the IC with my weller wes51?

I can get all kinds of electronics at my local recycling yard for 20 cents per pound! You wouldnt believe what ppl take to this place as scrap metal!!!
Cable box's,dvd player's,stereos,vcr's,computers, vintage stereo's,even vintage analog meters and test equiptment!!!

I can get plenty of boards to practice surface mount on!!

If i wasn't to do a lot of surface mount,could i get away with chip quick and my weller, or do i have to get a hot air station?

Thanks!

[retiredcaps]

Re: philips 42pfl5432d got sound no backlight

If i wasn't to do a lot of surface mount,could i get away with chip quick and my weller, or do i have to get a hot air station?

I use a non temperature controlled heat gun and protect the components with Kapton tape. It takes about 30 seconds to remove the smd device.

[allsmith]

Re: philips 42pfl5432d got sound no backlight

I use a non temperature controlled heat gun and protect the components with Kapton tape. It takes about 30 seconds to remove the smd device.

Interesting, I will try that,can i get Kapton tape at mouser or digikey?

[retiredcaps]

Re: philips 42pfl5432d got sound no backlight

Interesting, I will try that,can i get Kapton tape at mouser or digikey?

http://www.digikey.com/product-searc...66785?k=kapton

I got mine from ebay.

http://www.ebay.com/itm/150697814679

I got 100ft the widest one (20mm) that I could find for under $5. With the widest one, I can always cut down to size.

[allsmith]

Re: philips 42pfl5432d got sound no backlight

I recieved the master and slave inverter boards that i ordered from shopjimmy today,but I still have no backlights guys.
I double checked all the connections,and pretty sure i got everything hooked up right.
I still hear that one tiny quiet chirp on the main inverter board when turning on tv.
I can also can hear one tiny chirp on the main board,when turning on.
I still have sound, but have not been able to see an image on the screen with a flashlight.
The main board is getting warm( some places around 100 degrees tested with infared temp gauge)
Im still getting 24.4 v on each inverter board,and 3.3v on BL_ON.
I notice that there is a ribbon connection on the master inverter board that goes to the small board thats above the main board(I think i have read that it is called the P CON board??)
Could that board cause the inverters not to kick in?
I did fail to mention before that there is a small scuff/scratch in the screen that just barely got into the coating on the screen.(around 1/8'' long)
Dont appear to have been a violent scratch but just maybe happend when the other people had it on its face and was working on it?
But its possible it could have took a blow,I dont know.
Could lamps break from an impact? If one lamp was say broke or burned out would the rest of the lamps still work?
Any other ideas guys? Any help would be appreciated

[Mr Bill]

Re: philips 42pfl5432d got sound no backlight

I'm not a 100% positive but on a computer monitor if a bulb is broken the backlight will still flash on for a second. I would think it would be the same for a tv but i could (probably am ) wrong. What is the panel on your tv. I have a 42" magnavox with a defective screen that you might be able to salvage the bulbs out of IF it turns out to be the culprit.

[retiredcaps]

Re: philips 42pfl5432d got sound no backlight

I notice that there is a ribbon connection on the master inverter board that goes to the small board thats above the main board(I think i have read that it is called the P CON board??)

Post a picture of it.

If one lamp was say broke or burned out would the rest of the lamps still work?

It all depends on the implementation of the pwm chip on the inverter. Some pwm chips turn on all the ccfls at once and then check with 1 to 2 seconds if everything is okay. If yes, the ccfls stay on. If not, then the pwm chip shuts down all the ccfls. We call this "2 second to black". My sig file has more info about it.

[allsmith]

Re: philips 42pfl5432d got sound no backlight

Post a picture of it..

Sorry still cant get the hang of getting good pics,Im trying

[budm]

Re: philips 42pfl5432d got sound no backlight

It looks like they are for Dimming control signals for the backlights. That is the T-CON it is connected to.