Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

[beng3518]

Need a little help please...

Replaced two caps (pic 3), SSB and T-Con board and still won't turn on...

Did some tests:

Put a jumper on CN6 pin 2 (2.6v) to Pin 4 (ground) to check the backlights (pic 5) and after a few min it did turn on (pic 6), then added another jumper from CN6 on Pin 1 (3.3v)st to CN7 on pin 5 (inv_on) (pic 7) after connecting the power cable immediately the back lights turn on (pic 8)

Then checked voltages (pic 9)

Questions:
On (pic 9) the voltage from the SSB on pin 8 (+5v SW) to the "IR Led Panel" pin 8 (+5v) reads 5v but I'm only getting 38.5 mv; do this means the SSB is defective?? Even so I just replaced

The test to the backlights which did turn on and voltage check on the PSU were correct, this mean the PSU is good??

And if the backlights turn on before I replaced the T-Con board means that this one was not defective??

Can you please help me on this one? Give me some suggestions or tests, or should I just give up??

Thank you so much for taking the time on reading this...

[martino]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

If you unplug the IR board,does the 5volt come back up?

[beng3518]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

If you unplug the IR board,does the 5volt come back up?

It does not, actually it read lower:

9- Keyboard = 8.6 mv (this one reads lower too)
8- +5v SW = 000.7 mv
7- Keyboard = 1.4v

[martino]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Where did you get the mainboard from? eBay?
I'm thinking its defective...

[martino]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Can we get a picture from the mainboard? Front and back ?

[selldoor]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Can we get a picture from the mainboard? Front and back ?

It also needs to be in focus - can you re do the power supply picture front and back.

Have you tested that small yellow fuse (think its a fuse can barely see it) near the connector

[beng3518]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Here are the pictures from the PSU

[beng3518]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Where did you get the mainboard from? eBay?
I'm thinking its defective...

Got it thru amazon.com

[selldoor]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

So 2 small fuses F200 F201 - are they good. Also that group of resistors near the
connector looks to be hot - maybe the light but joints look ringed - perhaps you should reflow those.

[beng3518]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Here are the pictures from the SSB:

[beng3518]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

So 2 small fuses F200 F201 - are they good. Also that group of resistors near the
connector looks to be hot - maybe the light but joints look ringed - perhaps you should reflow those.

How do I check the small fuses? Continuity? If yes; they are good

and which resistors? Pic 1 or 2?

[selldoor]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

White the boards are out can you do a pic of each showing the full board.

[selldoor]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

How do I check the small fuses? Continuity? If yes; they are good

and which resistors? Pic 1 or 2?

Continuity is ok but ohms are better. Oddly enough we have had cases where fuses give a continuity beep but were actually blown.

I was meaning Pic 2 if you look at them closely you may find they are ok.
Pictures sometimes have shadows that make things look worse than they are.
I didnt get drawn to pic 1 perhaps as they are on the side of the board
there is less light. Usually recommend daylight rather than flash.

[beng3518]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

White the boards are out can you do a pic of each showing the full board.

Like this?

[beng3518]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Continuity is ok but ohms are better. Oddly enough we have had cases where fuses give a continuity beep but were actually blown.

I was meaning Pic 2 if you look at them closely you may find they are ok.
Pictures sometimes have shadows that make things look worse than they are.
I didnt get drawn to pic 1 perhaps as they are on the side of the board
there is less light. Usually recommend daylight rather than flash.

How do I check ohms?

And would the boards have to be connected and with current?

And if the voltage is correct on the PSU Connectors going to the SSB, would the PSU still bad??

[selldoor]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Sorry as your first post was so good I didnt realise you lack experience
Upside down horseshoe / Omega symbol is to test ohms.

Two simple rules -- Measure voltage with nachine plugged in and turned on (usually when asked)
Measure Resistance -- Voltage off and machine unplugged.

(so for ohms tests boards do not need to be connected or powered)



Perhaps read this :https://www.badcaps.net/forum/showthread.php?t=10419
start at post 19 lots of tests you can do most without power to the board.


If the voltages ARE correct then there is agood chance that the power supply is ok
BUT sometimes they can read good but then when a load is applied (eg lamps come on)
it hasnt got enough umphh to power them.

First test we often ask is on the BIG capacitor. But you need to be very careful
working on a non conductive surface meter on volts you power up Just the power board
and check the voltage (DC) on the BIG Capacitor it may be 300-400 volts.
We also ask if that is maintains steady for 5-10 seconds
Use a RCD if you have one.

If you dont want to do that the next test is initially with just the power supply
check the voltage on each socket -post the results like

CN7
Pin1...12v.... 11.99
Pin2...12v.... 13.72
and so on

Do this for each connector.
Actually I dont see the connector with 24v on where is that?

Then you do it again with the other boards connected.

I see you did the jump start test so as the lamps lit ( did they stay on for a minute or two?) the board should be good. The pins we are interest in are the BLON and Power on. As of they do not get a signal voltage when the machine is switched on
it is likely to be a main board fault.
Another test is to have it all connected then diconnect the lvds cable from the main to the Tcon and see if that aloows the lights to come on ( You may have doen that already?)
Well thats enough to be going on with -you will think I have gone awol

[beng3518]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

Sorry as your first post was so good I didnt realise you lack experience
Upside down horseshoe / Omega symbol is to test ohms.

Two simple rules -- Measure voltage with nachine plugged in and turned on (usually when asked)
Measure Resistance -- Voltage off and machine unplugged.

(so for ohms tests boards do not need to be connected or powered)



Perhaps read this :https://www.badcaps.net/forum/showthread.php?t=10419
start at post 19 lots of tests you can do most without power to the board.


If the voltages ARE correct then there is agood chance that the power supply is ok
BUT sometimes they can read good but then when a load is applied (eg lamps come on)
it hasnt got enough umphh to power them.

First test we often ask is on the BIG capacitor. But you need to be very careful
working on a non conductive surface meter on volts you power up Just the power board
and check the voltage (DC) on the BIG Capacitor it may be 300-400 volts.
We also ask if that is maintains steady for 5-10 seconds
Use a RCD if you have one.

If you dont want to do that the next test is initially with just the power supply
check the voltage on each socket -post the results like

CN7
Pin1...12v.... 11.99
Pin2...12v.... 13.72
and so on

Do this for each connector.
Actually I dont see the connector with 24v on where is that?

Then you do it again with the other boards connected.

I see you did the jump start test so as the lamps lit ( did they stay on for a minute or two?) the board should be good. The pins we are interest in are the BLON and Power on. As of they do not get a signal voltage when the machine is switched on
it is likely to be a main board fault.
Another test is to have it all connected then diconnect the lvds cable from the main to the Tcon and see if that aloows the lights to come on ( You may have doen that already?)
Well thats enough to be going on with -you will think I have gone awol

thank you so much, will try all that, just woke up, had to get some sleep, lol

[ecking767]

Re: Philips 42" LCD TV 42PFL3603D/F7* changed SSB & T-Con Board won't turn on, help

you only replace two bad caps, when its known that the other caps could be failing too.Even if they are not swallowing on the top. I will replace all filtering caps on this power supply. Where did you get the two replacement caps?