Philips 42PFL7403D Doesnt turn on

**selldoor** · 08-09-2012, 01:13 PM

Re: Philips 42PFL7403D Doesnt turn on

GREAT!!! couple of possibilities Plug or Connector or Cable
Take apart and check closely with a magnifying glass. Are pins on the board
loose/bent can they be soldered/straightened.
The hollow pins on the plug can sometimes be extracted then you can resolder to the wire.
If there is a break in the wire is it going to be long enough if you shorten it
or else you will have to join some more wire on to it, solder on the hollow pins and refit into the plug

**pacmyc** · 08-09-2012, 01:22 PM

Re: Philips 42PFL7403D Doesnt turn on

Originally posted by selldoor

GREAT!!! couple of possibilities Plug or Connector or Cable
Take apart and check closely with a magnifying glass. Are pins on the board
loose/bent can they be soldered/straightened.
The hollow pins on the plug can sometimes be extracted then you can resolder to the wire.
If there is a break in the wire is it going to be long enough if you shorten it
or else you will have to join some more wire on to it, solder on the hollow pins and refit into the plug

No they are not loose or bent. The cable is also fine.
However, there seems to be a short on the board between pin 2 and 9.

I the schematics pin 2 is ground, and pin 9 goes nowhere except for FFAA (which I think is a test-point). Am I correct?

Update: but on the SSB side pin9 seems to be some kind of TACT_SWITCH_INT, that could cause the standby to halt..:S

**selldoor** · 08-09-2012, 02:10 PM

Re: Philips 42PFL7403D Doesnt turn on

Can you do a pic of the back of the board and can you mark the next joint pin 2 and 9 go to on each picture

What happens if you unplug the button cable and use the remote only?

**pacmyc** · 08-10-2012, 08:43 AM

Re: Philips 42PFL7403D Doesnt turn on

Originally posted by selldoor

Can you do a pic of the back of the board and can you mark the next joint pin 2 and 9 go to on each picture

What happens if you unplug the button cable and use the remote only?

I can't see where the pin 2 and 9 goes because it's a multiple layer board.

With the keyboard cable disconnected it behaves exactly the same.

Attached Files

**pacmyc** · 08-17-2012, 10:19 AM

Re: Philips 42PFL7403D Doesnt turn on

I have ordered a new LED panel control. I will let you know if it fixes the problem with the TV or not.

**pacmyc** · 08-27-2012, 09:48 AM

Re: Philips 42PFL7403D Doesnt turn on

Got the new LED panel control today. Still the TV works exactly the same :S
It has problems turning on. If removing the 8-pin cable from the led panel control and connecting (to half), I can hear the PSU starts working, and then white LED starts flashing. In a few seconds TV is on.
If I now turn off the TV I cant turn it back on without doind the same procedure again.

Im starting to get tired of this TV now, asking you for your last ideas before throwing this set into the trash..

**pacmyc** · 08-27-2012, 01:20 PM

Re: Philips 42PFL7403D Doesnt turn on

Originally posted by pacmyc

If removing the 8-pin cable from the led panel control and connecting (to half), I can hear the PSU starts working, and then white LED starts flashing. In a few seconds TV is on.

I was wrong, the cable is connected 100%. It seems like some signal on this conector needs to go low to start the rest of the TV.

**budm** · 08-27-2012, 02:05 PM

Re: Philips 42PFL7403D Doesnt turn on

Is this the manula you are using/ I want to make sure I am reading the same one.

**selldoor** · 08-27-2012, 03:33 PM

Re: Philips 42PFL7403D Doesnt turn on

Originally posted by budm

Is this the manula you are using/ I want to make sure I am reading the same one.

Yes he has exactly the same link in post1
"http://elektrotanya.com/philips_chassis_q529.1e_la_sm.pdf/download.html"

**budm** · 08-27-2012, 04:00 PM

Re: Philips 42PFL7403D Doesnt turn on

OK, I will download and study it tonight.

**budm** · 08-27-2012, 08:50 PM

Re: Philips 42PFL7403D Doesnt turn on

OK, I looked at the service manual, it does not seem to match what you have. In your pictures of the LED panel board, it has two connectors, but the diagram shows 3 connectors. Does the connector on the left go to the Keypad? What happen if you disconnect that and use the remote to turn on instead (the 9-pin connector is in place and connected to the main board?
Do you have the chassis number of this TV?

Attached Files

**pacmyc** · 08-28-2012, 09:43 AM

Re: Philips 42PFL7403D Doesnt turn on

Originally posted by budm

OK, I looked at the service manual, it does not seem to match what you have. In your pictures of the LED panel board, it has two connectors, but the diagram shows 3 connectors. Does the connector on the left go to the Keypad? What happen if you disconnect that and use the remote to turn on instead (the 9-pin connector is in place and connected to the main board?
Do you have the chassis number of this TV?

Hi,
Yes the third connector (1P09) is just prepared on the board, it doesn't have the plastic holder but the solderpoints are there.
Could the actual chassis be Q591E? (When looking at what software version is installed in SAM-menu). Or is that just the software version?

There is no different behaviour of the TV with or without the 4-pin keyboard cable connected. However, if trying to start the TV with the keyboard buttons it will just kill the red front led and TV will not start.
Also, when TV has started I can use the keys on the keyboard, BUT! if i keep a key on it pressed for more than 1 second the TV shuts down.. Strange

Attached Files

**pacmyc** · 08-28-2012, 10:08 AM

Re: Philips 42PFL7403D Doesnt turn on

.

**budm** · 08-28-2012, 10:58 AM

Re: Philips 42PFL7403D Doesnt turn on

The chassis number is on the same tag as the model tag on the back of the TV.
From what I can see in the diagram, their only 3 signals that are generated by the LED panel that get sent o the processor: 1 signal is the key pad (I was thinking that the Power key was stuck on, so when you insert the connector in lsowing it turns on the TV but then you cannot turn it off due to stuck key, that is why I suggested you to disconnect the key pad). 2nd signal is the IR Remote signal (RC) from the IR module. 3rd is the light detetor (for auto brightness?). Since you can insert the connector (9-pin) slowly into the LED panel board to make the TV comes on, then it has to be one of the 3 that is giving you the problem, keypad is not one of them. IR signal will be the next one to try.

**pacmyc** · 08-28-2012, 11:13 AM

Re: Philips 42PFL7403D Doesnt turn on

Originally posted by budm

The chassis number is on the same tag as the model tag on the back of the TV.
From what I can see in the diagram, their only 3 signals that are generated by the LED panel that get sent o the processor: 1 signal is the key pad (I was thinking that the Power key was stuck on, so when you insert the connector in lsowing it turns on the TV but then you cannot turn it off due to stuck key, that is why I suggested you to disconnect the key pad). 2nd signal is the IR Remote signal (RC) from the IR module. 3rd is the light detetor (for auto brightness?). Since you can insert the connector (9-pin) slowly into the LED panel board to make the TV comes on, then it has to be one of the 3 that is giving you the problem, keypad is not one of them. IR signal will be the next one to try.

Sorry, now I found the chassi number on the tag, it is Q529 1E LA

OK. No stuck key, and also the keys do work when the TV is on. But if a button pressed for more than 1 second it shuts down the TV.
Its not the IR signal or the light detector because I have replaced the LED panel control board with a brand new one.

I wrote that I could slowly connect the 9-pin cable back to get the TV to turn on, is wrong. Sorry, I thought so at that point but later I found out that I can connect it fully with the same result. The important thing is that the cable is fully disconnected and then fitted back. (At that point I thought it was due to a bad contact in the connector)

**selldoor** · 08-28-2012, 03:15 PM

Re: Philips 42PFL7403D Doesnt turn on

Can you do a picture of the area of the board near the socket (9pin)
Front & Back say 4 to 6 inches

**budm** · 08-28-2012, 07:08 PM

Re: Philips 42PFL7403D Doesnt turn on

"The important thing is that the cable is fully disconnected and then fitted back" and that will make the TV come on? it sounds like the processor is looking for a pulse from one the three input lines.

**pacmyc** · 08-29-2012, 09:46 AM

Re: Philips 42PFL7403D Doesnt turn on

Originally posted by selldoor

Can you do a picture of the area of the board near the socket (9pin)
Front & Back say 4 to 6 inches

Here you go

Attached Files

**pacmyc** · 08-29-2012, 09:48 AM

Re: Philips 42PFL7403D Doesnt turn on

Originally posted by budm

"The important thing is that the cable is fully disconnected and then fitted back" and that will make the TV come on? it sounds like the processor is looking for a pulse from one the three input lines.

Maybe I should start cutting the wires on this 9-pin cable, and see when after which of the connectors the PSU will turn on?
Would this info be helpful?

**budm** · 08-29-2012, 11:32 AM

Re: Philips 42PFL7403D Doesnt turn on

I would try removing the RC line pin3 (there are only 3 signals, keypad (pin7), RC (REMOTE IR receiver, and light sensor pin1, not sure about pin 9 for the TACT SWITCH).

Philips 42PFL7403D Doesnt turn on

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