Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

[jason123]

Hi
I have this Philips 55PFL5601/F7 TV, seems to have all the right voltages including the PS-ON+21V (20.967V) and P-ON=H2 (3.3V) but front LED is not lit, no response to remote and not turning on.

The keypad connects to front IR board, then from IR board, there is a ribbon cable that goes to main board. Haven't tested that link. But, with PS-ON+21V high, TV should be on, right? I'm not getting picture, backlight or any activities.

I read some posts about C3214 or so.. but doesn't seem applicable.

Help!

[petehall347]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

check the led it might be faulty .

[neilc6]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

If you have standby voltage and you have no standby light or the TV doesn't turn on, the main board is suspect. You can try freezing the flash/eeprom or heating it up but usually with no standby light, the processor is pretty dead and isn't even sending the logic control signal to turn on the LED.

Do you have 13V at AMP+13V?

Edit: Just noticed you mentioned P-ON goes high. Does it toggle when turned on and off?

[Davi.p]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

I agree with Neil, i suggest you to wait several minutes, sometimes it starts blinking an error code in some other Philips tv, then get service manual and check table..

[jason123]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

If you have standby voltage and you have no standby light or the TV doesn't turn on, the main board is suspect. You can try freezing the flash/eeprom or heating it up but usually with no standby light, the processor is pretty dead and isn't even sending the logic control signal to turn on the LED.

Do you have 13V at AMP+13V?

Edit: Just noticed you mentioned P-ON goes high. Does it toggle when turned on and off?

Yes, I have the 13V at AMP+13V. P-ON is always high, and doesn't toggle with remote or keypad.

Judging by online search, there doesn't seem to be a replacement flash / eeprom for this? The processor heatsink is "warm" to the touch, but that's just Iq power probably.

[jason123]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

I agree with Neil, i suggest you to wait several minutes, sometimes it starts blinking an error code in some other Philips tv, then get service manual and check table..

It has been plugged in all night an unfortunately, no activity.

[Davi.p]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

It is possible that there is a standby spi flash firmware corrupted. Better to search the service manual to locate that memory without lifting the heatsink..

[Diah]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

check the 3.3V on main boards.. you have the test points of this line at the WLAN module.
if its there 3.3V or not you need to take out the heat sink to have access to the rest under it..
BTW can you write the label of the NAND its covered with firmware version label

[jason123]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

check the 3.3V on main boards.. you have the test points of this line at the WLAN module.
if its there 3.3V or not you need to take out the heat sink to have access to the rest under it..
BTW can you write the label of the NAND its covered with firmware version label

3.3 V is present (3.32V)
Per the service manual, the IC (IC3102):
IC3102 IC NAND FLASH 4GB H27U4G8F2ETR-BC NSCA0R0HY050

[Diah]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

3.3 V is present (3.32V)
Per the service manual, the IC (IC3102):
IC3102 IC NAND FLASH 4GB H27U4G8F2ETR-BC NSCA0R0HY050

i suspect the main IC

[Davi.p]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

So is there an spi flash without that i download the service manual?

[Diah]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

with PS-ON+21V high, TV should be on, right? I'm not getting picture
Help!

forget to mentioned did you check the Optical audio output if its led lids Red ?
this sign i used always as the set turning on.

[jason123]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

forget to mentioned did you check the Optical audio output if its led lids Red ?
this sign i used always as the set turning on.

Hi,
Not activity on the optical audio - no red light at all

[jason123]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

So is there an spi flash without that i download the service manual?

not SPI protocol, but Yes, this 2-wire serial port is on the edge of the board

[Davi.p]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

No you don't understand me, i'm searching for a serial eprom spi that is probably under heatsink, so no messing around , lift the heatsink an make a photo..

[jason123]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

No you don't understand me, i'm searching for a serial eprom spi that is probably under heatsink, so no messing around , lift the heatsink an make a photo..

Only processor and DDR (Memory ICs) under heatsink. No Serial eprom.

[Davi.p]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

-Test voltage on C3719
-Test voltage on L3603
-Test voltage on L3604
-Test voltage on L3606
-Test voltage on L3602
-Read marking on IC3610 and test voltage on each pin.

[Diah]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

Hi,
Not activity on the optical audio - no red light at all

hi,
i dont think its easy to repair this shit sandwich boards, i saw many BGA issue that under the main IC there was hole. so give try with hot air gun. if no fix then replace the boards.

[jason123]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

-Test voltage on C3719
-Test voltage on L3603
-Test voltage on L3604
-Test voltage on L3606
-Test voltage on L3602
-Read marking on IC3610 and test voltage on each pin.

C3719 4.92
L3603 4.93
L3604 1.043
L3606 3.32
L3602 1.47
Marking on IC3610 GH16D
5 V in, 3.32 V out

[Davi.p]

Re: Philips 55PFL5601/F7 Voltages ok, But not turning on - No front light

BAD PROCESSOR, make reflow or reballing much better reballing.