Re: Phillips 42PF7421D/37 Chassis EL1.1U AA - 2 long, 5 short blinks no display
I've checked the fuses on the inverter boards and they are fine.
Did notice that if I unplug 1304/1309 and plug in the power; that the red led flashing switches to 6 quick flashes.
AtomicPunk
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Last Activity: 10-09-2022, 12:42 PM
Joined: 10-06-2018
Location: Windermere
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Re: Phillips 42PF7421D/37 Chassis EL1.1U AA - 2 long, 5 short blinks no display
I looked at the top side of the inverter board next to right speaker - didn't see anything wrong; I've tried operating with the right-hand disconnected; and the left-hand disconnected; also tried disconnecting one side; then the other on the TConn - same results - red flashing; hit power button twice to get relay clickLeave a comment:
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Re: Phillips 42PF7421D/37 Chassis EL1.1U AA - 2 long, 5 short blinks no display
I also observe ~+165VDC on connector 1306Leave a comment:
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Re: Phillips 42PF7421D/37 Chassis EL1.1U AA - 2 long, 5 short blinks no display
The diagram I am referencing is below
1M46
1 GND
2 GND
3 NC
4 NC
5 NC
6 NC
7 +5V2 STBY - observed: +5V3
8 NC
9 +12V - observed: 0, goes to +12V with relay click, then drops
10 NC
11 +12V - observed: >1V, goes to +12V with relay click, then drops
1M03
1 BCKLIGHT CTL - observed: 0V, .1V with relay click, then drops
2 NC
3 LAMP ON - observed: >1V constant
4 GND
5 NC
6 NC...Leave a comment:
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Re: Phillips 42PF7421D/37 Chassis EL1.1U AA - 2 long, 5 short blinks no display
I have only witnessed the backlight flash once; as I was testing applying/removing power at different intervals. I don't believe that the display is working and that it's a backlight issue, I have not witnessed anything on the display with a flashlight.Leave a comment:
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Re: Phillips 42PF7421D/37 Chassis EL1.1U AA - 2 long, 5 short blinks no display
Observed voltages - I would measure, toggle the power button as well.
1M03 - to 1J02 - B01B Supply
9 +5V2-Relay-IO2_PWM - observed +5.3 goes to +5.4 when relay click
4 GND
1303
1 >1v, 24v with relay click returns to >1V
2 >1V, 24v with relay click returns to >1v
3 nothing
4 nothing
1304
1-2 +12_24v (expected) - observed 0, +24v with relay click, returns to 0
3-4 +12v (expected) - observed:...Leave a comment:
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Re: Phillips 42PF7421D/37 Chassis EL1.1U AA - 2 long, 5 short blinks no display
Relay does click when i hit power button; red led flashing stops; but no display or backlight activity. If I hit power button again; relay click, and red led flashing resumes.
I will check the voltages tomorrow morning. Thanks for the references and page numbers.Leave a comment:
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Phillips 42PF7421D/37 Chassis EL1.1U AA - 2 long, 5 short blinks no display
Phillips - Model 42PF7421D/37 - Chassis EL1.1U AA
No display - 2 long, 5 short led blinks - is this error code 25?
I've downloaded the training manual and chassis manual from another thread. Lot of information to try to digest.
I see no visible capacitor issues - fuses checked and are ok.
Any tips on voltage check points would be appreciated.... -
Re: TCL LE48FHDF3300Z - No Picture
I contacted shopjimmy via e-mail - a little surprised by the response:
"Sorry no we do not sell the EEPROM's. You can try PTS Electronics 812-676-1200."Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
I did send them an e-mail. Does the EEPROM have to be programmed? Or is this just NVM and I just need to replace existing chip with a new one?
Unfortunately I can't make out anything legible on the existing chip.Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
I was unable to locate any sort of reset button. However, tried holding down various buttons while plugging in - and I was able to get it back up and running. Unfortunately I have been unable to locate any firmware to update it with.
But still must go thru a specific sequence in order to get the tv to start up, i'll get a picture of the service menu tomorrow....Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
Before when plugging in the TV - then unplugging it for 1 minute; then plugging it back in after 30 seconds; I could get it to power up and run.
I went into the service menu - I turned on Factory Mode hotkey - which I thought was a reset of the NVM - but according to the manual just allows you to go into the service menu without having to go thru the extra steps.
Also I believe that Warm-up got turned on - but then also I did a NVM reset - the tv turned off - and I could never get the power light to illuminate again.
...Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
I went into the service menu - cleared NVM then hit FAC HOTKEY - I think that inadvertently turned on fast startup - so I can no longer get the unit to power on. Not good. Unfortunately I don't see any logic boards available that are of the same model (and reasonably priced) - 40-RSC803-MAD2HGLeave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
Any suggestions, thoughts on why I have to follow this sequence to get it back on - and/or if i should just replace the main power supply board?Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
When I opened up the back further while disconnecting the logic board it started working - i hadn't seen the backlights working before. I reassembled the TV. However, once it is on, if I hit the power button; I can't get the TV back on.
I believe the sequence to get it back running is that I must leave it unplugged to 1 minute; then plug it in; wait 10 seconds then hit the power.
I am not 100% certain on the 3.3VSB - as i might have not had good connection.
I've attached a photo of it working - so panel...Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
Also when I was checking P-on before the 2.5v wasn’t constant.
Sound the 3.3vsd be constant? I got no reading when the tv was off or on.Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
The power light goes out as soon as I press the power button, tried using dust off to cool the eeprom, but didn’t see any change. I do not see any backlight flicker or picture or have any sound.Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
Voltage Checks - all on the main power board
From power board to sub-power
pin - label - "off" - "on"
1 - A_DIM - .1 - .2
2 - P_ON - .1 - .2
3 - BL_ON - .1 - .2
4 - PT - 0 - 0
5 - GND
6 - GND
7 - GND
8 - GND
9 - GND
10 - 24V - .2 - 24.4
11 - 58V - .2 - 55.3
12 - 58V - .2 - 55.3
13 - 58V - .2 - 55.3
14 - 58V - .2 - 55.3
From main power to logic board
Pin - Label - "off" - "on"
1 -...Leave a comment:
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Re: TCL LE48FHDF3300Z - No Picture
Thanks for the reply!
I have not seen anything from the back lights. Was hoping there would some service manuals that would give me specific locations to check voltages.
I haven't attempted any voltage checks - the front of the PCB do not have many indicators of where to check voltages.
I've attached some updated photos from the back side - assume that's my best location to check as there are some markings - still need to do more research to figure out what some of these mean.
I'll review...Leave a comment:
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TCL LE48FHDF3300Z - No Picture
Picked up a TCL LE48FHDF3300Z - when plugging in I see the power light on the front come on. When turning on the power either with remote or power button, the light goes out - don't see anything on the screen.
I've also tried disconnecting the left - then the right t-con connector - again, power light will come on; then when pressing power button the light goes off - nothing appears on the screen.
Model: LE48FHDF3300Z
Power board: 40-E461C4-PWI1XG PE461C4
Sub power: 40-RL5510-DRE1XG
t-con : SQ60PB_MB34C4LV0.1
Main board: 40-RSC803-MAD2...
No activity results to display
Leave a comment: