Re: Phillips 32PFL4507/F7 screaming power board
Ok so I promised an update.
I got the tv working! Long story short I found an open resistor at R1 on the LCD controller board. It went into the voltage regulator and I recognized that as the same part and layout used on the motherboard. Those take 21V directly in so I assumed that one should have 21V too.
I guess they were using a 0 ohm resistor as a fuse. Which is what they seem to do on the mobo too. This is probably common :p but I don't know this stuff like y'all do. Anyway, replaced it with a bit of wire...
pyrohmstr
Member
Last Activity: 01-02-2017, 02:42 PM
Joined: 04-28-2016
Location: Chicago, IL
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Re: Phillips 32PFL4507/F7 screaming power board
I tried that a few times when it was working. It didn't fix the problems then. You're probably right about the panel being set wrong.
Unfortunately to get into the service menu you have to go through a bunch of sub menus which I just can't do with it not working. I tried a few times.
I'm betting I either blew the main processor pins or the mosfets on the display and I just don't think it's worth dealing with either. Or I totally messed up some internal programming that just can't be recovered.
...Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
I'm sorry, this is literally the only thing on the whole panel...Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
There are no 3 digit numbers anywhere on the panel. The panel only has a sticker with U24F1XH on it
Only 00001324 and 120229 on a sticker on the board.Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Nothing. I switched the eeprom for the old one but I switched it back. Now it's totally how it was when it was working.Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Yes. I get 21V there
I also get 4.6V at VC-ADJ
and 3.3 at VDDDLeave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Motherboard side cable popped loose and shorted. I'm pretty sure the 21V lines shorted to the adjacent ground. They still are 21V when powered.Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
It goes to the main board.
I checked continuity between each pin of the connectors. That all looks good.Last edited by pyrohmstr; 05-21-2016, 10:42 AM.Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Yes, it's long though so multiple pictures.
I checked the cable and get continuity between the pins. I also checked the diodes on there and they look fine. I can't find a schematic anywhere....Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Put the eeprom from the old mobo on the new one. It turns on but still no picture.Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
To be clear:
It was working and in service mode. I touched it and the cable going to the LCD slipped and shorted something (PSU got loud) I panicked and just cut the power.
Now it turns on, but it doesn't display anything. Backlight comes on, responds to remote (turns on and off) and everything. I'm trying to figure out now if it'll connect to something HDMI so I can see if it's actually trying.
So I broke an otherwise easy fix after all this time doing something stupid...Last edited by pyrohmstr; 05-21-2016, 09:11 AM.Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Yeah, but now it has no display at all. I feel really stupid lol.
So close and I fried it.
There doesn't seem to be a fuse or anything on the tcon. The cable is good. I think I may have either fried the motherboard again or the tcon (is it even called a tcon here?) so I just don't know. I tried replacing the eeprom but no luck there either.
Any thoughts on things to try or am I SOL here?Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Just the colors were reversed. Image was fine.
Doesn't matter though. The power board made the overload noise again and now it won't display anything. Back light turns on. It responds to the remote. But there is no image.
There was an image. It was working (minus the colors). But now nothing.
I assume something is wrong with the TCON board but it's one of those soldered-to-the-LCD deals so I don't think that's fixable. Despite all the effort and money I think this thing might be dead for real...Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Ok, so I put in the new board and the TV turns on! Exciting! I can use it and everything.
Major problem though - the image is totally reversed. In service mode it should be red green and blue but is instead magenta, yellowish, cyan. White and black work fine.
Tried resetting it from the service menu (no luck). Left it unplugged for a bit. Tried different inputs. It's always a reversed image. As far as I can tell there is no firmware upgrade available -- it's running TVNB011_00_PF_XX91_AA
...Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Reflow and freeze didn't change anything.
I checked the regulators:
The 1.2v line is only .53v -- that I think that could be a problem since it directly powers the main chip. I've checked every part and I can't find any reason it would be lower. All of the resistors and everything measure fine. I'm thinking maybe I cooked something while troublshooting/reflowing/freezing.
New regulators are $20 from china. I'm just going to risk the $60 to get a new board. I'll report back if anything works. Or if nothing...Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Ok, I replaced the cap with an "identical" one from the bad power supply. Maybe a bad assumption but it'll have to do for now.
I lifted the pin for the H2 and put a 10k (all I have) resistor between it and 3.3 - now my +21v is 21V and the amp+24 is 24.5 .... so that's good I think! PSU seems to work!
The tv still won't turn on though. No power LED, no backlight on. I don't know if it's a power issue somewhere deep in the main board or a logic issue with one of the chips. What do you think?
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Re: Phillips 32PFL4507/F7 screaming power board
Yeah, it's a little SMC - small, rectangular, and tan. The schematic just says 4.7 uF with no other info about it. It has no markings I can see.
It seems the board won't send P-ON-H2 -- either it can't get the instruction to turn on or it's deciding not to. Since it seems the function board is getting the 3.3V I don't think that's an issue. Something logical not working perhaps?
Could I just connect the al-3.3v to the p-on-H2 pin and force it on? Would that be a terrible idea? Not a permanent solution obviously...Leave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
Checking the cable going to the function board I do get AL+3.3V in but no p-on+5V.
The voltage off the regulators is all lower than it should be - I'm think because the power supply can't provide a solid 21V? I can't get the TV to turn on. The LED does work when I power it with my DMM :p but nothing past that.
I'm kinda losing faith here :cLeave a comment:
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Re: Phillips 32PFL4507/F7 screaming power board
It's in my second post attachments. I'll attach it again
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Re: Phillips 32PFL4507/F7 screaming power board
I think I found something!
I removed all three voltage regs on the MB and it was still shorted. Then I randomly removed C3103 by the 1.2V reg and the short went away. Up to ~10Mohms on the p-on+21v rail.
But, I left C3103 off the board. Does it do anything critical? It's near the 1.2V reg on page 51 of the service manual. If it's just a filter or something can I survive without it? .
Secondary problem: the TV still will not turn on. From the schematic it doesn't look like it has a standby LED...Leave a comment:
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