Re: PHILIPS 50PF7521D12 black screen (with some tips)
I think that the PSU is definitively dead : no more 3.3V and 5V...
If someone needs any other board, please contact me asap.
Shadock
Member
Last Activity: 02-26-2012, 02:13 PM
Joined: 12-04-2011
Location: France
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Re: PHILIPS 50PF7521D12 black screen (with some tips)
I've checked the PSU grounding and found a problem on it : the +5V and +3.3V grounds are not well connected. The connection depends on the position of the board, I've wired them together. After this, the PSU restarts without falling in safe mode : I got sound but the screen stay black. The remote controls is working as the DVB-T demodulator. Probably something damaged yesterday with the PSU problem ???Leave a comment:
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Re: PHILIPS 50PF7521D12 black screen (with some tips)
The first picture shows the problem obtained after the first test, it
The second one was after having pushed a connector on the Y-buffer (with TV on...)
The third one is the result of havind disconnected and reconnected all Y-Buffer connectors (TV unplugged this time). This screen is displayed only few seconds before the PSU falls in safe mode displaying error code 13 (VCC problem). I will try to check if there's another GND problem with the PSU this morning....Leave a comment:
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Re: PHILIPS 50PF7521D12 black screen (with some tips)
I found the problem on the PSU board : when removing the two caps (C8059 and C8060), I probably damaged the board, there was no more contact between the GND and minus of the caps. I repared this problem and the PSU is now good. I got picture and sound.
So I had the oppotunity to test during a longer time and saw a problem on the bottom of the screen : I can have all the lines, sometimes only one on two is black and somtimes all are black.
I tried to make a small pressure on the connectors located on the...Leave a comment:
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Re: PHILIPS 50PF7521D12 black screen (with some tips)
I found the old caps : YAGEO (SEK ?) 3300 uF 16V and 35V !!!
The 1 hour test was done with olds caps YAGEO (SC ?) but 6.3V
I made an other test yesterday evening with the new caps from Panasonic (FM) and nothing worked !
There's only one connector using 3.3V, it's CN8006 for the Logic board.
I will test without connecting the logic board with a dummy load on the 3.3vLeave a comment:
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Re: PHILIPS 50PF7521D12 black screen (with some tips)
I found two foam buffers (high density !) in a poor state. What is their use ?
And where do they go (behind the PSU but under what parts ?)Leave a comment:
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Re: PHILIPS 50PF7521D12 black screen (with some tips)
I don't have any idea of the original brand !!! (I will try to find the caps used by the previous technician, if I can find the olds caps ...)
I have done a test with olds caps (from dismantled devices !) : the TV worked fine for an hour before the bottom part of the picture started to flash between the piture and a black one. At the end (10 minutes later), the TV returned to standby with the LED on the control board of PSU repeating the message 3.3V failure.
I have ordered Panasonic caps (FM serie)...Leave a comment:
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Dell Precision 650
A month ago, I started the PC and it banged (a cap explosion was suspected
)but it worked all the day. After having stoped the PC, when trying to start it again, only LED C was yellow, nothing more.
After a mother board inspection, no exploded cap found, but I changed all the 1800uF 6.3V (10 pieces) with Panasonic FC after having seen damages on some of them.
I'm very surprised by two things:
- the PC worked a day long with at least a dead cap,
- nothing damaged by the problem.
If this can be usefull to someboby else ...
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PHILIPS 50PF7521D12 black screen (with some tips)
Hello,
This post is intended to give some help to people experiencing the same problem and to thank the help found in badcaps posts.
After searching things about problems with PSU on Plasma, I found the problem on mine :
Brand : Philips
Model : 50PF7521D12
Chassis : LC4.41E AB
PDP : PDP50HW-YD01
Problem : black screen, the power can light or not, can pass from red to green but the screen is always black.
After having removed the rear panel, if I power the TV, on the PSU card, the led8002 lights and a relay... -
Re: philips 50pf7521d/10 no display fault
I got a 50PF7521D/12 with a PSU labelled LJ44.0018A.
Is it the same as yours ?
ChristianLeave a comment:
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