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 goes on, after 1 second, the led8001 lights and a relay goes on, after 1 second, the 2 led "stop" and the 2 relays falls down.
On a small daughter card on the PSU, a very small led brights a message : 4 times on and a long off, and the message repeats.
The concerned PSU is labelled LJ44-0018A.
After watching all the references and indications on the PSU, I found the explanations for the led message :
1 time for VA, 2 for 12V, 3 for VSCAN, 4 for D3V3, 5 for VS, 6 for VCC, 7 for VSET, 8 for VE, 10 for PFC_OK, 11 for OVP and 13 for D5VL.
With my PSU, the 3.3V falls down very quickly after a power up.
I have replaced the 2 famous caps C8059 et C8060 and all is now fine.
There was no external problems with these two caps. The previous owner had the same problem two years ago, and a technician had done the same job. The original caps worked for 4 years and the new only for 2 years.
It's always the same problem with high frequencies in PSU.
If somebody had problems with a different message timing to confirm the diag it could be fine.
This PSU can be found in other plasma (to be completed) :
- Philips 50PF7321D37
- Philips 50PF9431D37
- Magnavox 50MF231D37
In my case, I have to check the TV for a longer period to confirm it was the only problem.
P.S. : If you find some mistakes, don't hesitate to send me the correct sentences in a PM.
Thanks.
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 goes on, after 1 second, the led8001 lights and a relay goes on, after 1 second, the 2 led "stop" and the 2 relays falls down.
On a small daughter card on the PSU, a very small led brights a message : 4 times on and a long off, and the message repeats.
The concerned PSU is labelled LJ44-0018A.
After watching all the references and indications on the PSU, I found the explanations for the led message :
1 time for VA, 2 for 12V, 3 for VSCAN, 4 for D3V3, 5 for VS, 6 for VCC, 7 for VSET, 8 for VE, 10 for PFC_OK, 11 for OVP and 13 for D5VL.
With my PSU, the 3.3V falls down very quickly after a power up.
I have replaced the 2 famous caps C8059 et C8060 and all is now fine.
There was no external problems with these two caps. The previous owner had the same problem two years ago, and a technician had done the same job. The original caps worked for 4 years and the new only for 2 years.
It's always the same problem with high frequencies in PSU.
If somebody had problems with a different message timing to confirm the diag it could be fine.
This PSU can be found in other plasma (to be completed) :
- Philips 50PF7321D37
- Philips 50PF9431D37
- Magnavox 50MF231D37
In my case, I have to check the TV for a longer period to confirm it was the only problem.
P.S. : If you find some mistakes, don't hesitate to send me the correct sentences in a PM.
Thanks.
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