Philips Plasma 50PF7320/10 worth anything?

[PowerAmpFreak]

Re: Philips Plasma 50PF7320/10 worth anything?

The investigation goes on.
Haven't find anything useful yet, but when I disconnect the supply connector for the SSB from powersupply board, the powersupply actually starts and Vs comes up normally, so probably the powersupply is ok.
Probably the fault is in the SSB, since it's even not possible to get the set into Service Default Mode.

[PowerAmpFreak]

Re: Philips Plasma 50PF7320/10 worth anything?

Talked to the owner before me and he said the first thing that happened with this TV was that the sound was gone. After some time (days / weeks) it refuse to start up which is the state today.
The powersupply had two caps 3300uF/10V bad, which is for +3V3 supply to SSB. If those are bad could this lead to failure of the SSB eventually?
I know this is hard in depth questions, which probably only can be answered by someone very familiar with this TV set, like a Philips repair tech or so.
Wizard, are you around? Do you have any input to this problem?

[ifr500]

Re: Philips Plasma 50PF7320/10 worth anything?

I have the 42 inch version with sound and a dim glow for a picture.
Going by the service manual i tried to access SDM by shorting the jumper and as you found it doesn't work.
Currently have the SSB out will report back if any faults found.

[PowerAmpFreak]

Re: Philips Plasma 50PF7320/10 worth anything?

Interesting info.
When your set is in standby, does the led blink like 7 seconds on and 7 seconds off? Or is it constantly on? The service manual tells rather fuzzy stuff about the standby led. My set does the above blinking sequence.
I suspect that if the I2C bus is corrupt somewhere, the SDM doesn't work either. I haven't yet measured on the SCL and SDA lines for the I2C bus if there's any activity or not. All I know is that both lines are at 3,3V.
Could you check if your set respond to SDM by remote?
Press 062596 & MENU in a fast sequence.
If it enters, the set should begin flashing error codes.

[ifr500]

Re: Philips Plasma 50PF7320/10 worth anything?

I don't have a remote for this unit as yet.
My led is solid red in standby.
Trying to find my universal remote it's here somewhere.

[ifr500]

Re: Philips Plasma 50PF7320/10 worth anything?

I've just found this site with plasma training manuals on it.
Hopefully it may be of some use to the group.
http://www.my.electronicshelponline.com/Philips_61.html

[PlainBill]

Re: Philips Plasma 50PF7320/10 worth anything?

I've just found this site with plasma training manuals on it.
Hopefully it may be of some use to the group.
http://www.my.electronicshelponline.com/Philips_61.html

Thanks.

PlainBill

[PowerAmpFreak]

Re: Philips Plasma 50PF7320/10 worth anything?

Very good manuals, ifr500
I'm "kind of sure" that the powersupply is operating ok, since the red protect led on the psu board does not flash anytime.
Also, when I did deattach the power supply connector to SSB from PSU the powersupply started up ok, both green leds on, Vs 200VDC and it didn't turn itself off. I didn't dare to operate it this way a long time, just like half a minute or so.
As soon as SSB re-attached the powersupply is forced in standby 2 seconds after plugging it to mains, and this must be SSB doing this.
I remember an old Sony back projection TV which also according to the service manual output blinking led error codes, but the manual also mentioned that if the I2C bus were blocked in some way, the led would just blink without any error code, just like this TV does. That's why I believe this can be the case even with this TV.
Without having any evidence for it, I suspect the "Hercules" chip to be defective. This chip includes most of the audio functions and is the system microcontroller. Since the audio failed first, and then the set didn't want to start up, this chip is a "hot" thred, from my point of view.

[PowerAmpFreak]

Re: Philips Plasma 50PF7320/10 worth anything?

This is weird, isn't it.
I again read the service manual how to get into SDM. There's a detail I forgot to do earlier. After shorting SDM jumper and apply mains, you should press MAINS switch side button aswell.
When I did this, the standby led went to continous on, just like it should be in standby mode. After this I pressed, I can't remember if I pressed MAINS again or CH+, anyhow the set went into operation and displayed a great picture.
Though, there is some problem with the sound, there are just short bursts coming out of the speakers, volume dependent.
When pressing MAINS again, the set goes into standby (continous standby led).
So, WHY did the standby led blink 7 seconds on, 7 seconds off before?
Could this actually be a POWER SAVE mode, which must be quit by pressing MAINS button. The user manual is very short in this, but it do tell that the set "contains" circuitry that makes power consumption less then 1 Watt in this mode.

[PlainBill]

Re: Philips Plasma 50PF7320/10 worth anything?

This is weird, isn't it.
I again read the service manual how to get into SDM. There's a detail I forgot to do earlier. After shorting SDM jumper and apply mains, you should press MAINS switch side button aswell.
When I did this, the standby led went to continous on, just like it should be in standby mode. After this I pressed, I can't remember if I pressed MAINS again or CH+, anyhow the set went into operation and displayed a great picture.
Though, there is some problem with the sound, there are just short bursts coming out of the speakers, volume dependent.
When pressing MAINS again, the set goes into standby (continous standby led).
So, WHY did the standby led blink 7 seconds on, 7 seconds off before?
Could this actually be a POWER SAVE mode, which must be quit by pressing MAINS button. The user manual is very short in this, but it do tell that the set "contains" circuitry that makes power consumption less then 1 Watt in this mode.

Well, you are making progress. And troubleshooting the sound problem should be easier than video problems.

PlainBill

[PowerAmpFreak]

Re: Philips Plasma 50PF7320/10 worth anything?

The picture part of this plasma seems ok now.
I can't tell why it made the slow blinking standby led sequence, more than something went nuts when the 3300uF/10V caps were bad. Now they're replaced and everything seems fine.
I also got into the SDM by remote sequence, working hours 9600. Is this excessively much for a set from 2006?
And about the sound problem, everything's ok up to the class D audio amplifier, it's a cheap self oscillating design on a separate pcb. Headphone output is ok since it's driven by a separate lowpower amp.
Since I don't need any sound from the plasma itself I removed the poweramp pcb, and the set works fine without it aswell.
I also thought to install one or two small fans inside to cool YSUS and ZSUS, using the "unused" audio poweramp supply lines.
This might increase the lifetime of the power components.
So, people, it seems I've got my own 50" plasma ready for work!

[dmitt25]

Re: Philips Plasma 50PF7320/10 worth anything?

Don't know if this helps or will steer you off course because I can't find it now, but I read somewhere in the manual that any voltage detected in the lines to the speakers would cause the TV to go into protect.

Look around in your manual for that blurb.

Sorry I can't be more specific.

Edit: nevermind.. didn't read that last entry where you said you disabled the sound altogether.

Glad you got it going!

[PowerAmpFreak]

Re: Philips Plasma 50PF7320/10 worth anything?

Earlier today I got powersupply protect mode (11 flashes from a led on the psu board). This means DC-Protection (speakers) so probably is the class D output IC bad. But I'm not going to spend more time on that.
Who needs the internal speakers anyway?

[ifr500]

Re: Philips Plasma 50PF7320/10 worth anything?

Well done PowerAmpFreak !!!
I need to get the cro out and start checking for drive waveforms on my plasma.
That is when i get time

[PowerAmpFreak]

Re: Philips Plasma 50PF7320/10 worth anything?

Today I finalized the work on my plasma. I added 3 small fans together with a homebrew variable speed fan driver. See pictures.
One fan is blowing against Y-SUS, one fan to Z-SUS and one to logic board/SSB compartment. The speed is variable by a trimmer which is accessible through the upper part of the backplate.
If I get the air to move inside, I hope it will last a little longer.
Power for the fans is taken from the audio amp supply, since I removed the amp pcb.
Thanks everyone for help and advice!

[nikil511]

Re: Philips Plasma 50PF7320/10 worth anything?

Hello :-)
I also have the same plasma screen, (50PF7320/10) with a major display problem. (see image attached)

I do have knowledge of electronics, micro-controllers,etc.. can use an oscilloscope if required, but have never repaired a Plasma screen before :-( so I really dont know where to start !

I have download the repair manual and the training manual.

I dont see any exploded caps, or other components really worn :-(
Which are the "common suspects" caps you are talking about ?

Any help is seriously really appreciated !

Thanks
Manolis from Greece

[Th3_uN1Qu3]

Re: Philips Plasma 50PF7320/10 worth anything?

Today I finalized the work on my plasma. I added 3 small fans together with a homebrew variable speed fan driver. See pictures.

Umm, don't the little buggers get noisy? Some real class would be replacing that trimmer with a thermistor.

[epod]

Re: Philips Plasma 50PF7320/10 worth anything?

hay guys got the exact same problem on my tv same model opened it up and found bulged caps are they hrad to do help

[Plasma]

Re: Philips Plasma 50PF7320/10 worth anything?

Can anyone send me the shop manual for this? I tried the link, and the RAR file seems to be corrupt. Is there a place on the internet to download?

Thanks.

[Plasma]

Re: Philips Plasma 50PF7320/10 worth anything?

I am going to pick up some caps, but does anyone know what tolerance I need to get, and temp range? The original caps say 105c on them for temp. But is there low range?

thank you.