715g6338+psu.

[steinless]

Have a Phillips TV. Schematic and picture shown above.

I managed to diagnose the hot side 300v DC seems fine.

Can't tell what's damaged.

I suspect it's t9101 or t9301.


Kind of rusty with all these any pro help would be appreciated!


Many thanks!

[steinless]

Re: 715g6338+psu.

Can't turn on, it just has a soft beeping sound when I try to turn it on.

[dick_barton]

Re: 715g6338+psu.

What voltage(DC) do you have with the meter leads connected to each leg of capacitor C9812 when you power up the set?

What voltages do you have on the 14 pins of CN9301

[steinless]

Re: 715g6338+psu.

I don't need to de solder the legs yea? It was 300 ish. I tested on c9815. On t9301 there is still 300ish on leg 1 and 5. Couldn't get a reading on t9101 though.

[steinless]

Re: 715g6338+psu.

On the cn9301 generally 300ish on input side except for 1_2. 5_3,4

The output side has no output. Sometimes when I try Ac it jumps to 5vac. But generally it's like 0. I was thinking if this one is turned on by the opamps?

[dick_barton]

Re: 715g6338+psu.

Can you measure the voltage on C9812. It's highly unlikely there is a problem with t9301 or t9001

[steinless]

Re: 715g6338+psu.

9812 is 300. Do I need to desolder?

[steinless]

Re: 715g6338+psu.

If you look at the t9101 it looks like there's some oil leaking out.

[dick_barton]

Re: 715g6338+psu.

Do you have 12V at CN9301 pin 9 and pin 11
What voltage do you have at CN9101 pin 1

[steinless]

Re: 715g6338+psu.

Let me retest

[steinless]

Re: 715g6338+psu.

I get the 12v side on the 9301. But how should I test 9101?I get weird readings and when I flip it over it looks like the ground is not all linked.

[steinless]

Re: 715g6338+psu.

I tested the middle parts on the flipped portion where they have the 36 24v all that stuff, don't get readings

[dick_barton]

Re: 715g6338+psu.

There is no boost voltage which should be around +380V across C9812.
You have 12V but the +24v/+36v supply is missing.

What voltage do you hace across C9320 when you switch on. This provides Vcc which is needed to switch on the other supplies.

[steinless]

Re: 715g6338+psu.

9320 is 20v dc

[dick_barton]

Re: 715g6338+psu.

That is good.
What is the voltage at PS_ON which is pin3 of CN9301 when in stanby and when out of standby.

[steinless]

Re: 715g6338+psu.

Hmm I couldn't get a reading. I assume you mean I have to assemble it back with the cables, then turn it on. The cables are too short for me to safely test it.

But I think it's about .5 standby 0.3 turned on with some beeping sound.

There are times when I short out some pins(not sure which) and I can see the backlight flip on monetarily.

I tried testing the on side row I get some sparks. I thought I better stop first...

[dick_barton]

Re: 715g6338+psu.

C9105 has been reported to be a problem on this model of power supply. Can you check that it is physically OK and not buldged or cracked.

If C9105 is OK then disconnect the mainboard from the power supply. Connect PS_ON to +12V using a 1K resistor. Power up (mainboard still disconnected) and check that the +36/+24V comes up

[steinless]

Re: 715g6338+psu.

Do you reckon there might be an easier way? I looked at c9105 it looked OK. Not bloated or anything.

Then I don't have a 1k resistor sitting around. Was thinking to Short the 12v with PS_ON but couldn't get it to work. Too.

[nomoresonys]

Re: 715g6338+psu.

Can you list the pin labels on CN9301? I can only see the on/off and dim from the picture.

[dick_barton]

Re: 715g6338+psu.

Do you reckon there might be an easier way? I looked at c9105 it looked OK. Not bloated or anything.

Then I don't have a 1k resistor sitting around. Was thinking to Short the 12v with PS_ON but couldn't get it to work. Too.

A resistor is used so that if you make an error it does not damage the power supply.