715g6338+psu.

[dick_barton]

Re: 715g6338+psu.

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

Here is the manual

[steinless]

Re: 715g6338+psu.

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

I probably need to get some parts... What do you reckon I might need to test and stuff say 5 ten steps down... If it takes so long... I can get them all first...

Thanks!

[dick_barton]

Re: 715g6338+psu.

You just need a few 1K ohm resistors to carry out most tests.

[nomoresonys]

Re: 715g6338+psu.

Here is the manual

Are you sure that's the right one? I don't see Cn9301

[dick_barton]

Re: 715g6338+psu.

You are correct. I was looking at two psu schematics at the time and posted the wrong one.

[steinless]

Re: 715g6338+psu.

I assume this is correct? Don't mind the lousy soldering...

If it's correct I get a 1 v spike that subsides on the 36 24v sides

[dick_barton]

Re: 715g6338+psu.

With the mainboard still disconnected and the resistor still in place what voltage do you have when you put your meter leads across ZD9330 and power up out of standby?

[steinless]

Re: 715g6338+psu.

I need to clarify. When you mean mainboard you mean the second pic which connects to the screen and stuff ya.

And when you mean bring it out of standby I connect the ancillary items from the cable in the first pic ya? And I turn on the remote yes?


When tested with no connection, I get .05v

When tested with the ancillary connection similar. Sometimes it goes to .07.

When I turn on the remote it goes to 15v.

[dick_barton]

Re: 715g6338+psu.

Post a picture of the back of your set showing all the circuit boards.
To confirm. You have 15V across ZD9330 when you use the remote to come out of standby, yes?
If so it looks like the PS_ON is switching on transistor Q9333 to supply VCC_ON (15V) to IC9801 and IC9101
What is the voltage now across C9812. It was about 300V but should be approx 380V


With the set off check the resistance of R9107 and R9815 and please give results

[steinless]

Re: 715g6338+psu.

R9107 2.5ohm
R9815 2.5 ohm

C9812 is now 400v

Yeap I have 15V across ZD9330 when I use the remote

[dick_barton]

Re: 715g6338+psu.

So the boost circuit IC9801 is working.

Do you now have the +36V/+24V ?

Boards pic layout

[steinless]

Re: 715g6338+psu.

Nope still no 36/24.

Doesn't matter if ii pluck in the main board or not, its the same.

So you don't need the cable circled in red too ya?

[dick_barton]

Re: 715g6338+psu.

You do not want the mainboard connected to the power supply when carrying out checks on the power supply to avoid damaging the mainboard.

It looks like you have a faulty IC9101 or a component around that IC is faulty. Perhaps as you initially thought the transformer T9101, although it would be unusual.

With the set still powered off what is the resistance from the +36V/+24V line to ground. Can you also check the resistance of D9104 with your meter set to diode mode.

With the set powered off you can measure the resistance of the transformer.
Pin 1 - 2 =
Pin 3 - 4 =
Pin 3 - 5 =
Pin 4 - 5 =
They should all be very low resistance.