Sony SMD-HS73

[retiredcaps]

Re: Sony SMD-HS73

Also, the two voltage regulators on the logic board.The 1.8V chips bounces between 1.09V and 1.24V when left on. When turned off, it goes immediately to 2.35V and gradually works it way up to 2.48V and stays steady there. When turned on it goes to 1.17V for a second or two before bouncing between the 1.09V and the 1.24V.

I'm a bit confused and it is almost 1am in the morning, but back in post #9, the regulators were identified as 1086D25 a 2.5V regulator and BA033 a 3.3V regulator. Where did 1.8 come from?

[alexanna]

Re: Sony SMD-HS73

Voltages at the on/off pin are the same as before at CN1.

Checking the Enable voltage from the oz960, I'm getting 1.17V for off, then frequent drops to about .5V.

Should I be looking between pin 3 for U1 and the on/off location at CN1 for possible bad components? Or should I consider getting a replacement oz960?

Also, the two voltage regulators on the logic board. 3.3V seems to be pretty close to that. When on, a steady 3.34V when off steady 3.37V. The 1.8V chips bounces between 1.09V and 1.24V when left on. When turned off, it goes immediately to 2.35V and gradually works it way up to 2.48V and stays steady there. When turned on it goes to 1.17V for a second or two before bouncing between the 1.09V and the 1.24V.

The 1.8 volt regulator may be a problem,
I am going to ask for help on it, let's see what the other guys say
Al

[torin3]

Re: Sony SMD-HS73

I think you are going to find a problem with the logic board. Could you re check the voltages on the on off pin at CN1?
If you look at page 2 of the data sheet of the oz960 the enable or the on off voltage is 2 to 3.3volts when on.[you have to lay your head on your left shoulder to read it].
I think I would also take a closer look at the voltage regulators on the logic board, monitor the output voltages as you power the monitor on and do it several times.
I really don't know if this is the answer it's just something to try.
Al

Voltages at the on/off pin are the same as before at CN1.

Checking the Enable voltage from the oz960, I'm getting 1.17V for off, then frequent drops to about .5V.

Should I be looking between pin 3 for U1 and the on/off location at CN1 for possible bad components? Or should I consider getting a replacement oz960?

Also, the two voltage regulators on the logic board. 3.3V seems to be pretty close to that. When on, a steady 3.34V when off steady 3.37V. The 1.8V chips bounces between 1.09V and 1.24V when left on. When turned off, it goes immediately to 2.35V and gradually works it way up to 2.48V and stays steady there. When turned on it goes to 1.17V for a second or two before bouncing between the 1.09V and the 1.24V.

[alexanna]

Re: Sony SMD-HS73

Off = .12V
On = .14V
Light on, hard to tell with my slow meter, but it looks like close to 5V.

I think you are going to find a problem with the logic board. Could you re check the voltages on the on off pin at CN1?
If you look at page 2 of the data sheet of the oz960 the enable or the on off voltage is 2 to 3.3volts when on.[you have to lay your head on your left shoulder to read it].
I think I would also take a closer look at the voltage regulators on the logic board, monitor the output voltages as you power the monitor on and do it several times.
I really don't know if this is the answer it's just something to try.
Al

[torin3]

Re: Sony SMD-HS73

Try measuring the same points using a different ground. If you get a voltage on pin 2, I either guessed wrong on what Q7 is or it may be defective.

Same readings using a ground point near CN1.

Ground to pin 2 is 0.00VDC.

[jetadm123]

Re: Sony SMD-HS73

Pin 1 to 2 = 4.39 VDC
Pin 3 to 2 = 1.17VDC with lamp off, up to 5.7VDC with lamp on.

Try measuring the same points using a different ground. If you get a voltage on pin 2, I either guessed wrong on what Q7 is or it may be defective.

[alexanna]

Re: Sony SMD-HS73

This inverter controller has been discused look at the last 2 posts.
No fix was listed but an explantion of how the oz960 works.
https://www.badcaps.net/forum/showth...ighlight=oz960
Al.

[torin3]

Re: Sony SMD-HS73

I could be wrong, but Q7 may not be a transistor, but some sort of voltage detector. Referring to spec sheet, pin1=5V and pin3=4.2V. Try measuring for these voltages.

Pin 1 to 2 = 4.39 VDC
Pin 3 to 2 = 1.17VDC with lamp off, up to 5.7VDC with lamp on.

[jetadm123]

Re: Sony SMD-HS73

I could be wrong, but Q7 may not be a transistor, but some sort of voltage detector. Referring to spec sheet, pin1=5V and pin3=4.2V. Try measuring for these voltages.

[retiredcaps]

Re: Sony SMD-HS73

The one labeled Q7 on the top of the board. Markings are S 7142 (something that might be 11, II, H, or something else)2.

For transistors (Q), I like to test them for shorts using resistance.

Test pin 1-2, 1-3, 2-3. Any reading under 30 ohms suggests it is shorted.

[torin3]

Re: Sony SMD-HS73

Which diode are you testing above?

The one labeled Q7 on the top of the board. Markings are S 7142 (something that might be 11, II, H, or something else)2.

[retiredcaps]

Re: Sony SMD-HS73

Edit: using diode check (first number from the HHM95 meter, second from the Craftsman meter)
Black 1 Red 2 = .294 - 253
Red 1 Black 2 = .526 - 608
Black 3 Red 2 = .578 - 626
Red 3 Black 2 = 1.137 - out of range

Which diode are you testing above?

[torin3]

Re: Sony SMD-HS73

Also, I'm having luck tracing that 5V line from U1. Though a 22ohm resistor at R13, and then through a 10kohm resistor at R15. Though a few jumpers until I get to transistor Q7 on the main side.

Ok, I must be tired. For some reason I can't retrace this again. I get lost. I found another pcontinuity path, but I get stuck at a component 2D3, marked KZP, and then at 90° in smaller letters P7.

Edit 1:Ok, I figured out how I got to Q7. Though there are several paths that get me to small surface mounted components that look like transistors of some type.

I'll try and mark up a photo of where I'm getting continuity.

Edit 2: Here is the photo.

[torin3]

Re: Sony SMD-HS73

It almost sounds like the 12V and 5V outputs have somehow combined to produce an intermittent 17V? When you soldered in the new caps at the 5V and 12V outputs, did you observe correct polarity? Check for any solder bridges between the solder pads and traces.

Yep, correct polarity observed. The bottom of the board has + & - signs at each point and the caps are correctly oriented. I usually check about 3-5 times to make sure I've got it lined up right before soldering. And I tend to remove 1 cap and replace it before removing the next so I can double check the silkscreen polarity designs relative to the other caps. Probably overkill, but I'd rather not get one in backwards.

Also, I'm having luck tracing that 5V line from U1. Though a 22ohm resistor at R13, and then through a 10kohm resistor at R15. Though a few jumpers until I get to transistor Q7 on the main side. I'm going to check in in a few second with my Omega HHM 95 DMM. The Crapsman DMM I'm using has a louder beep in continuity check mode, but I don't like how if you aren't in the right resistance range, it gives you bogus numbers, and it isn't always easy to tell when you are in the right band based off of it.

Edit: using diode check (first number from the HHM95 meter, second from the Craftsman meter)
Black 1 Red 2 = .294 - 253
Red 1 Black 2 = .526 - 608
Black 3 Red 2 = .578 - 626
Red 3 Black 2 = 1.137 - out of range

[jetadm123]

Re: Sony SMD-HS73

It almost sounds like the 12V and 5V outputs have somehow combined to produce an intermittent 17V? When you soldered in the new caps at the 5V and 12V outputs, did you observe correct polarity? Check for any solder bridges between the solder pads and traces.

[torin3]

Re: Sony SMD-HS73

Looks like D12 tests fine.

Ok. Putting it back in the board.

[retiredcaps]

Re: Sony SMD-HS73

1) red on pin 1, black on pin 2, 297
2) black on pin 1, red on pin 2, out of range
3) red on pin 3, black on pin 2, 297
4) black on pin 3, red on pin 2, out of range

Looks like D12 tests fine.

[torin3]

Re: Sony SMD-HS73

Another way to test this diode is to put your multimeter on diode test functionality.

Number the pins 1, 2, and 3.

1) red on pin 1, black on pin 2, 297
2) black on pin 1, red on pin 2, out of range
3) red on pin 3, black on pin 2, 297
4) black on pin 3, red on pin 2, out of range

[retiredcaps]

Re: Sony SMD-HS73

Another way to test this diode is to put your multimeter on diode test functionality.

Number the pins 1, 2, and 3.

1) red on pin 1, black on pin 2, record diode measurement
2) black on pin 1, red on pin 2, record diode measurement
3) red on pin 3, black on pin 2, record diode measurement
4) black on pin 3, red on pin 2, record diode measurement

[torin3]

Re: Sony SMD-HS73

Part is: STPS10150CT http://www.datasheetarchive.com/pdf-...SA-603609.html

Black on A1 to Red on
K = out of range
A2 = out of range
Top tab = out of range

Black on K to Red on
A1 = 144ohms
A2 = 144ohms
Top tab = .3ohms

Black on A2 to Red on
A1 = out of range
K = out of range
Top tab = out of range

Black on top tab to Red on
A1 = 144ohms
K = .3ohms
A2 = 144ohms