Sony KDL-32BX300

[dcapper]

Been working on this tv for a while and I am stumped. I have no power, no standby light but power on the power supply from what I can see but one pin is confusing me.

According to the schematic CN6401 is as follows:

1 - Standby 3.3v (I have 3.3v)
2 - AC Off Detect ( I have OL)
3 - Power On (I have 3.3v)
4 - Audio 12v (I have 12.8v)
5 - AudioGnd (I have Gnd)
6 - Reg 12v Gnd (I have Gnd)
7 - Reg 12v Gnd (I have Gnd)
8 - Reg 12v (I have 12.8v)
9 - Reg 12v (I have 12.8v)
10 - BL Err (I have OL)
11 - BL On (I have 1.3v)
12 - Dimmer (I have OL)
13 - NC
14 - T-Con VCC 12v (I have .29v)
15 - T-Con On (I have 1.8v)

The schematic I have doesn't list the voltages so I have to assume they ok. Pins 11 and 15 I assume they are just triggers hence the lower voltage. The one that concerns me the most is pin 14. I would think it should be 12v. Now should I remove the wire from the harness and put it to 12v to see if the T-Con turns on? Or does that power come from the A board? I tried another similar working power supply that had the same power outputs but the inverter connector was different so it was disconnected.

I don't know at this point if it's the A or P board. I thought when the A board is faulty, you would still get the standby light on the chassis?

[anmol]

Re: Sony KDL-32BX300

here u need apro. 3.3 volt.

2 - AC Off Detect ( I have OL)

15 - T-Con On (I have 1.8v)

wbr

[dcapper]

Re: Sony KDL-32BX300

here u need apro. 3.3 volt.

2 - AC Off Detect ( I have OL)

15 - T-Con On (I have 1.8v)

wbr

Thanks. Now is this an A board problem or a P Board problem?

[budm]

Re: Sony KDL-32BX300

Service manuals:
http://elektrotanya.com/?q=showresul...oria=&kat2=all
BTW, the ones with OL (Over range) readings, you should move the Voltage scale up so we can see what the voltages really are.

[dcapper]

Re: Sony KDL-32BX300

I have the service manual but it doesn't list the voltages. My Fluke is auto ranging so I can't adjust. The meter's setting is automatic between voltage and resistance. So if it sees no voltage it looks for resistance. I have another Fluke I can meter with though. From what I can see from the schematic, I'm thinking it's the A board.

[budm]

Re: Sony KDL-32BX300

Even the meter is in auto range, it could not have gone higher than 12VDC.

[dcapper]

Re: Sony KDL-32BX300

Even the meter is in auto range, it could not have gone higher than 12VDC.

I think on this meter OL just means open loop. So there's probably no voltage and no short to ground.

[budm]

Re: Sony KDL-32BX300

No voltage would have shown 0 V on the screen, so I am not sure what you are seeing.

[dcapper]

Re: Sony KDL-32BX300

Its just the way the meter was designed. The voltage and resistance setting are the same. The meter auto decides what it is reading. I have two other flukes I can read with when I get home. Since Amnol said pin 2 and 15 should have 3v, I'm thinking the A board is not sending it to turn the tv on.

I'm wondering if I should pull the ac off detect pin from the harness on the P board then put a jumper to 3.3v to it and see if the power turns on?