Panasonic SA-HT820V Home Theater System

[Diah]

Re: Panasonic SA-HT820V Home Theater System

My post #5 i wrote its mechanic issue and need to put all at zero point.

yours display photo its tell same you have Order JAM ( because the lost of zero point and there are 2 or more micro switch sending order.) though this can damage the main IC. not C or R.

[R_J]

Re: Panasonic SA-HT820V Home Theater System

I was referring to L7200, it read 4.94

For P1102 read

Pin 2 - 0
3 - 13
4 - 3.3
5 - -17.7
6 - - 23.7
11 - 6
12 - 6
All other pins are ground or he -+.

Haven't located Q3306 yet but some of those voltage reading seem low.

4.94 what?
P1102 pins 3&4 are the same connection, how can you have 2 different voltages? You must be reading the pins wrong. Check the voltages on the test points TL10xx instead. IP1240 is a fuse, check if it is still good.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

So apparently it's under the board, or at least the label is. I knew that! What am I checking? Because Im not seeing those letters anywhere.

And where online did you find the schematics for it?

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

Define "it" Yes the VCR needs to be plugged in, and Yes the connector needs to be connected to check for the +5 volts.
In sch11_14 (Pg3) , you will see Q33006, it is the 5V_vcc regulator, check the voltage on E,B & C.
sch27 has the power supply, check the voltage on P1102, are all the voltages their?
The blue stiff plastic being pulled away from the white flat cable is not a problem, the blue piece is to stiffen the cable to make insertion easier. You need to be careful with these cables or you will continue to damage them.

I was referring to L7200, it read 4.94

For P1102 read

Pin 2 - 0
3 - 13
4 - 3.3
5 - -17.7
6 - - 23.7
11 - 6
12 - 6
All other pins are ground or he -+.

Haven't located Q3306 yet but some of those voltage reading seem low.

[R_J]

Re: Panasonic SA-HT820V Home Theater System

I found L7200 and not getting a reading. Newb question, is it suppose to be plugged in and connected when checking it?

Define "it" Yes the VCR needs to be plugged in, and Yes the connector needs to be connected to check for the +5 volts.
In sch11_14 (Pg3) , you will see Q33006, it is the 5V_vcc regulator, check the voltage on E,B & C.
sch27 has the power supply, check the voltage on P1102, are all the voltages their?
The blue stiff plastic being pulled away from the white flat cable is not a problem, the blue piece is to stiffen the cable to make insertion easier. You need to be careful with these cables or you will continue to damage them.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

Does the display board have a flat ribbon cable going off to another board. If it has I would check the gold contacts at both ends.

I don't know what to say... You can use the ohm setting on its lowest scale, when you short the probes together, that is what a short would look like, 0 ohms (or close to 0) You likely shorted something and are missing a critical voltage or you blew the display driver Try and find out what created the burning smell. It was working (sort of) before so it is something you did, so go over everything that you removed or unplugged.
Check thatyou did'nt damage the cable P7201 between the display board and the main dvd interface. Can you locate L7200 on the display board? it should have +5volts on it

Download the service manual

The cable from the display was my first guess since I forgot to unplug it several times when taking off the front and it would yank it. It was pushed up a bit at one end but I pushed it back down. The othes side tore off a bit tho because of the angle in which its bent to connect. The end that connects to the board looks fine.

I found L7200 and not getting a reading. Newb question, is it suppose to be plugged in and connected when checking it?

[R_J]

Re: Panasonic SA-HT820V Home Theater System

Oh, looked like othep pics of leaky caps. Right, I just thought it looked like it needed to be replaced. So besides visually, how do you check for a short with a multimeter?

I don't know what to say... You can use the ohm setting on its lowest scale, when you short the probes together, that is what a short would look like, 0 ohms (or close to 0) You likely shorted something and are missing a critical voltage or you blew the display driver Try and find out what created the burning smell. It was working (sort of) before so it is something you did, so go over everything that you removed or unplugged.
Check thatyou did'nt damage the cable P7201 between the display board and the main dvd interface. Can you locate L7200 on the display board? it should have +5volts on it

Download the service manual

[dick_barton]

Re: Panasonic SA-HT820V Home Theater System

Does the display board have a flat ribbon cable going off to another board. If it has I would check the gold contacts at both ends.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

That is glue, the cap is not leaking, even if it was bad it would not cause the display to be like it is.

Oh, looked like othep pics of leaky caps. Right, I just thought it looked like it needed to be replaced. So besides visually, how do you check for a short with a multimeter?

[R_J]

Re: Panasonic SA-HT820V Home Theater System

I didn't notice anything visually, but I found a leaky cap on the power board.

That is glue, the cap is not leaking, even if it was bad it would not cause the display to be like it is.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

I didn't notice anything visually, but I found a leaky cap on the power board.

[R_J]

Re: Panasonic SA-HT820V Home Theater System

I don't believe this was there before.

Yes it was, that is the getter for the fl display, The display itself is working or you would have nothing lit up at all, it is the drive to it that is messed up, either the misplay micro or its missing a voltage. Try and find out what burnt, There must have been something assemble wrong or something.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

I don't believe this was there before.

[R_J]

Re: Panasonic SA-HT820V Home Theater System

That is a different type of mode switch, the top piece rotates and pushes the switch fingers down to make contact, so the place where they make contact needs to be cleaned. As for the display, I have no idea but it looks like you did something, I suspect you shorted something while working on it. maybe you damaged another flat cable? Recheck your work, I suspect something with the front panel got damaged.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

I put everything back together and plugged it in. It turned on and ejected the tape but now the screen looks like this lol. There was an odor when it started up like something blew.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

That is just a ground wire, it goes under that missing screw, see this picture. Sometimes you can just pop the top part of the mode switch off, It is held in place by 4 little tabs but to get to them you need to remove the board from the vcr plastic case. Once it is open you can use an eraser or q-tip to clean the contacts or better is a fiberglass burnishing brush. then I re apply the contact grease.
If the switch has grease in it, try and salvage it, clean the contacts, then reapply it just to coat the lower contacts to prevent them from oxidizing.

Here is a video of a guy cleaning a similar mode switch https://www.youtube.com/watch?v=X2HXUaLe2vI (starts at about 6:00)

Looks clean already but I took an eraser to it. Took some grease from another part and applied it.

[R_J]

Re: Panasonic SA-HT820V Home Theater System

That is just a ground wire, it goes under that missing screw, see this picture. Sometimes you can just pop the top part of the mode switch off, It is held in place by 4 little tabs but to get to them you need to remove the board from the vcr plastic case. Once it is open you can use an eraser or q-tip to clean the contacts or better is a fiberglass burnishing brush. then I re apply the contact grease.
If the switch has grease in it, try and salvage it, clean the contacts, then reapply it just to coat the lower contacts to prevent them from oxidizing.

Here is a video of a guy cleaning a similar mode switch https://www.youtube.com/watch?v=X2HXUaLe2vI (starts at about 6:00)

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

It could be (very likely) that the mode switch contacts need cleaning, the can be opened and cleaned.

How do you open it? Just pull it up?

And what is this part? It keeps coming off and it was off when I was testing it with the tape.

[R_J]

Re: Panasonic SA-HT820V Home Theater System

It could be (very likely) that the mode switch contacts need cleaning, the can be opened and cleaned.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

Have you tried loading a tape to see if it turns on? There may be a problem with the power button command not getting to the main micro, ie: another cable issue?

I just put one and the VCR side turned on and then I pressed play and it didn't do anything. I pressed eject, ejected it about halfway and then took it back and now it's saying F06.