Panasonic SA-HT820V Home Theater System

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

200ma 200v would be the minimum, that -30v supply is fairly low current, so any fast recovery diode greater than 200ma/200v would work.

Ok, I'll get some and try it out. I appreciate your help so far.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

Got the part and soldered it. Nothing shows up on the display. It powers up tho because the vhs side starts up. The connector tape is fine.

[R_J]

Re: Panasonic SA-HT820V Home Theater System

And the voltage is?

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

And the voltage is?

Pin number 6 is reading .6V. All other pins are good.

[R_J]

Re: Panasonic SA-HT820V Home Theater System

Pin number 6 is reading .6V. All other pins are good.

Without -30 volts you won't get a display. To make sure there are no shorts on that line, CARFULLY remove the flat cable from P1102 and check if the negative -30v is on TL1030, if not, Unplug the unit and check the resistance of TL1030 to ground, it should be very high. Then as a last check, measure the transformer winding resistance It can be checked between D1270 cathode and ground (W56)

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

Didn't get -30 on TL1030.

TL1030 read 7.8 M Ohms
D1270 read 4.6 M Ohms

[R_J]

Re: Panasonic SA-HT820V Home Theater System

Didn't get -30 on TL1030.

TL1030 read 7.8 M Ohms
D1270 read 4.6 M Ohms

If D1270 cathode (white band) to ground measures 4.6M Ohms you either damaged a trace or the transformer winding is open.

[CapsDude]

Re: Panasonic SA-HT820V Home Theater System

If D1270 cathode (white band) to ground measures 4.6M Ohms you either damaged a trace or the transformer winding is open.

Any way to find out if it's either one of those?

[R_J]

Re: Panasonic SA-HT820V Home Theater System

Any way to find out if it's either one of those?

Nope, no way to tell