LG bh9530tw home theater no power

[R_J]

Re: LG home theater no power

So what exactly is wrong with YOUR power supply, maybe we can figure it out. Post a picture and list what parts you have found that are defective so far.

[Rain0989]

Re: LG home theater no power

No

[budm]

Re: LG home theater no power

Did you try PM DJKRISH to see if he can upload the schematic?

[Rain0989]

Re: LG home theater no power

push

[Rain0989]

Re: LG home theater no power

push

[Rain0989]

Re: LG home theater no power

Maybe if you posted the service manual with smps schematic (post#8) others could help.

Yes this would be nice

[R_J]

Re: LG home theater no power

Maybe if you posted the service manual with smps schematic (post#8) others could help.

[DjKrish]

Re: LG home theater no power

Nope still no luck as i couldn't fix the power.

[Rain0989]

Re: LG home theater no power

Push

[Rain0989]

Re: LG home theater no power

Push

[Rain0989]

Re: LG home theater no power

Hey

I have the same sound system with same problem --> NO POWER

Can you tell me what you have replaced?

Perefctly with the voltages and Amperes from the SMDs that you have changed.

best regards

[DjKrish]

Re: LG home theater no power

Remove as much of that yellow glue as possible because it becomes conductive when aged.

All removed. I couldn't turn on the unit. Its stuck at standby. Then later on after a few minutes upon checking all voltages, the standby light vanished as well. Checked for voltages again, noticed all voltages from the psu is reducing drastically with load. If i power on without load, the voltages are stable.

[Sparkey55]

Re: LG home theater no power

Like it stated in the smps, the same power supply is used in various models such as BH7xxx, BH8xxx, BH9xxx and DH7xxx. Does anyone has any service manuals for any of the said models?

Remove as much of that yellow glue as possible because it becomes conductive when aged.

[DjKrish]

Re: LG home theater no power

I did not look at the schematics yet but I wonder if those Voltages may not be ref. to the circuit common GND.

Im sorry i dont get u budm.

[DjKrish]

Re: LG home theater no power

Optocoupler PC903 (transistor) may be open circuit, it connected to the blown parts and controls voltage regulation.

All 3 Optocouplers has been replaced

[redwire]

Re: LG home theater no power

Optocoupler PC903 (transistor) may be open circuit, it connected to the blown parts and controls voltage regulation.

[DjKrish]

Re: LG home theater no power

Some of the joints on T901 look suspect at least from the photo you provided.

That was when i first took it out. Its all soldered already. Now the board is all good. Just wanted to verify the mismatch of voltages. Dont wanna end up blosing things again. Thats why i dont dare operate the unit yet. For now, i know the power light is there. So there is standby present.

[mmartell]

Re: LG home theater no power

Some of the joints on T901 look suspect at least from the photo you provided.

[DjKrish]

Re: LG home theater no power

I did not look at the schematics yet but I wonder if those Voltages may not be ref. to the circuit common GND.

Hi budm, heres the service manual that has the exact same smps. Pls check and tell me what u think.

[budm]

Re: LG home theater no power

I did not look at the schematics yet but I wonder if those Voltages may not be ref. to the circuit common GND.