LG bh9530tw home theater no power

[DjKrish]

Re: LG home theater no power

Ok time for updates. Have changed all the faulty components. Power is up. Theres standby light on the home theater BUT i measured the voltages on the power board, the voltages on all the pins seems higher than rated as i checked using MM on DC mode. Now thats weird. Check screenshot

Upon measuring using MM on DC mode, these are the voltages im getting

3.8VA im getting 9.3VA
6VA im getting 13.7VA
14VA im getting 31.8VA

[DjKrish]

Re: LG home theater no power

I can't be 100% sure from the first photo, but it kinda looks like most of the components between the PWM chip and the MOSFET gate are toast.

http://omapalvelin.homedns.org/tesla...fets-large.gif

T2 = Q912
T3 = Q913
D2 = D913, with R948 added in series with it
R17 = R907, in parallel with the series'd D913/R948

ZD905 added to limit the max voltage going to the MOSFET gate; FB903 in series with the gate, to prevent high-frequency interference from affecting the gate.

Odds are good the PWM chip is gone as well. Can you still read the markings on it?

Didnt realise that LG service manuals are really hard to find. Sighs. Thank god manage to get the manual for DH series that uses the same smps. Now i have identified all the components

[Khron]

Re: LG home theater no power

I can't be 100% sure from the first photo, but it kinda looks like most of the components between the PWM chip and the MOSFET gate are toast.

http://omapalvelin.homedns.org/tesla...fets-large.gif

T2 = Q912
T3 = Q913
D2 = D913, with R948 added in series with it
R17 = R907, in parallel with the series'd D913/R948

ZD905 added to limit the max voltage going to the MOSFET gate; FB903 in series with the gate, to prevent high-frequency interference from affecting the gate.

Odds are good the PWM chip is gone as well. Can you still read the markings on it?

[DjKrish]

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?

[DjKrish]

Re: LG home theater no power



SMPS model is EAX63689124

Can anyone pleaseeeeeeeee help me get the service manual for this model?

[DjKrish]

Hi folks, im in need of service manual for this model. Any kind soul able to upload the service manual for me? The model is LG bh9530tw

Few of the smd components burned at the bottom