LG BH7530T Repairing

[kosmasgr84]

Good evening.
I own the LG BH7530T HOME THEATER in which, after an S-PROTECTION indicator and a thorough check on the boards of the device, I found that on the power supply board with serial number EAX63689122, there is a serious fault on SMD TRANSISTOR with number ZO905 which has been totally damaged. I provide some photos of it and the code of Power Board.
Is there any way to find the type of this SMD transistor ?
Thanks.

[lotas]

Re: LG BH7530T Repairing

ZD905 is a 16v zener diode. You mine and the resistors burned out too.

[kosmasgr84]

Re: LG BH7530T Repairing

ZD905 is a 16v zener diode. You mine and the resistors burned out too.

Thanks a lot , i will try to fix it

[kosmasgr84]

Re: LG BH7530T Repairing

ZD905 is a 16v zener diode. You mine and the resistors burned out too.

Hello again , could you help me about the type of resistors R907 R948. R950 and R915 please ?

[lotas]

Re: LG BH7530T Repairing

R907 - 22 Om
R948 - 4.7Om
R950 - 220 Om
R915 - 1kOm

[kosmasgr84]

Re: LG BH7530T Repairing

R907 - 22 Om
R948 - 4.7Om
R950 - 220 Om
R915 - 1kOm

Thanks a lot brother I found them.
This service manual saved my AMP

[lotas]

Re: LG BH7530T Repairing

Resistors don’t just burn out, most likely Q901, IC902, Q911, ... all components must be carefully checked and replaced with new ones, otherwise everything will burn out again.

[kosmasgr84]

Re: LG BH7530T Repairing

Resistors don’t just burn out, most likely Q901, IC902, Q911, ... all components must be carefully checked and replaced with new ones, otherwise everything will burn out again.

Thanks , I managed to fix the main power board. But Audio board has been damaged also. Actually it doesn't worth to fix it. Need to take off heat sink and check everything.
For now i bypassed audio board , so the amplifier works with the sound directly to TV through HDMI Arc.

Either I find a new or used audio board or a new amplifier which support 3ohms impedance to use at least the LG speakers.