LG bh9530tw home theater no power

[Rain0989]

Re: LG home theater no power

Thank you I will Change the capacitors and write then again here

[Rain0989]

Re: LG home theater no power

I have ordered now 3 new low esr Capacitors.

C909 and C936 are 50V 22u and the C919 is 50V 47u.

When they are here i will replace them and write here again.

[Rain0989]

Re: LG home theater no power

SO i have the capacitors here and changed. But still no standby or anything. Almost dead....

[Khron]

Re: LG home theater no power

Start checking the silicon, then - diodes, to begin with.

[Rain0989]

Re: LG home theater no power

With silicon you mean the yellow glue ? And which diodes?

Best regards

[Khron]

Re: LG home theater no power

https://en.wikipedia.org/wiki/Silicon

"Not to be confused with the silicon-containing synthetic polymer silicone."

https://en.wikipedia.org/wiki/Silicone

Start with the ones on the secondary side, connected to that transformer. Then the ones on the primary side.

[Rain0989]

Re: LG home theater no power

https://en.wikipedia.org/wiki/Silicon

"Not to be confused with the silicon-containing synthetic polymer silicone."

https://en.wikipedia.org/wiki/Silicone

Start with the ones on the secondary side, connected to that transformer. Then the ones on the primary side.

Here is another picture. Which ones you mean?

[Khron]

Re: LG home theater no power

D925, d922, d923, d924, d926, d905, d904, d901

[R_J]

Re: LG home theater no power

What are the voltages that you measure on CN901:
pins 5,6
pin 8
pin 9,10
pin 13,14

Is there any voltage on CN902 pins 1,2,3

[Rain0989]

Re: LG home theater no power

What are the voltages that you measure on CN901:
pins 5,6
pin 8
pin 9,10
pin 13,14

Is there any voltage on CN902 pins 1,2,3

pin 1 = 8,3
pins 5,6 = 0
pin 8 = 0
pin 9,10 = 0
pin 13,14 =1,6 & 1,6

[Rain0989]

Re: LG home theater no power

D925, d922, d923, d924, d926, d905, d904, d901

I tested the diodes with my multimeter. d922, d923 are faulty. The others are OK.

Which values have d922, d923 ? When i know this i can buy 2 new ones.

[R_J]

Re: LG home theater no power

What are the numbers on the diodes, they should have numbers printed on them.

[Khron]

Re: LG home theater no power

Precisely on the voltage rail that the feedback is taken from. No wonder the thing won't start

I tested the diodes with my multimeter. d922, d923 are faulty. The others are OK.

Which values have d922, d923 ? When i know this i can buy 2 new ones.

[Rain0989]

Re: LG home theater no power

what are the numbers on the diodes, they should have numbers printed on them.

d922 & d923 = pj5016 br210

[Rain0989]

Re: LG home theater no power

Precisely on the voltage rail that the feedback is taken from. No wonder the thing won't start

?

[R_J]

Re: LG home theater no power

PJ5016 Br210 I believe PJ= Panjit 5016= date code

[Rain0989]

Re: LG home theater no power

PJ5016 Br210 I believe PJ= Panjit 5016= date code

I have ordered them and change the two diodes and write here again

[JOMISERVICE]

Re: LG home theater no power

Here is the sch you need
https://drive.google.com/file/d/11YR...ew?usp=sharing

[Rain0989]

Re: LG home theater no power

Thank you all guys

After changing the two diodes D922 & D923 the theatre is fully working

[Khron]

Re: LG home theater no power

Glad to hear that!