Hitachi 50HYT62U no picture

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Need to locate Voltage test points on those board and start checking Voltages. Start by looking for 12V input and the fuse.

I camt seem to locate any test points on the driver boards themselves, nor a fuse??

Thats not to say they arent any, its just everything is that small, and my eyes arent the greatest lol

[budm]

Re: Hitachi 50HYT62U no picture

Need to locate Voltage test points on those board and start checking Voltages. Start by looking for 12V input and the fuse.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

I do not expect any of those ceramics cap to show <100 Ohms.

There are quite alot less than 100 Ohms, so what would that indicate?

[budm]

Re: Hitachi 50HYT62U no picture

I do not expect any of those ceramics cap to show <100 Ohms.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

50 Ohms? 50 KOhms, 50 MOhms?
What is the Ohm scale set to and what is shown on the display of the meter?

Sorry, I set the meter to 200, and the readings are for example 95.6

[budm]

Re: Hitachi 50HYT62U no picture

So Ive tested all caps on those boards, they were all between 50 and 120

50 Ohms? 50 KOhms, 50 MOhms?
What is the Ohm scale set to and what is shown on the display of the meter?

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Always do resistance check when power is not applied, i.e. unplug the TV or what ever you are working on from any power source.
BTW. you do know how to replace SMD parts, correct?

Only SMD parts I have changed so far are backlight LEDs

[Bloopeta]

Re: Hitachi 50HYT62U no picture

So Ive tested all caps on those boards, they were all between 50 and 120

[nomoresonys]

Re: Hitachi 50HYT62U no picture

And sorry if this is a silly question, but do I test with power on or off? Or is that irrelevant?

Power off.

[budm]

Re: Hitachi 50HYT62U no picture

And sorry if this is a silly question, but do I test with power on or off? Or is that irrelevant?

Always do resistance check when power is not applied, i.e. unplug the TV or what ever you are working on from any power source.
BTW. you do know how to replace SMD parts, correct?

[nomoresonys]

Re: Hitachi 50HYT62U no picture

If you see any that are noticeably lower than the others you will know, last ones I measured were pretty much over 100 on 200 setting.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

All you have to do is to test the resistance of the caps.

Ah I see, thankyou, I will do it now and report back

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Put ur meter in ohm mode check and see if any read very low ohms, one probe on each side of cap, doesn't matter which way around.

And sorry if this is a silly question, but do I test with power on or off? Or is that irrelevant?

[budm]

Re: Hitachi 50HYT62U no picture

All you have to do is to test the resistance of the caps, it can also be applied to any kind of boards when troubleshooting the problem.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Put ur meter in ohm mode check and see if any read very low ohms.

Ill get onto it now any report back, what would be concidered normal readings and what would be concidered very low on these particular boards?

[nomoresonys]

Re: Hitachi 50HYT62U no picture

Put ur meter in ohm mode check and see if any read very low ohms, one probe on each side of cap, doesn't matter which way around.

[Bloopeta]

Re: Hitachi 50HYT62U no picture

There are many caps on those boards, you have done them before in other threads, did you not?

No, I have never done anything with these boards before

[budm]

Re: Hitachi 50HYT62U no picture

There are many caps on those boards, you have done them before in other threads, did you not?

[Bloopeta]

Re: Hitachi 50HYT62U no picture

Yep those are the driver boards.

Great, so which bits do you need ohm readings from?

[nomoresonys]

Re: Hitachi 50HYT62U no picture

Yep those are the driver boards.