FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   PreferencesPreferences   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Forum index » Electronix » Repair
JVC 20N11-PH
Post new topic   Reply to topic Page 1 of 1 [4 Posts] View previous topic :: View next topic
Author Message
mhel
electronics forum beginner


Joined: 16 Jul 2006
Posts: 3

PostPosted: Sun Jul 16, 2006 10:36 am    Post subject: JVC 20N11-PH Reply with quote

My TV with model # AV_20N11-PH has a problem
on receiving the low frequency band channel ( ch 2,3 and 5 ),
it has no output. Any one can help me on this, or can email me
the datasheet of this brand and model.

Thanks in advance!
Back to top
Franc Zabkar
electronics forum Guru


Joined: 01 May 2005
Posts: 616

PostPosted: Mon Jul 17, 2006 8:51 am    Post subject: Re: JVC 20N11-PH Reply with quote

On 16 Jul 2006 03:36:52 -0700, "mhel" <rbkatipunan@dreamvsat.ph> put
finger to keyboard and composed:

Quote:
My TV with model # AV_20N11-PH has a problem
on receiving the low frequency band channel ( ch 2,3 and 5 ),
it has no output. Any one can help me on this, or can email me
the datasheet of this brand and model.

Thanks in advance!

The general procedure would be to check that the band switching
voltages are correct. A typical tuner will have BU, BH, and BL pins
for UHF, VHF high, and VHF low, respectively. Some models have a band
switching IC, others may drive the tuner pins via a uP. If BL is on
and BU and BH are both off, and if the tuning voltage varies smoothly
up and down through its entire range, then I'd suspect a problem with
the tuner.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
Back to top
mhel
electronics forum beginner


Joined: 16 Jul 2006
Posts: 3

PostPosted: Tue Jul 18, 2006 1:39 am    Post subject: Re: JVC 20N11-PH Reply with quote

Thanks Franc.
Just want to know the voltages for BU, BH and BL
and what is the meaning of uP.
Thanks again

Quote:
On 16 Jul 2006 03:36:52 -0700, "mhel" <rbkatipunan@dreamvsat.ph> put
finger to keyboard and composed:

My TV with model # AV_20N11-PH has a problem
on receiving the low frequency band channel ( ch 2,3 and 5 ),
it has no output. Any one can help me on this, or can email me
the datasheet of this brand and model.

Thanks in advance!

The general procedure would be to check that the band switching
voltages are correct. A typical tuner will have BU, BH, and BL pins
for UHF, VHF high, and VHF low, respectively. Some models have a band
switching IC, others may drive the tuner pins via a uP. If BL is on
and BU and BH are both off, and if the tuning voltage varies smoothly
up and down through its entire range, then I'd suspect a problem with
the tuner.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
Back to top
Franc Zabkar
electronics forum Guru


Joined: 01 May 2005
Posts: 616

PostPosted: Tue Jul 18, 2006 10:37 pm    Post subject: Re: JVC 20N11-PH Reply with quote

On 17 Jul 2006 18:39:49 -0700, "mhel" <rbkatipunan@dreamvsat.ph> put
finger to keyboard and composed:

Quote:
Thanks Franc.
Just want to know the voltages for BU, BH and BL
and what is the meaning of uP.
Thanks again

uP = microprocessor

IIRC, in a typical tuner, BU, BH, and BL sit at +12V when selected and
0V when deselected. The tuner's pinout is often stamped on the can.

See the universal tuner at the bottom RH corner of this page:
http://www.wagner.net.au/Catalogue/03_01.pdf


Quote:
On 16 Jul 2006 03:36:52 -0700, "mhel" <rbkatipunan@dreamvsat.ph> put
finger to keyboard and composed:

My TV with model # AV_20N11-PH has a problem
on receiving the low frequency band channel ( ch 2,3 and 5 ),
it has no output. Any one can help me on this, or can email me
the datasheet of this brand and model.

Thanks in advance!

The general procedure would be to check that the band switching
voltages are correct. A typical tuner will have BU, BH, and BL pins
for UHF, VHF high, and VHF low, respectively. Some models have a band
switching IC, others may drive the tuner pins via a uP. If BL is on
and BU and BH are both off, and if the tuning voltage varies smoothly
up and down through its entire range, then I'd suspect a problem with
the tuner.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
Back to top
Google

Back to top
Display posts from previous:   
Post new topic   Reply to topic Page 1 of 1 [4 Posts] View previous topic :: View next topic
The time now is Fri Nov 24, 2017 7:16 am | All times are GMT
Forum index » Electronix » Repair
Jump to:  


Copyright © 2004-2005 DeniX Solutions SRL
Other DeniX Solutions sites: Unix/Linux blog |  Unix/Linux documentation |  Unix/Linux forums |  Medicine forum |  Science forum  |  Send and track newsletters


Powered by phpBB © 2001, 2005 phpBB Group