UHF Tuner The TV had a bad H-Output transistor. After replacing it the TV functioned great receiving all channels perfectly, except the UHF channels are all off by 51 channels. Channel 20 comes in on channel 71, 24 on 75, 31 on 82, etc. I can't find anything causing the problem. No bad solder joints that I can find. Any Ideas?

GENERAL

• TV typeCRT TV
• Screen size
  32 in
• Power Consumption Operational
  150 Watt
• Timer Functions
  Sleep, wake
• Video Interface
  Composite, S-Video
• Manufacturer
  Apex Digital, Inc.

FEATURES

• TV features
  auto volume adjustment

VIDEO

• Technology
  CRT
• Aspect ratio
  4:3

TV TUNER

• TV tuner presence
  Yes
• Analog TV tuner
  NTSC
• Reception System
  NTSC-M
• Secondary Audio Programme (SAP)
  Yes
• Secondary Audio Program (SAP)
  Yes
• Channel Coverage
  VHF:2-13, UHF:14-69, Cable:1-125
• Stereo Reception System
  MTS

AUDIO

• Speaker(s)
  2 x main channel speaker - built-in - 5 Watt
• Output Power / Total
  10 Watt
• Audio Controls
  sound mode

CONNECTIVITY

• Video interface
  composite

REMOTE CONTROL

• Type
  universal remote control
• Supported Devices
  DVD player

CONVENIENCE

• Closed Caption Capability
  Yes
• Parental Channel Lock
  Yes
• V-Chip Control
  Yes
• Menu language
  Spanish

MANUFACTURER WARRANTY

• Service & support
  1 year warranty

POWER

• Nominal Voltage
  AC 120 V
• Power consumption operational
  150 Watt

DIMENSIONS & WEIGHT

• Weight
  156.5 lbs

DIMENSIONS & WEIGHT (SHIPPING)

• Width
  38.7 in
• Depth
  29.2 in
• Height
  30.5 in
• Width (Shipping)
  38.7 in

GENERAL

• Manufacturer
  Apex Digital, Inc.
  

Your old tv does not have more than 11 slots to store channel .

Thats why you are not able to get more than 11 channels .


But let me confirm it .


SAM ANDERSON

Check the settings to see if it is locked on channel 3 for external tuner source to have an input from a cable box ant in that needs 3 to function or from some other externally decoded signal like a vcr. Does the TV have a Digital tuner or the old analog tuner? If it's digital you can hook up a rabbit ear antenna with the UHF output on it & should be able to tune in some stations. If it's the old style then you will need a converter box to get it to receive any stations.
Fist check the settings to see if it has it set to lock on channel 3 for external tuner source.

see the b. diagram and test the power supply ;transistor, fuse, filter, switch, c.breaker rectifier,IC regulator voltage.
measure the horizontal output =125vdc
all other circuit:12vdc
color:12vdc

TUNING This DVD+VCR is equipped with a frequency synthe- sized tuner capable of receiving up to 181 channels. These include VHF channels 2-13, UHF channels 14-69 and CATV channels 1-125. Auto Channel Programming 1. Choose the SOURCE SELECT option, then use b / B to select TUNER. Use b / B to switch among TUNER, LINE1, and LINE2. 2. Choose the AUTO CHANNEL SET option, then use b / B to find channels. • The tuner will automatically cycle through all available channels (TV/CATV) in the area and place them in the tuner's memory. •After the AUTO CHANNEL SET is complete, the TUNING menu will hide and return to the TV screen automatically. 3. Make sure the TUNING BAND is set appropriately (TV or CATV). • TV : If you are using a standard antenna to receive channels. •CATV : If you are using basic cable to receive channels.

have your tuner check for any cold solder on pins.

It may be your amplifier protection circuitry is being activated and shutting down automatically. This is usually caused by a faulty output transistor in one or more of the channels. I recently repaired my Onkyo TX-SR500 which had this problem.
Using a multimeter on ohms check between C and E on each of the ten output transistors. I found Q6051 and Q6061 to be short cct on all pins. Once you have located the faulty channels check the adjacent components for open or short cct.

I replaced the following components,
Q6051 (2SD1047)
Q6061 (2SB817)
R6091 (2.2ohm fusible)
R6081 (2.2ohm fusible)
R6101 2x 0.22ohm 2W
Q6031 (2SD2061)

The amplifier now works perfectly, cost of the parts is about $15-$20.
If you don't feel confident doing this yourself just find a friend or tech who can do it for you.

That works great except I can get the tuner to program any channels above channel47. Is this a limitation of this older model TV yes there is limitation in old tv. is there some setting I can change in order to get more channels using the tv tuner? in INDIA what we do is put a remote control ckt which gives us about 250 channels. of course we replace tuner also called hyper tuner along with remote ckt or replace whole kit which are cheaply available.& serves the purpose. hope this will help

Replace tuner, get number and order from MCM, or Bluestar-online, Tritronics.

Depending on the chassis, it could be the OBT has a bad componet or a parts bad in it or if theres a standup tuner it has to be replaced. You should take the set into a repair place for an estimate good Luck