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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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GE 25GH350 CTC177AJ2 Snowy channals above 50.
This is a these are motel sets. I got 3 in, I resoldered all known
connections and replace the EPROM's, and all 3 Osc\mixer ICs. The 2 in question came in for no channels from 2 to 50, after replacing the parts and soldering, now the two have snowy pictures from 51 and above. I replaced U3201, Q7403, and U7301. T checked R7121. Any help I will thank you for in advance. Ken Marshall Suburban Electronics PO Box 251 Hilliard, Oh 43026-0251 |
#2
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GE 25GH350 CTC177AJ2 Snowy channals above 50.
You will need Chipper Checker and Multi
Channel Geny to do a complete alighment. First check your own work and make sure no solder bridges. kip -- "Watch the return E-Mail addy its false" "Suburban" wrote in message ... This is a these are motel sets. I got 3 in, I resoldered all known connections and replace the EPROM's, and all 3 Osc\mixer ICs. The 2 in question came in for no channels from 2 to 50, after replacing the parts and soldering, now the two have snowy pictures from 51 and above. I replaced U3201, Q7403, and U7301. T checked R7121. Any help I will thank you for in advance. Ken Marshall Suburban Electronics PO Box 251 Hilliard, Oh 43026-0251 |
#3
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GE 25GH350 CTC177AJ2 Snowy channals above 50.
Suburban:
Once you replaced the EPROM you lost all of the tuner alignment parameters in all of the televisions unless you read and save the data from each television's old EPROM. The first order of business after verifying your rework is to perform a 125 channel tuner alignment. A chipper checker and 125 channel television signal generator would be most helpful at this point. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Suburban" wrote in message ... This is a these are motel sets. I got 3 in, I resoldered all known connections and replace the EPROM's, and all 3 Osc\mixer ICs. The 2 in question came in for no channels from 2 to 50, after replacing the parts and soldering, now the two have snowy pictures from 51 and above. I replaced U3201, Q7403, and U7301. T checked R7121. Any help I will thank you for in advance. Ken Marshall Suburban Electronics PO Box 251 Hilliard, Oh 43026-0251 |
#4
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GE 25GH350 CTC177AJ2 Snowy channals above 50.
Did you do the full chassis/eeprom alignment per the service manual?
Which includes the 125 channel cable tuner alignments!!!!! You need a 125 channel calibrated signal generator with adjustable output in order to do the alignment, along with an RCA remote control. The TAG001 tuner generator Thomson use to sell worked great because you could change the tv and generator channel at the same time. David Suburban wrote in message ... This is a these are motel sets. I got 3 in, I resoldered all known connections and replace the EPROM's, and all 3 Osc\mixer ICs. The 2 in question came in for no channels from 2 to 50, after replacing the parts and soldering, now the two have snowy pictures from 51 and above. I replaced U3201, Q7403, and U7301. T checked R7121. Any help I will thank you for in advance. Ken Marshall Suburban Electronics PO Box 251 Hilliard, Oh 43026-0251 |
#6
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GE 25GH350 CTC177AJ2 Snowy channals above 50.
Foregt to mention this transistor in my first suggestion - It can also
cause snowy channels above 51: Q7101 UHF RF AMP MOSFET RCA # 200566 Robert McPherson (David) wrote in message . com... Did you do the full chassis/eeprom alignment per the service manual? Which includes the 125 channel cable tuner alignments!!!!! You need a 125 channel calibrated signal generator with adjustable output in order to do the alignment, along with an RCA remote control. The TAG001 tuner generator Thomson use to sell worked great because you could change the tv and generator channel at the same time. David Suburban wrote in message ... This is a these are motel sets. I got 3 in, I resoldered all known connections and replace the EPROM's, and all 3 Osc\mixer ICs. The 2 in question came in for no channels from 2 to 50, after replacing the parts and soldering, now the two have snowy pictures from 51 and above. I replaced U3201, Q7403, and U7301. T checked R7121. Any help I will thank you for in advance. Ken Marshall Suburban Electronics PO Box 251 Hilliard, Oh 43026-0251 |
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