RCA CTC175A2

Any help in solving this problem would be appreciated. Have no schematic, no scope. The problem is intermittent.

Manufacturer: RCA
Model: F20602SE
Chassis: CTC175A2
Mnfct date: Sept. 1995

Picvture: Raster exitss, freqeuntly no picture with horizontal stripes, some time very very feeble picture with lots of snow.

Sound: From no reception sound with highly pitched, almost like dentist's drill to very feeble sound with white noise.

Tested this tough dog in various homes with good elderly existing signbal

Probably due to bad solder joints inside the tuner box.

Resolder all the grounbds

fidik's post not on my server, but the information is at www.repiarfaq.org and other web sites, search for Thomson on board tuner ground probnlem.

Unless fidik has lots of expertience working with surface mount components and a good temperature controlled soldering stastion, I would strongly recommend the set be taken in for a proper repair by an judicially experienced technician with those sets.

Go see Peter's post today as he botcehd his repair attempt on the tuner grounds. These are not DIY repairs for people with little experience.

Thank you all!

my empployer has 2200 ctc175 hotel motel hospital.
sound like you have more than one problem white horizontal is retrace lines do to bad gun open cathode.snow is caused by cold soldered on grounds around tuner box.this tv is know for this also loose cable barrel connection tuner box.last year we replaced 36 picture tubes for white horiz retrace shot gunning tube pix tube checker will not fix we tryed several times.worst thing of it all you can no longer buy tube rebuild only if you got at least 8 or 10 at once rebuilders wont do it.

3276 wrote:

Any help in solving this problem would be appreciated. Have no schematic, no scope. The problem is intermittent.

Manufacturer: RCA
Model: F20602SE
Chassis: CTC175A2
Mnfct date: Sept. 1995

Picvture: Raster exitss, freqeuntly no picture with horizontal stripes, some time very very feeble picture with lots of snow.

Sound: From no reception sound with highly pitched, almost like dentist's drill to very feeble sound with white noise.

Tested this tough dog in various homes with good elderly existing signbal

if need some voltages i have a RCA book with some skem.for the Ctc175 chassis,also here a few tips for these chassis hope it will help.
Anonymous
RCA CTC-175
Wed Dec 24, 2003 12:51PM
24.235.162.109


RCA
CTC175
INTERMITTENT VERTICAL SWEEP
CHECK/RESOLDER CONNECTIONS ON ALL GROUND SHIELDING AROUND TUNER AND SYSCON IC

RCA
CTC175
NO VERTICAL SWEEP
CHECK/REPLACE C4503 (SMD) - U4501 (P/N# 215531)


RCA
N/A
CTC175
LOW OR NO SOUND
REPAIRED ALL COMMON GROUND CONNECTIONS AND REPLACE EEPROM


RCA
N/A
CTC175
SET TURNS ITSELF ON AND OFF, CHANGES CHANNELS,MENU COMES UP AND MUTES ITSELF
CHECK/REPLACE IR3401


RCA
N/A
CTC175
TUNER LOCAL OSCILLATOR DROPS OUT ON BAND TWO
CHANGE C7311 TO NEW PART (P/N# 194906) - BANDS ONE AND TWO OF TUNER MUST BE REALIGNED


RCA
N/A
CTC175
NO STEREO - OSD STEREO INDICATOR NEVER COMES ON
CHECK/REPLACE C1707 (P/N# 205230)


RCA
N/A
CTC175
SHUTS OFF INTERMITTENTLY
CHECK/REPLACE ON FLYBACK PINS, ESPECIALLY 1,2,8,10


RCA
N/A
CTC175
NO VERTICAL AND R4511 IS BURNED
CHECK/REPLACE U4501 (P/N# 215531) AND R4511 (P/N# 215577)


RCA
N/A
CTC175
MENUS ROLL VERTICALLY ON SCREEN -- VERTICAL RETRACE ON THE TOP 3-4 INCHES OF SCREEN
CHECK/REPLACE IC4501 (TDA8172)


RCA
N/A
CTC175
POOR REGULATION - B+ RUNNING ABOUT 120-125v
CHECK/REPLACE Q4153 FOR LEAKAGE - MAY CHECK FINE OUT OF CIRCUIT


RCA
N/A
CTC175
NO VERTICAL SWEEP - MISSING 24v SUPPLY FROM FLYBACK
CHECK/RESOLDER CONNECTIONS ON PIN #10 OF FLYBACK


RCA
N/A
CTC175
OSD AND MENUS ROLLS
CHECK/REPLACE C3317


RCA
N/A
CTC175
NO OSD AND NO REMOTE OPERATION
CHECK/REPLACE CR4104 (5.6v ZENER - P/N# 215488), Q4103 AND Q4105 (P/N# 146851)


RCA
N/A
CTC175
INTERMITTENT TUNER OPERATION
CHECK/REPLACE Y7401 (P/N# 182839)


RCA
N/A
CTC175
DEAD SET WITH NO SOUND OR PICTURE BUT HAS HIGH VOLTAGE
CHECK/REPLACE CR4704 (P/N# 207878),R4702 (3.3 P/N# 217315) AND R4517 (24 P/N# 217314)


RCA
N/A
CTC175
CHROMA BAR AT THE TOP OF THE PICTURE DURING PLAYBACK OF A VIDEO TAPE
CHECK/REPLACE U1001 (P/N# 215524)


RCA
N/A
CTC175
NO HORZ. SWEEP - ONLY HAS ONE VERTICAL LINE
CHECK/REPLACE C4403 (PART NUMBER VARIES DEPENDING ON CRT)


RCA
N/A
CTC175
WILL NOT TUNE ANY CHANNELS - ONLY HAS SNOW
CHECK/REPLACE Y7401 (P/N# 182839)


RCA
N/A
CTC175
DEAD SET WITH NO SOUND OR PICTURE BUT HAS HIGH VOLTAGE
CHECK/REPLACE CR4704,R4702 AND R4517


RCA
N/A
CTC175
DEAD SET
CHECK/REPLACE R4104 (1.5m @ 1/2w)


RCA
N/A
CTC175
INTERMITTENT LOSS OF AUDIO OR VIDEO
CHECK/RESOLDER CONNECTIONS ON ALL GROUND SHIELDS AROUND TUNER AND SYSCON IC


RCA
N/A
CTC175
UNABLE TO TUNE ABOVE CHANNEL 4 OR INTERMITTENT SHUTDOWN
CHECK/RESOLDER CONNECTIONS ON ALL GROUND SHIELDS AROUND TUNER AND SYSCON IC


RCA
N/A
CTC175
DEAD SET WITH NO SOUND OR PICTURE BUT HAS HIGH VOLTAGE
CHECK/REPLACE CR4704 (P/N# 207878),R4702 (P/N# 215211) AND R4517 (P/N# 215208)


RCA
N/A
CTC175
NO VERTICAL AND NO AUDIO
CHECK/REPLACE CR4704 (P/N# 207878)


RCA
N/A
CTC175
INTERMITTENT VERTICAL SWEEP OR SET TRIES TO COLLAPSE AT THE TOP
CHECK/RESOLDER CONNECTIONS ON U1001 PINS 15,16,17 AND 18 AND ALL PINS ON U4501


RCA
N/A
CTC175
NO COLOR ON SOME CHANNELS OR ON SOME VIDEO GAMES
CHECK VALUE OF R2805, IF NOT A 750 , THEN REPL. (PN#215200) CHANGE R2806 TO A JUMPER,REMOVE C2806,ADD 1uF TO C2801 PADS


RCA
N/A
CTC175
AGC OVERLOAD - PIN #12 OF U1001 STAYS AT 8 VOLTS - WHEN 'IF' IS INJECTED AT PIN #1 OF U7301 , THEN NORMAL PICTURE
CHECK/REPLACE U7301 (P/N# 215532)

RCA
Chassis:ctc175
Low audio
eeprom
Commentsosted this only because a lot of people still ask this question.

RCA
Chassis:CTC175A
Dead set.
Q4103.
Commentsartially shorted.


RCA
Chassis:ctc175
horz jitter
c4133

RCA
Model20132sl
Chassis:ctc175k
low distorted audio 1 channel,missing other channel
ic1701 la7765

RCA
Model:
Chassis:ctc175
horz jitter
c4133

GE
Model:20GT320
Chassis:CTC 175A
Channels cut out intermittently looks like AGC overload.
Resolder R602 under tuner shield, cracked connection.

RCA
Chassis:ctc175
eeprom replacment
build a double eeprom socket
Comments:To shorten eeprom replacement time build an eeprom fixture. You need 2ea 8-pin sockets, 1 dpdt switch, 1 small bread board, 4-pin header, and some wire. Conect it so that the switch switches the clock and data lines(pins 5&6). How this helps is if you have a bad eeprom install old and new eeproms in sockets conect in place of eeprom on chassis, start set with new eeprom, swith to old eeprom and look to see if tuner data is salvagable and wright it down, switch to new eeprom adjust values, turn set off and install new eeprom on chassis

RCA
Chassis:ctc175
eeprom replacment
build a double eeprom socket
Comments:To shorten eeprom replacement time, build an eeprom fixture. You need 2ea 8-pin sockets, 1 dpdt switch, 1 small bread board, 4-pin header, and some wire. Conect it so that the switch switches the clock and data lines(pins 5&6). How this helps is if you have a bad eeprom install old and new eeproms in sockets conect in place of eeprom on chassis, start set with new eeprom, swith to old eeprom and look to see if tuner data is salvagable and wright it down, switch to new eeprom adjust values, turn set off and install new eeprom on chassis

RCA
Chassis:ctc175
eeprom replacment
build a double eeprom socket
Comments:To shorten eeprom replacement time, build an eeprom fixture. You need 2ea 8-pin sockets, 1 dpdt switch, 1 small bread board, 4-pin header, and some wire. Conect it so that the switch switches the clock and data lines(pins 5&6).Pin 8 is +5 and gnd pins1,2,3,4,&7. How this helps is if you have a bad eeprom install old and new eeproms in sockets conect in place of eeprom on chassis, start set with new eeprom, swith to old eeprom and look to see if tuner data is salvagable and wright it down, switch to new eeprom adjust values, turn set off and install new eeprom on chassis

RCA
Chassis:ctc175
eeprom replacment
build a double eeprom socket
Comments:To shorten eeprom replacement time, build an eeprom fixture. You need 2ea 8-pin sockets, 1 dpdt switch, 1 small bread board, 4-pin header, and some wire. Conect it so that the switch switches the clock and data lines(pins 5&6).Pin 8 is +5 and gnd pins1,2,3,4,&7. How this helps is if you have a bad eeprom install old and new eeproms in sockets conect in place of eeprom on chassis, start set with new eeprom, swith to old eeprom and look to see if tuner data is salvagable and wright it down, switch to new eeprom adjust values, turn set off and install new eeprom on chassis.

Ivetech , thank you so much. Hope this will help 3276

You're well come.also suggest you to check the regulator,and fly,also replace CR4704 even if it checks good.

you're well come. Check also for 12v run,if low replace CR4704 even if it checks good,also it could be the Regulator,and the flyback.

This is great information for people 'suffering' the same problem as 3276 as well