Changhong color TV repair case and data sharing - Home Appliances

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Changhong color motor core identification method: (1) Between 1991 and 1997, a four-digit naming system was used, while the area method was identified by ten digits. For example: 1 and 3 indicate NC-3 movement, 4 indicates M11 movement, 5 indicates A3 movement, 6 indicates TA two movement, 8 indicates NC-2 movement, and 9 indicates TDA movement. In 1997, the naming system changed to start with letters for the model. (2) A represents A6 movement, B represents A3 movement, D represents TDA movement, N represents NC-5 movement, G represents NC-6 movement, T represents NC-7 movement, and P represents TA movement. (3) The suffix letters of the Double Happiness R series are also used to distinguish these models. Examples include: - 14" M11 movement: CJ37A, CJ37A1 - (NC-2 movement): C1462 - (TDA movement 1): C1492 - 17" M11 movement: CK44A, C1742 - 18" M11 movement: CJ47A, CJK47A1, C1842, C1843 - (NC-2 movement): C1861, C1862, C1863, C1865 - (A3 movement): C1851, C1851K - 19" M11 movement: CK49A, C1941, C1942 - (A3 movement): C1951, C1951K - 20" M11 movement: CJ51A, CK51A, CJK51A - (NC-2 movement): CJK51B2 - 21" M11 movement: CK53A, C2141, C2122, C2143 - (NC-2 movement): CJKJ53B2, C2161, C2162, C2163, C2164, C2165, C2165P, C2165T, C2165Y, C2166, C2168, C2169, C2169A, C2169C, C2188 - (A3 movement): C2151, C2151A, C2151C, C2151Z, C2153, C2151KV, C2152, C2152KV, C2155 - (TDA movement 2): C2191, C2191A, 2191C, 2191D - (A6 movement): A2116, A2117, A2118, P2119A, C2191A, R2111, R2111A, R2113A, R2115A, R2116A, R2117A, R2118A, R2119A, R2120A, R2121A, R2122A, R2123A, R2118A - (CN-9 movement): R2112T, R2113T, R2115T/TB, R2116BT, R2117T/BT, R2118T/BT - 22" NC-2 movement: C2262, CK56B2 - 25" NC-3 movement: C2518 - (NC-2 movement): 2588A, C2589P - (TDA movement 2): C2592P, C2594P - (A6 movement): A2528, A2528B, A2528BC, R2516A, R2518A - 29" NC-2 movement: C2988, C2988P - (NC-3 movement): C2919P, C2919PS - (TDA movement 2): C2919, C2992, C2993 - (A6 movement): R2916A, R2918A, A2928 - (NC-6 movement): G2966, C2966A, C2966B, C2967, C2967A, R2916G, R2917G, R2918G, R2919G - (CN-5 movement): N2918, R2918N - (CN-7 movement): T2981, T2982 - (CH-10 movement): D2983, G2983, G2985, G2986, R2938D, G2938G, D2986, 2936FD, R2939D, 2939FD, 29SD83, 29SD89 - 34" NC-3 movement: C3418PN - 38": NC-6 movement G3898, R3818G M11 movement consists of AN5132, AN5250, AN5612, AN5622, AN5435. NC-2 movement composition: TA7680, TA7698, TA5265, TDA2009. NC-3 movement consists of TA8800, TA8783, TA8777, TA8795, TA8427, TA8739, TA8859, TA8776, TA8212. The NC-6 movement consists of TDA9808, TA8427, TA8859, TA8256, TA1229, TA8772, and STR6709. TDA movement consists of 1: TDA8305A (TDA4501), TDA3565, TDA3653. TDA movement composition 2: TDA8361 (TDA8361), TDA4661, TDA3654, TDA8395, TDA6103. A3 movement consists of LA7680 (LA7681), LA7837. A6 movement consists of: LA7688 (LA7687), LA7837, TDA7496, AN5265. The CN-5 movement consists of AN5195 (AN5095), AN5637, TDA4665 (MN3868), TDA6103, AN5534, and TEA2261. CN-7 movement consists of TDA9808, TB1227, TA8211, TA8859, TDA6103, TA8776, TA8427. CN-9 movement composition: TB1213 (TA1238), TA8427, TDA2611. CH-10 movement composition: TDA8843, TDA8350, TDA7057, TDA9859, TDA4605, TDA6107. 59. Changhong C1942 color TV: No power indicator at boot, keyboard control is normal, but remote control fails. Testing with the same CPU model's remote shows it works, indicating the remote is fine. No obvious interference lines on the screen. Suspected motherboard power supply filter capacitor issue. Capacitor C807 (100UF/400V) has only 230V, matching the mains voltage, suggesting a normal fault. Replacing the capacitor fixes the remote issue, but it still cannot shut down remotely. Observing no power indicator light, found that R823 (12K/3W) is open, replaced, and the power indicator works after remote shutdown. Both issues resolved. 2002.1.12 58. Changhong C2591 color TV: Suddenly three in the viewing. Power-on test shows 135V, line output transformer T402 input has 135V, and the first end of T402 fluctuates between 98-103V. Output tube heats slightly, suggesting the line has started working. Suspected output transformer damage. Replaced, but no change. Found resistor R412 (0.82Ω/1W) desoldered, re-soldered, and the fault was eliminated. 2002.1.10 57. Changhong N2516 color TV: Bright line after one minute. Main voltage B1 is 115V, field pulse input terminal 2 of N301 (AN5534) changes from 1.1V to 0V, field output terminal 10 from 15V to 0V. VCC1 remains 9V, VCC2 and VCC3 remain 30V. Voltage at 58-pin of N701 (AN5095k) changes from 3.8V to 0V. X-ray protection input terminal 55 increases from 0V to 0.8V, indicating a component failure. Disconnected components to find D431 (W04Z15C) low at 13.5V, connected 1N4148 diode, and the fault disappeared. 2002.1.3 56. Changhong CJK565B color TV: Bright line. Field pulse output of IC201 (TA7698) is 0V, field oscillation terminal 29 is 2.7-2.8V, field output is down. Q301 (A940) junction reverse bias is 1.9V, Q310 (C2073) C junction is 110V, Q302 (2SC1815) B-pole voltage is 0V, field output midpoint is 16V. Bootstrap resistor R313 (820Ω/1W) is open, replaced, and the fault is fixed. 2001.12.29 55. Changhong C3418P color TV: No image or sound, only unsynchronized raster. Suspected solder joint in scanning channel. Re-welded, image and sound returned. 2001.12.24 54. Changhong CJK56B color TV: Image grating stacked in middle, upper/lower amplitudes not full. Field frequency not synchronized. Midpoint of field output circuit is 30V. Field oscillation and anti-etching voltage of N201 (TA7698) are normal. Replaced bootstrap capacitor C302 (10UF/50V), which had only 7.3UF capacity. Fault resolved. 2001.11.24 53. Changhong C2991 color TV: No sound. Picture tube filament lit, cathode voltage 190V, video off. Pins 7, 8, 9 of N150 are 190V, pin 5 is 0V. R1519 (220K) is open, replaced, pin 5 voltage rises to 1.3V, image appears. 2001.11.1 52. Changhong C2165 color TV: Automatic program search can't lock H segment, occasionally locks up to three stations. Debugging intermediate frequency coils T127, T131 (TF1445) ineffective. Replaced coils, no change. N101 (TA7680) voltages normal. RC components of IF section intact. AGC potentiometer RC117 invalid. Found C126 outside 16 and 19 pins of TA7680 on C1462, replaced with 15P, C130 (2P) to 10P, H segment locked all programs. 2001.10.25 51. Changhong CK53A color TV: Sudden fire, no light. Purple light from tube, line deflection resistor R554 (100/1W) red and smoky. Checked line part, power supply normal 110V. Deflection coil disconnected, high-voltage cap tested over 30,000V, strong discharge sound. Re-welded line parts, measured line frequency 18.6K. IC501 (AN5435) foot voltages normal, replaced line oscillation and AFC parts. All capacitors invalid. Measured R505 (1K) resistance less than 1K, replaced, high-voltage cap voltage 15,000V, deflection coil inserted, voltage 25,000V. Fault detected. Rare fault caused by potentiometer, large picture tube damage. 2001.10.22 50. Changhong C2163 color TV (retrofit machine): Sometimes boots normally, sometimes not. Main voltage B1 only 26V. Replaced overvoltage protection thyristor V819 (SFDR1B42), electrolytic capacitors C814 (47U/50V), C817 (1U/50V), C820 (4.7U/50V). Invalid, replaced feedback diodes V807, V808, V809 (S5295G) with 1N4148, feedback capacitor C813 (0.47U/50V), pulse modulation transistor V811 (2SA966), V812 (2SC1959), sampling amplifier tube V813 (2SA1015). Still ineffective, replaced feedback capacitor C818 (2400P/100V), B1 outputs 115V normal. Restored protection circuit, multiple startups, B1 outputs 115V. Fault resolved. Original capacitor capacity not reduced, heated with iron, no capacity immediately. 2001.10.20 49. Changhong C2163 color TV: Film station and Shandong TV have noise, others normal. Adjusted sound IF coil T140 core invalid. Adjusted TA7680's 7-pin 8 passband coil (sound surface filter), sound restored. 2001.10.8 48. Changhong C2165 color TV: After repair, automatic search can't lock table. When no signal, no snowboard. Watching original program, noise without sound. Replaced IC1 (TA7680p), image IF coil T127, 131 (1RF1077), audio IF coil T140 (CS5245), sound IF filter Z102 (6.5M), Z103 (6.0M). 47. Changhong C2992 color TV: Horizontal bright line. Each pin of N301 (TDQ3654) voltage normal. Checked N201 (TDA8362) field scan pins 41 and 42, voltage almost normal, 42-pin voltage 0.2V lower than normal 2.8V. Resistor R392 (3.6M) open, replaced, repaired. 2001.9.25 46. Changhong C2939KS color TV: Image sometimes negative film, rest normal. Checked brightness signal processing circuit, NQ501 (TA8783N) 59-pin voltage normal 3.6V, color transient processing block NQT01 (TA8814N), pin 15, black level extension circuit NQE02 (CX20125) voltages normal. Reduced fault range to brightness processing board. Removed brightness processing board, re-soldered DQL10 (AN5342K) pin. Checked other components, normal. Reinstalled motherboard, fault remained. Directly connected 4.7U/50V capacitor to video signal input/output plug-in XTL1A of motherboard to brightness processing board, disconnected XPL1A input. Fault disappeared, repaired. 2001.8.23 45. Changhong C2165F color TV (retrofit machine): One boot light board, all functions invalid. Replaced computer block D001 (CH01001) and character block D003 (TC9020P-003). CPU power supply 5V only 1.2V, main channel power supply 12V, high-frequency head BM terminal 1.2V. Found inductance L106 broken, replaced, grating normal snowflake point, but functions still failed. Input TV signal, image appears, no sound. Keyboard and remote control invalid. Added sub-piece to CPU block, separated keyboard pulse input (output) 26-29 feet from integrated circuit block. Remote control works, then gradually inserted feet, when inserting 26 steps, remote control out of order, indicating 26 feet not right side. Followed direction to CPU, found front foot welded together, all functions, images normal, repaired. 2001.8.22 44. Changhong CJ47A color TV: After 5-15 minutes, synchronized. After synchronization, center left 1/3 screen, sometimes right. Not synchronized, digital frequency meter measured line frequency about 14.5K. Suspected line frequency and center potentiometer bad. New product replaced, fault unchanged. IC501 (AN5435) foot voltages completely normal. Line oscillation and AFC capacitor invalid. Finally, replaced line power supply filter capacitor C510 (47U/25V) to 31UF, replaced with 100UF/25V. Entire fault removed, original part reloaded. Image still normal, original fault caused by ripple power supply filter capacitor. 2001.8.21 43. Changhong C2163 color TV: Three no. Check fuse F801 (2.5A) burned black, resistance to ground 0, strip tube V405 (2SD1555) collector good, check output transformer damage; test switch on power board V806 (2SC4745), push tube 811 (2SA966) breakdown, resistor R805 (2.2 Ω) burned open, all replaced and repaired. 2001.8.12 42. Changhong C2919P color TV: Raster shrinkage occurs from time to time. When fault occurs, power supply voltage fluctuates 90V-115V. Auto-coupling voltage regulator supplies power to TV. When voltage between 220V-250V, fault more obvious. First, disconnect overvoltage protection detection diode VD821 (8.2V stable), pressure tube, overvoltage amplifier tube VQ821 (2SC2500) collector, fault unchanged; short circuit line overcurrent detection resistor R476, fault same; replace voltage regulator block VQ87 (S1854) invalid, then disconnect undervoltage amplifier tube VQ832 (2SA1015) still invalid. Connect 100W/220V incandescent lamps at both ends of C831 capacitor to accelerate fault, fault accelerated. Connect 0.39Ω/2W parallel with limit (over) current resistance R838/839 (0.27Ω/1W). Resistance, fault no longer appears, repaired. 2001.8.11 41. Changhong B2113 color TV: No characters. Check CPU D701 (CH04001) character oscillation pins (14), (15) voltage normal 5.0V, 25-pin pulse voltage 4.9V, normal, 26-pin field pulse voltage 0.4V (normally 4.2V), explain pulse circuit faulty, components related to it ineffective. Go back and check pulse circuit, when capacitor C761 (1000P) replaced, character appears, capacity basically 0. 10n ceramic capacitor replacement, repair. Special fault is line and field pulse voltages normal and not correct, but fault is normal. 2001.6.20 40. Changhong 2588A lightning strike color TV: Indicator light on, boot has no effect. When main voltage turned on, no secondary power-on, output value 148V. Output line VQ44 (2SD2253) breakdown. How to discharge tube requires such high voltage output. Path, found power supply copper bouge blown, connect with wires, temporarily do not charge tube. First repair power supply section, check regulator optocoupler NQ826 (TLP621), optocoupler current limiting resistor R842 (56Ω1/8W), work / standby switching tube VQ828 (2SC2230), main regulator integrated circuit block VQ827 (S1854 both damaged, replaced, main voltage output 115V, secondary switch machine can be used to indicate power supply repaired; then replaced new line tube, boot, sound image good, repair. 2001.6.17 39. Changhong D2965 color TV: After few minutes of work, blue screen appears, all function keys and remote control invalid. According to phenomenon, CPU 5V power supply only 4.2V, input terminal 1 of power supply integrated circuit block N090 (MC33267TV) with 5V reset only 4.3V, input terminal of current limiting resistor R091 (4.7Ω) has 12V voltage, N090, R091 severely heated, indicating N090 thermal stability poor, replaced 5 foot reset power supply integrated circuit block L78MR05, troubleshooting, repair. 2001.6.6 38. Changhong C2589 color TV: No image in viewing, no signal-like blue background, another TV in house always has signal. Power-on search again can not receive station. High-frequency head TU voltage only 4.2V when searching. TU terminal disconnected, TU voltage output terminal (capacitor CA17 hot spot) measured separately. Voltage can reach 32V during search, indicating tuner broken, replaced, repaired. 2001.5.18 37. Changhong C2162 color TV: After few minutes, image wire-like shape (line frequency seriously deviated), no image light, no light after while. Above phenomenon repeated after power on/off. When power not normal, use digital meter (TD9108 with frequency measurement) measure line frequency obviously, gradually change capacitance of oscillation part C907 (3000PF/50V), C906 (5600PF/50V), C910, 911 (1UF/50V) and resistors, AFC part of RC components, including N201 (D7698CP) and line output transformers, almost all components related to line frequency, or no effect, until last disengaged V402 (2CK75D) not work, can work hours, diode and R405 (180Ω/0.5W) connected in series between main 12V to D7698CP line oscillation power supply pin 33, only for normal operation of D7698CP internal line oscillation auxiliary power supply, when disconnect V402, D7698CP pin 33 voltage 7.8V. When voltage connected to V402, pin 33 voltage 8.3V, indicating fault due to high internal voltage of D7698CP and heat generated. Use 7.2V voltage regulator diode connected to ground at 33 feet. During observation, fault not present and repaired. 2001.5.18 36. Changhong C1942 color TV: Three no. Check fuse F801 (3.15A) blown, overvoltage protection thyristor Q804 (TPD315M), Q802 (2SA966), Q801 (2SD850) damaged, replaced and repaired. 2001.5.9 35. Changhong CK51A color TV: During viewing, screen gradually shrinks, then no light, scream. Power-on measurement output tube Q551 collector no voltage, C814 (220UF/160V) voltage 113V at both ends. Found overcurrent protection resistor R816 (5.6Ω/3W) blown, indicating short circuit in output part. Remove deflection coil insert CO-4, replace resistor R816 with 1Ω/1W resistor, turn on output transformer 5 pin voltage 113V. When deflection coil inserted, voltage drop 93V, indicating deflection coil winding portion damaged, removed and found markedly burnt, replaced with new deflection coil, repaired. 2001.5.7 34. Changhong C2919P color TV: After one hour, no sound. According to phenomenon, estimate picture tube filament voltage caused by thermal desoldering. No voltage at both ends of filament. Plug XP52B voltage 0.17V (measured by digital meter), analysis correct. Solder plug once and weld sight tube VQ55, VQ57, VQ59 again, troubleshoot and repair. 2001.4.29 33. Changhong P2119 color TV: Retrace line at top of screen, image not effective after automatically searching program. Field capacitance C310 (10UF/160) violently replaced, retrace line disappears; middle week T127 (10744) and T131 (10744) replaced and middle core fine-tuned. After auto-search, effect good and repaired. CPU (TA47C433 3849 30 channels) Changhong improved (CU47C433GP CH01003 90 channels), corresponding memory uses 24C02, remote control model K1Q. 2001.4.25. 32. Changhong C2588V color TV: Suddenly three in the viewing. Open casing and find fuse F801 (4A) burned and turned black, indicating some components damaged. Measure capacitor C809 (270UF/450V) resistance 0. Check switching tube VQ83 (2SC4706) breakdown short circuit, other tubes good condition, C809 (270UF/450V) no capacity or capacity, under welding measurement not charged or discharged. Almost open, basically no capacity, replaced with switch tube. Troubleshooting, repair. 2001.4.22 31. Changhong D2116 color TV (retrospected lightning striker): Machine used by user's mother machine antenna introduced lightning, power amplifier, DVD player, telephone, etc. all damaged. When repair sent, power indicator light on, blue background, no character, remote control not work. Integrated circuit block N240 (TDA8361), N001 (PCA84C841/177 CH05001), remote control receiving head replaced, rear panel of chassis on AV board. Transistors VS01, VS51, etc. renewed. Decide to do first repair from remote control first, measure CPU working voltage, reset voltage, crystal voltage, and remote control receiving input voltage normal. When remote controller pressed, output pin of receiving head has voltage change, four micro switches on front panel disconnected. Still same remote control does not work, so remove CPU and memory block N002 (PCF8582) from board, use 41-pin integrated circuit block socket join the board, first solder only pins necessary for CPU to work (such as power supply VCC, crystal, reset, etc.), then press remote control power switch key, measure CPU power switch output level, see if remote control can work, then remote control activated, when welding 19th foot remote control fails, indicating problem at periphery of foot. Only two micro-switches on original circuit diagram. Since two switches disconnected, what else could cause remote control not work? Carefully observe spare diode VK09 (K75D) between 19th and 20th pins on board. (Circuit can be used with reference to electric schematic of Changhong C2992.) Original picture not available. Good to measure. Then, diode soldered off one end, boot remote control works again. (But why wrong to add this diode? Answer now is CPU serial number may not match, because original block I did not see, or something different. Reason, please enlighten me!), then try to weld remaining pins of CPU, remote control works; then storage block installed, remote control fails again, indicating original storage block also damaged by lightning, replaced, characters appear on boot screen, press remote control board, TV basically has reaction, indicating CPU repaired. Press panel program preset switch to search TV programs, not receive TV, high-frequency heads all normal in search process, TV signal output terminal input to another good TV, so TV screen also good. No response; decided to input video signal of video disc and found could not input. Found VS02 (2SC1815), NS01 (HEF4053), and NS02 (HEF4053) on AV board also damaged by lightning, replaced, can input and output video signals. Can't check TV show! Introduce external video signal from 13-pin of N201 (HEF4052) (string a 10UF/50V electrolytic capacitor), clear image seen on external good TV, while video input from emitter of V246 (2SC1815). When signal on external TV, no image, indicating N201 also bad, replace, turn on TV program image immediately on two TVs, then automatically search TV program automatically, sound good, repair. 2001.4.21 30. Changhong C2168 color TV: Image effect poor, all programs played can't lock when searching programs automatically. Focus on L127 and L131 in middle of week, find capacitances inside oxidized and blackened. After replacing new week, when no signal input, adjust middle core to make pins 13 and 14 of integrated circuit block D7680CP as equal as possible when preset switch turned on/off, voltage value reaches 6.50V. When TV signal input, 13-pin voltage of D7698CP can reach 8.5V or more, then search again, image effect better, program storage complete. Repair. 2001.4.20