TCL-color TV common faults in 65 cases - android - Phones Developers

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Filter 18.432M

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

example 1
Model: 2501C, 2568C, 2536C, 2511C
Fault phenomenon: automatic search is unsuccessful, vertical one bright line analysis and maintenance: first open the internal I2C menu to record the data, replace it with new 24C04 and then re-write it; vertical one bright line is mostly L413 inductor burn Remove, check whether R411 (680Ω) is deteriorated after repair welding, and replace it with 1K.
Example 2
Model: 2901A type failure phenomenon: the image tube is used for one year or so color cast analysis and overhaul: change the picture tube failure phenomenon: can not automatically search for analysis and maintenance: change 24C04
Fault phenomenon: The amplitude of the image is enlarged and the residual moon shape distortion analysis and overhaul: most of them are L414 (1537) bursting. After replacing with L801 (352), they can't be adjusted to normal.
Fault phenomenon: "three nos" after a vertical bright line
Analysis and overhaul: L413 can be burned off and welded.
Example 3 model: 2909A
Fault phenomenon: 1 remote control distance is short; 2 can't automatically search for the station; 3 vertical one line; 4 start "three no", and observe a horizontal bright line analysis and maintenance when the machine is in parallel: 1 C070 is not installed at the factory; 47μF/16V capacitor can be; 2 for 24C04; 3 repair welding L413, for R411; 4TA8427K (6) foot power supply diode D431 (FR105) open circuit, replaced with FR104 OK!
Example 4
Model: 2966G
Fault phenomenon: 1 automatic shutdown; 2 switch stuck; 3 full screen red image or no reception; 4 lack of L segment program; 5 automatic search station program number is always "1" does not change increment; 6 machine has "咝咝”Sound analysis and overhaul: 1 Change the R872 from 4.7/1W to 47K/W; 2 Remove the switch mold, scrape the blade hole around the front cover with a saw blade, and then re-load the spring. 3 can actually change 24C04, may need to re-adjust the data; 4 digital high-frequency head is bad; 5 is generally TB1240 (1) foot to TCLM06V3 (13) copper foil between the feet, the problem is "automatic search However, the program number is always "1", but the original stored program can be viewed normally. The analysis is that the AFT signal is not added to the (13) foot of M06V3. If the VT voltage is faulty, the original stored program cannot be viewed. TB1240 (1) pin external R203, C204 connection voltage varies between 1V ~ 4.4V, but TCLM06V3 (13) foot voltage is always 0.6V when searching, it is found that the copper foil between J111 to J212 is broken, this phenomenon It is as common as other types. 6 is actually L413 inductor core loose, use tweezer to pull open the skin and then drop 502 glue and then re- Just install it.
Example 5
Model: 2910
Fault phenomenon: A horizontal line analysis and maintenance occurs from time to time: C302 is wrong when shipped from the factory. Its value (100μF/16V) is the TDA8351(3) pin power supply filter capacitor. The measured (3) pin voltage is +18V, which should be changed to 100μF. /35V capacitor and then TDA8351 can solve the problem.
Example 6
Model: 2911D, 2911DZ, 2980G
Fault phenomenon: 1 repeated burning tube; 2 station image right shift left 1/4 vertical dark belt is the right image, no character analysis and maintenance: 1C416, C417 performance is poor, check + B, load no short circuit, hand wrap No temperature rise, and the reverse capacitance, the pillow school diode is not short-circuited. After installing the new BU4508AX, the wind will break down or turn on the power and there will be a “beep” sound and will not be turned on. At this time, the C416 and C417 can be directly replaced. ; 2D8408 (8V2) breakdown.
Example 7
Model: 2939DR
Fault phenomenon: the circumference of the grating is reduced and the pincushion distortion analysis and overhaul: This phenomenon is the deterioration of the external R232 (39K/1/2W) of the OM8838P (52) pin. Do not increase the resistance when replacing.
Example 8
Model: 2952B, C2533, 2502, 2909B
Fault phenomenon: 1 up and down jitter; 2 boot sound is particularly large; color cast, pincushion distortion, large amplitude analysis and maintenance: 1 At this time, the original 24C04 data can be changed to the new 24C04 and then changed again; When the 24C04 internal program is completely confusing, it is necessary to change the new 24C04 with experience.

Example 9
Model: 2980G, 2988D
Fault phenomenon: two insurance analysis and overhaul within one month: because it is normal after changing the insurance, in the case of replacing the insurance and burning, the degaussing coil socket can be pulled normally, indicating that the starting current is too large, only A set of three-terminal degaussing resistors (approximately 20 Ω) is required.

Example 10
Model: 2975D
Fault phenomenon: Grating image trapezoidal distortion, normal sound analysis and maintenance: OM8838P (52) pin external R232 (39K) deterioration to 50K, after the change OK.
Example 11
Model: 2977E, 2966GL, AT2956, 2510G
Fault phenomenon: batch problem, the performance is suddenly "three no" in the viewing and there is odor analysis and overhaul: the open shell found are R802 (
S237-479·NTC417) The resistor is burned and the printed circuit board is burnt at the pin. It is replaced by 7W/3R3 cement resistor, and the printed board is processed normally.
Example 12
Model: 3498GH
Fault phenomenon: 1 blue screen, no signal search; 2 often "three no" and repeated burning tube analysis and maintenance: 1 power supply board VT voltage resistance R440 (15K/2W) open circuit, with 12K replacement after 0K; 2 replacement After the tube D1880 (or D2553), the row push tube C2482 should be replaced with C4544 because the C2482 is too hot and fragile. Pay attention to the disassembly process when replacing the two components.

Example 13
Model: 9629B, 9625BZ, 2968SZ, 3438R, 2969
Fault phenomenon: analysis and maintenance of grating pincushion distortion: D421, FR104 breakdown short circuit example 14
Models: 9614C, 1419, 9621B, 9621C, 9621D, 1701, 2128, 2129, 2129S, 2166
Fault phenomenon: 1 three no; 2 start burning switch tube; 3 raster image sometimes no or horizontal one bright line analysis and overhaul: 1D805 18V voltage regulator tube breakdown short circuit; 2R808, R811, R812.R813 one of the resistance open circuit; 3IC602
The 7809 three-terminal pin is loose.
Example 15
Model: 2568, 2968SI, 2969, 2969A, 9629B, 2968P
Fault phenomenon: the boot indicator is on, no grating analysis and overhaul: the main power output inductor is soldered.