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 fails, vertical bright line. Analysis and maintenance: Open the internal I2C menu to record data, replace with a new 24C04 chip, then reprogram it. A vertical bright line is often caused by a burned L413 inductor. After repair welding, check if R411 (680Ω) is degraded and replace it with 1K. Example 2 Model: 2901A Fault phenomenon: Color cast after one year of use. Analysis and maintenance: Replace the picture tube. If automatic search fails, try replacing the 24C04 chip. For image enlargement and residual moon shape distortion, it's usually due to a burst L414 (1537). Replacing it with L801 (352) may not resolve the issue, requiring further adjustment. Example 3 Model: 2909A Fault phenomenon: 1. Remote control range is short; 2. Can't automatically search for stations; 3. Vertical bright line; 4. "Three no" condition with a horizontal bright line. Maintenance: 1. C070 was not installed at the factory; install a 47μF/16V capacitor. 2. Replace 24C04. 3. Repair weld L413 and check R411. 4. TA8427K (pin 6) power diode D431 (FR105) is open; replace with FR104. Example 4 Model: 2966G Fault phenomenon: 1. Automatic shutdown; 2. Switch stuck; 3. Full screen red or no reception; 4. Missing L segment program; 5. Automatic search always shows “1”; 6. Machine makes a hissing sound. Analysis and maintenance: 1. Change R872 from 4.7/1W to 47K/W. 2. Remove switch mold, scrape blade hole, and re-install spring. 3. Replace 24C04 and re-adjust data. 4. Check digital high-frequency head. 5. TB1240 (pin 1) to TCLM06V3 (pin 13) copper foil is broken. Adjust VT voltage. 6. L413 core is loose; use tweezers to open, apply 502 glue, and reinstall. Example 5 Model: 2910 Fault phenomenon: Occasional horizontal line. Maintenance: C302 was incorrectly installed at the factory. It should be 100μF/35V instead of 100μF/16V. Replace it to fix TDA8351(3) pin voltage. Example 6 Model: 2911D, 2911DZ, 2980G Fault phenomenon: 1. Repeatedly burning tubes; 2. Image shifts right with dark vertical band; 3. No characters on screen. Maintenance: 1. Poor performance of C416 and C417. Replace BU4508AX. 2. D8408 (8V2) breakdown. Example 7 Model: 2939DR Fault phenomenon: Grating shrinkage and pincushion distortion. Maintenance: External R232 (39K/1/2W) of OM8838P (pin 52) has deteriorated. Replace without increasing resistance. Example 8 Model: 2952B, C2533, 2502, 2909B Fault phenomenon: 1. Jitter up and down; 2. Loud boot sound; 3. Color cast and large amplitude distortion. Maintenance: Replace 24C04 and reprogram. If internal data is corrupted, use a known good 24C04. Example 9 Model: 2980G, 2988D Fault phenomenon: Two fuses blow within a month. Maintenance: After replacing the fuse, if it blows again, check the degaussing coil socket. If starting current is too high, install a 20Ω three-terminal resistor. Example 10 Model: 2975D Fault phenomenon: Trapezoidal distortion, normal sound. Maintenance: R232 (39K) at OM8838P (pin 52) has deteriorated to 50K. Replace it. Example 11 Model: 2977E, 2966GL, AT2956, 2510G Fault phenomenon: Batch problem, sudden "three no" condition and burning smell. Maintenance: Found that R802 (S237-479·NTC417) resistor is burned and PCB is damaged. Replace with 7W/3R3 cement resistor. Example 12 Model: 3498GH Fault phenomenon: 1. Blue screen, no signal; 2. Frequent "three no" and tube burnout. Maintenance: 1. R440 (15K/2W) on power supply board is open; replace with 12K. 2. Replace D1880 (or D2553), and replace C2482 with C4544. Be cautious during replacement. Example 13 Model: 9629B, 9625BZ, 2968SZ, 3438R, 2969 Fault phenomenon: Pincushion distortion. Maintenance: D421 or FR104 is broken. Example 14 Models: 9614C, 1419, 9621B, 9621C, 9621D, 1701, 2128, 2129, 2129S, 2166 Fault phenomenon: 1. Three no; 2. Burned switch tube; 3. Sometimes no raster or horizontal bright line. Maintenance: 1. D805 18V regulator tube is broken. 2. One of R808, R811, R812, R813 is open. 3. IC602 7809 three-terminal pin is loose. Example 15 Model: 2568, 2968SI, 2969, 2969A, 9629B, 2968P Fault phenomenon: Boot indicator on, no raster. Maintenance: Main power output inductor is soldered.