3.22.1 color TV configuration list main iccpu: Z90231VTCL-M12, m37221m6, TCL M11, TCL m11v30, TCL m11v10, TCL m11vip, TCL m19v2p or z90133: Small Signal Processing IC: om8838, om8839, tda8840 or tda8841 models 2111d, rj9d, 5E, 2366d1, 5E, 2180g, 5E, at2190, 5E, 2136g, 2115d, 1096d, 2511d, 2539d, 2511d1, 2539d1, 2510g, 2511dr, 2539dr, 2539d, 2511dz, 2511f, 2516d, 2580g, 2588bd, 2580gi, 2516b, 2536g, 2575d, 2588g, 2502d, at2509, at2586, at25901, at2575, 2927d, 2916d, 2939d, 2966dg, 2939r, At2956, 2975d, 2916d, 2939d, 2966dg, 2939r, at2956, 2975d, at2986z, 2910d, large, 2911d, 2911d1, large, 2980g1, 2980g, 2988g, 2988bd, 2988di, at2990, 2916d, 2875d, 3811di, 3811gi, 3416, 3438d, 3416di, 3438dr, 3416d, 3480gi, 2910g, expires, 2939dr, expires, at2580d, expires, rdt213, (FM/DVD/TV/Radio), 2131i, 2529g, 2539di, 2580d, 2910, 2502d, 2516, 2575at, 2875d, 2910g, 2939, 2939dr, 2939dg, 2980d, 2980db, 2988db, 3409d, 3416d, at2156, at2186, AT2 190, at2975d, at2986z, at2986g, at2990b3.22.2 bus Adjustment Method remove the user remote control, fill in a diode 1n4148 at the j03 (d04) Position on the circuit board, the positive and negative directions are the same as d03, press the initialization key or two menu keys (21 inch TV sets press the beauty screen key (image) to enter. Remotely shut down and quit. 3.22.3 bus failure phenomenon: the image is non-stop flashing, and the color changes with the flashing. Troubleshooting prompt: Enter the bus and change combf (comb filter) item data from "1" to "0. 3.22.4 hardware fault common fault phenomenon 1: tcl2956 color TV (om8838), automatically shut down without any regularity, then automatically boot. Troubleshooting Tips: the power of the power-off tool is tested instantly, and the power of the power-off Tool + 140v and + 8 V is normal. The power-on-line transmission tube (bf422p) is replaced and the fault disappears. Fault symptom 2: 2988d color TV (om8838), TV image effect is poor, snowflake is more, AV is normal. Troubleshooting tip: The 53-pin external of the om8835 center puts the AGC filter capacitor c242 (1 UF/50 V) out of capacity. Fault Phenomenon 3: TCL-2588DB color TV (om8838) No light silent, but the indicator has been flashing. Troubleshooting Tips: Increase the acceleration pole (G2) voltage, and a whiteboard grating with a return line appears on the screen. Most of the faults are due to poor performance of d203 (8.2 V) (d203 is not marked on the drawing ). Some models also need to check whether c217 leaks. Fault Phenomenon 4: TCL-2516D color TV (om8838), pillow distortion. Troubleshooting Tips: the fault handling items include: d406 (fr104), c414 (10 UF/160 V), d409 (fr104), and r416 (10 k/1 W) q353 (d1499), c356 (4.7 UF/50 V), d405 (by228), l401, c414 (10 UF/160 V ). Fault Phenomenon 5: TCL-2975D color TV (om8838), do not change the station when the sound is normal, but after the change of three no, shut down and then open, and can watch normally. Troubleshooting prompt: If the o8838 18-foot voltage is measured (the normal value is 5.5v ~ 7 V) All are 4 V. Check the 9 transistor and relevant resistance parts on the CRT tail board, especially the q502 ~ Q504, c519 capacitor (2.2nf/2kv ). Among them, the da4544 used by q502 is inferior components. It should be replaced with bf869. In addition, check whether the 18-foot offset resistance r281 (33 K) is open. Fault Phenomenon 6: TCL-2975D color TV (om8838), three none, but + B voltage (+ 140 V) normal. Troubleshooting prompt: If the c416 (470pf/2kv) in the 48-pin external Sandburg pulse circuit of om8838 is disconnected, the vibration is triggered. The fault is mostly caused by c416 damage. Because c416 is close to the heat source, it is easy to fail. Fault Phenomenon 7: yinjia series (om8838) color TV, no grating when changing the station. Troubleshooting prompt: Cancel r280 and r281; change r205 to 3.9 K. Fault Phenomenon 8: yinjia series (om8838) color TV. The remote control distance is short. Tip: Add c070 capacitor. Replace the receiver with a p8580 or rpu6985 receiver. Fault Phenomenon 9: Silver Jia series (0m8838) color TV sets, with a few flashing blue grating. TIPS: Change r207 to 150 Ω, R206 to 390 Ω, c209 to 0.22 UF/50 V, and c280 to 1 UF/50 V. Fault Phenomenon 10: yinjia series (0m8838) color TV sets are vulnerable to damage 2sd667a during standby and startup switching. Troubleshooting prompt: Change 2sd667a to 2sd1237a. Fault Phenomenon 11: The yinjia series (om8838) color TV sets the vertical lines are green when the screen is dark. Troubleshooting prompt: Change c511 from 270pf to 240pf, and change csung from 330pf to 240pf. Fault Phenomenon 12: The yinjia series (om8838) color TV sets flash in color when the image mode is changed to "soft. Troubleshooting prompt: Change c420 to 100 UF/160 V. Fault Phenomenon 13: yinjia series (om8838) color TV, multi-channel image drawing. Troubleshooting tip: Change r226 and r390 to 1 K. At the fifth foot of ic201, an indirect 220pf capacitor is used. Fault 14: yinjia series (om8838) color TV, repeatedly burned the Integrated Block output. Troubleshooting Tips: A 0.1 UF/63v capacitor is added to the ③ and 6th ports of the Integrated Block output. An o.01uf/63v capacitor is added between the 6th and 6th ports. Fault Phenomenon 15: om8838 movement color TV, repeatedly burned output Integrated Block. Troubleshooting tip: Add a 0.1uf capacitor at c308 and c307a, and add a 0.01uf capacitor at c307b. Fault Phenomenon 16: The om8838 movement color TV cannot be stored. Troubleshooting prompt: ground the 7th foot of ic002. Fault Phenomenon 17: om8838 movement color TV, local platform color exception. Troubleshooting Tips: For Mitsubishi CPU, change r211 from 330 Ω to 220 Ω, and add a 10pf capacitor: zilog CPU machine between 35 and 37 of ic201, change r216 from 330 Ω to 220 Ω, and add a 10pf capacitor between 35 and 37 feet of ic201. Fault Phenomenon 18: om8838 movement color TV, with sound ranging from 0 ~ 1. mutation. Troubleshooting prompt: The m6r version of the CPU r611, r612, r614, R615 are all changed to 4.7 K. Fault Phenomenon 19: om8838 movement color TV, non-standard signal image drawing. Troubleshooting prompt: Enter the repair status, raid data recovery, set the TV to the direct boot mode, and set the power mode to 0. Fault Phenomenon 20: om8838 movement color TV, some images Distorted. Troubleshooting prompt: Change 21 inch to 0.47 UF/50 V for 29 inch and 0.47 to UF/50 V. Fault Phenomenon 21: om8838 movement color TV, character beating. Troubleshooting prompt: Change r315 to 120 Ω. Fault Phenomenon 22: om8838 movement color TV, some of which have no color. Troubleshooting prompt: Change c247 from 15pf to 12pf. Fault Phenomenon 23: om8838 movement color TV, Bass expansion function with communication sound. Troubleshooting Tips: paste the large aluminum foil on the graphite layer of the tube housing at the relative position of the Bass expansion board. Fault Phenomenon 24: om8838 movement color TV, inverted trapezoid grating when the cold machine is started. Troubleshooting prompt: replace om8838. Fault Phenomenon 25: om8838 movement color TV, VL weak signal when the power supply 50Hz Interference. Troubleshooting Tips: Change c810 to the one in the range of and. Fault Phenomenon 26: tcl2911d (d movement) color TV, repeatedly burning line tube. Maintenance Tips: the filtering capacity of the power supply at the excitation level is reduced, resulting in insufficient line excitation, thus burning the line pipe. Fault Phenomenon 27: 2911d color TV. Troubleshooting prompt: The tda8841 (or om8838) 40-foot unlimited excitation pulse output is measured with an oscilloscope at startup, and the 41-foot voltage is as high as 4 V. the normal voltage is 0.9v. after check, the back-end feedback capacitor c416 leaks, as shown in 3-13. The new one is normal. Fault Phenomenon 28: TCL 2975d color TV, grating top and bottom compression. Troubleshooting prompt: the voltage at each foot of ic301 (tda8351) is normal. Suspected that the output of the ic201 (om8838) out-of-band waveform is incorrect. The 3-13 Line Backward pulse transmission circuit is true. Check the external circuit components related to the formation of the sawtooth wave, as shown in 3-14, and find the r232 (39 K) increase the resistance to 60 K. In the process of generating a circuit with a saw-tooth wave, the resistance value of r133 directly affects the reference current value of c231 charging. Changes in r232 resistance will inevitably lead to linear variation of the field sawtooth wave, resulting in linear distortion of the grating. After r232 is changed, the grating is restored to normal. Fault Phenomenon 29: 2911dz color TV, repeatedly burning line tube. Troubleshooting prompt: the excitation voltage of the line pipe is normal. There is no exception in the line change and line excitation transformer. After replacement of c416 (470pf/2kv), the test server will not burn the line pipe. See figure 3-13. c416 is a high-voltage capacitor. C416 and c417 partial pressure generate line back pulse signal, if c416 performance is poor, then feedback to the OM8838-41 foot line back signal exception, line tube due to the extended conduction time and burned. Fault occurrence: 30: Gbit/s, black screen. Troubleshooting Tips: This machine uses the om8838 (interchangeable with tda8841) movement, which is prone to black screen faults. According to the past maintenance experience, the fault is mostly depending on the put tube c4544 performance deterioration or the acceleration pole filter capacitor leakage, caused by the OM8838-18 foot (dark current feedback) voltage decreased, thus the emergence of black screen. However, the normal grating can appear when the acceleration pole potentiometer is adjusted repeatedly. And the machine repeatedly adjust the accelerator Potentiometer can not appear normal grating, test the OM8838-50 foot voltage is 4 V, the normal voltage is about 2 V, this foot is the ultra high pressure overvoltage protection input. It is found that the resistance of r238 on the external side of this pin has increased to 90 KB, as shown in 3-15. Troubleshooting after the resistance is changed. Fault occurrence 31: Gbit/s host. Black screen. Troubleshooting prompt: The 12 V voltage on the video panel is only 2.5 V. After checking the sound effect, the m62438 VCC foot is short-circuited to the ground and the m62438 is replaced. If this integrated block is not available, a wire can be used to connect the left-right channel input and output ports during emergency repair. Figure 3-14 schematic 3-15 abl circuit 3.23 TB movement 3.23.1 main iccpu color TV configuration list: tmp87ck38n, TCLM05-V3, small, tclm5c02, TCL M06-V0, TCLM06-V2, TCL M06-V3, TCL 06vd-t, TCL 06-v3 T, TCL 06v7a, TCL M06-V6, tmp87ps38nm17, tmp87ps38n, TCL m34/33, TCL M13VD-T, mn101c46; small Signal Processing: tb1231n, tb1238an, tb1240n3.23.2 bus adjustment method model 1436a, 1701as, 2108, 2108b, 2101a, 2101as, 2101c, 2101f, 2129a, 2166b, 2169a, 2178a, 2109c, 2129c, 2102, 2103c, 20176c, 20176a, 2169a, 2128b, 2 169c, 2136 W, 00006f, 00009a, 2501a, 2501c, 2501f, 2502, 2568c, 2511c, 2536c, 2501my, 2175mu, 2536f, 2503c, 2506a, c2533, c2533f, 2536c, 2510c, 2536 W, 2906a, 2907, 29098, 29528, 2913a, 2919az, 2968az, 2901c, 2909a, 29698, 2976a, 2976c, 2966g, 2966gl, 2901a, 2901f, 2175mu 2518wt, 2575sm, 25a0000f, 250000f, 2175mu, 2518wt, 2575sm, 25a0000f, 250000f, 2916mt, 2980ua, at2965, at2965a, 3418tt, 3460gt: press the Panel vol-Key to 0. at the same time, press the display key on the remote control. S indicates entering in the upper-right corner of the screen. Press the numbers 0, 2, 3, 5, 8, and 0 to select a menu. Use the volume key and Program Key to adjust the menu and select options, and remotely shut down and exit. Large Screen Machine Entry Method: Press and hold the TV panel sound key to 0, and press the 0 key on the remote control three times within 1.5s to enter. first, go to system settings 2 and set "fmode" to on. After the bus is adjusted, the item is switched to off. Press the key to return to the upper menu or exit the bus. If the total power supply is switched off, the modified data is not retained. 3.23.3 Bus Fault fault phenomenon L: cannot switch off. Maintenance tip: Enter the maintenance status. Use the up/down arrow keys on the remote control to select the first main menu, press the right arrow key to enter the first main menu, and press the up/down arrow key to select the mains AC shutdown project acpwr, it is found that the Set Data is changed from enable (valid) to disable (invalid). After you press the left/right arrow key on the remote control and change the data to enable (valid, press the key twice to store the data and exit the repair status. then press the key to resume normal shutdown. Fault symptom 2: When you watch a program during the automatic search process, the machine automatically stops searching and displays "255" on the screen ". Troubleshooting prompt: the fault is caused by an internal data error in the memory. simply re-write the human data or replace the memory. Fault symptom 3: The program key on the local computer or the program key on the remote control does not work, or both do not work. Troubleshooting Tips: Change the memory and adjust the grating geometric parameters and white balance. Fault Phenomenon 4: During the automatic search process, when the image is quickly searched, it is automatically shut down. Maintenance Tips: first enter the bus adjustment status, record the data, and then change to a new storage. Enter the raw data. Fault 5: press the Program Key of the remote control to shut down the TV. Maintenance Tips: first enter the bus adjustment status, record the data, and then change to a new storage. Enter the raw data. Fault Phenomenon 6: Image lines and fields are not synchronized. Troubleshooting Tips: Change the memory and adjust the grating geometric parameters and white balance. Fault Phenomenon 7: The sound is large and small, and cannot be properly controlled. Maintenance Tips: use the same type of storage; enter the bus adjustment status, and change the last two sound data items in the white balance menu to "0 "; replace m06v6 with m06v03 (no sound5 or sound20 projects ). Fault occurrence 8: Only programs in the U segment can be received, and programs in the L or H segment cannot be received. Troubleshooting Tips: Change the memory and adjust the grating geometric parameters and white balance. Fault Phenomenon 9: The image edge appears light blue borders, the color is not normal, or when the TV signal is automatically searched, the characters disappear. It cannot be stored. Troubleshooting prompt: when the content of the chip item (chip selection) in option2 is different from that of the local practical chip (tb1238 or tb1240), you can modify it. Fault Phenomenon 10: tb1238 movement color TV, the line is not synchronized. Troubleshooting prompt: Enter the repair status and change the hafc item data to "00. 3.23.4 hardware fault common fault phenomenon L: tcl2101as color TV (tb1231 Movement), three nos, slight "Squeak" sound in the machine, + B voltage (normal value + 112 V) at 10 V ~ Fluctuation between 65v. Troubleshooting Tips: d806 has poor performance, as shown in Figure 3-16. After the performance of the d806 is deteriorated, the q804 baseline positive feedback signal of the switch is weakened. In a period, the saturation conduction time of q804 is shortened, and the output voltage is decreased. Figure 3-16 switch power supply Feedback Circuit Fault Phenomenon 2: tcl2510g color TV (tb1238), power indicator light on and flashing, the whole machine cannot start, + B voltage in 0 ~ Periodic fluctuations between 50 V. Troubleshooting prompt: q80l B-E is broken down, as shown in 3-17. The prototype of q801 is d667 (12 V, 1a, 0.9 W), which is easy to damage. We recommend that you use the dda-3a transistor (80 V, 3A, 40 W ). Figure 3-17 ic801 Power Supply Circuit Fault Phenomenon 3: tb1238/1240 movement color TV with no color issues. Maintenance Tips: Enter the maintenance mode, adjust the factory data R-Y/B-Y GAIN-BAL from 0 to 15, G/y angle from 1 to 08: Fault Phenomenon 4: tb1238/1240 movement color TV, power cannot be started when the power supply fluctuates. Troubleshooting prompt: Change r804a to 68 K; cancel c810 (68pf/50 V ). Fault Phenomenon 5: tb1238/1240 movement color TV, with a "beep" sound when searching the station. Troubleshooting tip: Change c623 from 1 UF/50 V to 10 UF/50 V electrolytic capacitor. Fault 6: tb1238/1240 movement color TV. The indicator light is not on when it is started. Troubleshooting prompt: Change r843 from 10 K to 22 K. Fault 7: tb1238/1240 movement color TV, horizontal line interference on the image. Troubleshooting prompt: Increase c303 (0.33 UF/63 V) and change r811 from 470 Ω to 180 Ω 1/4 W. Fault Cause 8: tcl2101as color TV (tb1231 Movement), audio companion interference image. Troubleshooting prompt: the filtering capacitor c845 (100 UF/25 V) is invalid. The voltage obtained by c845 filtering is not only supplied to the Sound Amplifier (+ 18 V), but also to the intermediate frequency, video, color and scanning Processing Circuit in tb1231 (ic201. Fault Phenomenon 9: 2169c host, black belt 2cm wide on the right side of the screen. Troubleshooting Tips: after checking the TB1238-30 foot line back pulse disappears, resulting in line output excitation pulse phase shift, 3-18 shown. After the voltage regulator d404 (9.1 V) is replaced, the fault is rectified. 3.24 tda8376 machine core 3.24.1 color TV configuration list main LC diagram 3-18 Line Backward pulse transmission circuit model CPU: ctv591s. gw3; small signal IC: tda83763.24.2 bus Adjustment Method 2989gh, 3489gh, 3498gh open the user remote control, the integrated circuit PCA84C122AT-73 of the fifth foot and ground disconnected, welding 10 k resistance between the fifth and fourth feet becomes the factory remote control. Press the 0 Key to enter the repair status. 3.24.3 Bus Fault symptom: No programs in the frequency band can be received during searching. Maintenance tip: Enter the maintenance status, and adjust the project and data on the screen. Press program +/-to select work mode 1 and check that the project data is "01000110 ", while the normal data is "01000111", the last digit of this data is "1", which is the settings of the band of the very high frequency band. "1" is enabled, and "0" is disabled. Because the last data of this project is "0", the microprocessor does not have the voltage output for the control of the frequency band. After the project data of "1" is changed to the normal data "01000111, press TV to exit the service status, restart the system, and search for troubleshooting. 3. 25 L a768xx machine core 3.25.1 color TV configuration list core: lc863354, la863328, lc863540b, TCL m28v1; small signal IC: la76832, la76828 models 2da-e, 2118e/EW/W, 2129e, 1273e, 1418 TB, c2133, 2175 w/e, 2129e, latest/EW, c2533e, 3418e, 2918e, 2918ew, at25e159, at25189, at2513eb/e, at2906e, at29189, at29e159, at34189e, 2818e, 2977e, 2536e, 2977e3. 25.2 adjustment method for bus "T1" Menu entry method: disassemble the user remote control (RC-C01T), in the India and India printing board D-mode position (lower left corner) plus a key, directly press this key screen display "T1" character, enter the bus mode debugging, press "volume +" to enter the bus adjustment menu, press "program +/-" key option, and press "volume +/-" to adjust data; press the menu key to exit the "T1" mode. Note: Only when engineeroption in menu03 is set to l can the preset menu after 04 be entered. "T2" debugging menu entry method: Press and hold the "vol-" key on the panel to 0, and press the "0" key on the remote control three times (must be completed within 1.5 seconds ), the screen display "T2" character, that is, entering the adjustment of each project (less content than the set menu) adjustment method is the same as "T1 ". Remotely shut down and quit. At25a192 type TV bus Entry Method: press the menu key, when the menu appears, quickly press the number key 9, 5, 9, 9? Go to Step 9 and Step 6. Press "P +/-" to select a project and press "vol +/-" to adjust data. Press the menu key to exit. 3.25.3 Bus Fault symptom L: No Brightness Signal. Only dimly colored images are available. Troubleshooting prompt: Enter the bus and change the cross B/W data in menu 09 to "0. Csoss B/W is the test signal option, "0" is a normal image, "1" is a non-Brightness Signal, "2" is a whiteboard grating, "3" is a black screen white field signal. Fault symptom 2: The remote control is normal and the buttons on the local machine are ineffective. Maintenance Tips: first enter T1 mode to record the original data in each menu, then replace the memory, and restore the original data. Fault symptom 3: No AV function. Tip: Enter menu 11 in T1 mode, select the OPT-AV-SYSTEM item, and change its data to "2. Fault Phenomenon 4: the automatic search function becomes clear, and the automatic search function becomes invalid. Maintenance Tips: You can recover it by using a memory with raw data. Fault Phenomenon 5: no voltage monitoring function. Troubleshooting prompt: Go to menu 13 in T1 mode, select opt-power-off, and change the data to "1. Fault occurrence 6: no strong reception function. Tip: Enter menu 11 in T1 mode, select the OPT-SPER-RECEIVE item, and change its data to "2. Fault Phenomenon 7: The mains voltage meets the requirements (AC130V-AV260V), but the screen voltage is less than 130v please shut down the words, that is, automatically into the STANDBY state. Troubleshooting prompt: Go to the menu13 menu in T1 mode, select the power-low item, and change its data from "5" to "1. Fault Phenomenon 8: The mains voltage meets the requirements, but the screen voltage is higher than V, please turn off the words, then enter the STANDBY state. Troubleshooting prompt: Go to menu 13 in T1 mode, and adjust power-low item data to "13" and power-high item data to "15. Fault Phenomenon 9: The screen displays the dashboard and the image is dimmed and blurred. Repair tips: Enter the factory mode, menu 06 CROSS-B/W items (repair test signal) from "3" to "0. Fault Phenomenon 10: after the power switch is enabled, You need to press the standby key on the remote control to start up. Troubleshooting prompt: in T1 mode, change the opt-last-power option in menu 12 from "0" to "1. Fault symptom 11: The server cannot be saved for search. Troubleshooting tip: Enter T1 mode, change the VIF-SYSTEM-SW item (VCO frequency setting) in menu 08 from "1" to "0. 3.25.4 hardware fault common fault phenomenon 1: at25189 color (la76828), occasionally burned pipe. Troubleshooting tip: As shown in 3-19, the performance of the d833 (fr104) V is poor, resulting in unstable power supply for the + 9 V line, that is, the voltage of the la76828 (ic201)-25 feet is unstable. Figure 3-19 + 12 V voltage output circuit fault phenomenon 2: 22.16e machine, remote control failure, character left and shaking drawing. Troubleshooting Tips: The CPU-18 foot external capacitor c034 (33nf) leakage, new after normal. Fault symptom 3: 2166e model (the power supply part is tda16846. Troubleshooting Tips: The CPU-18 foot external capacitor c034 (33nf) leakage, new after normal. 3.26 PDP Movement (plasma) Main iccpu: p89c61, 80c32plcc3. 26.2 bus Adjustment Method models pdp402, pdp403, pdp4225, pdp4226 (1) pdp402 Entry Method: Hold down the 0k key on the remote control and press the Input key below the display screen for 5 s,. Press "P +/-" to select a project and press "vol +/-" to adjust the data (set-top box power off). Press "OK" to save the data, press "Av/TV" to exit the bus. (2) pdp403 Entry Method: when the volume is 0, press and hold the volume reduction key on the machine item box, and then quickly press the number keys 9, 5, and 1 on the remote control to enter. (3) pdp4225 Entry Method: You must debug the remote control before entering. 3.27 main iccpu for back-cast color TV: tmp87ck38n3.27.2 bus Adjustment Method models: hid435r and hid525b. r, hid432b. r, hid435b. r9hid435r access method: Use the user's remote control to quickly press adjustment, shift, static, and menu key to enter, and press the display key to exit the bus. Lct4312 Entry Method: In the STANDBY state. Press the "vol-" Key more than three times, then press the menu key on the control panel more than three times, and then start the system to enter. 3.27.3 hardware fault common fault phenomenon 1: hid4321h color TV with flashing light and no power-on. Troubleshooting prompt: Test + B voltage, the first boot is 135 V, a few seconds later it becomes 0 V, suspected load short circuit, but no problems found through measurement. The analysis circuit shows that q8010 is saturated with the/standby control transistor after normal startup, as shown in 3-20. In order to quickly identify the fault point, the trial wire is temporarily connected to q8010c and E pole, and there is no grating in the lower part of the screen. After the field block is replaced, the fault is rectified. Figure 3-20 fault of the standby control circuit 2: models of back-casting color TV (P6/P9 Movement), such as hid435, hid432b. R, and hid438sb. R. Troubleshooting Tips: the common causes of the machine failure are the startup resistance r8009, r8010, r8004, r8005, and r8006 open circuit, as shown in 3-21. Figure 3-21 Power Supply startup circuit fault phenomenon 3: hid435 back-cast color TV, three none, data recovery, indicator light green. Troubleshooting prompt: the protection circuit resistance r8071 (22 K) of the power supply is open. When the r8071 open circuit is enabled, the voltage of V passes through the resistance r8072 and is pressurized to the d8048 (13 V) positive pole of the Voltage Regulator diode, so that the d8048 breaks down and the protection circuit starts to control, as shown in 3-22. Figure 3-22 Overvoltage Protection Circuit
