Dicas Reparação HITACHI
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Hitachi | C2886TN | Procedure to enter the service mode | Press & hold the menu key the installation line should now appear, with the install menu displayed press both the volume up and down buttons for about 8 seconds until the service option is available then follow the on screen directions | ||
| Hitachi | C28W410SN | Sound crackles and whistles a short time after switch-on. Gets worse as set warms up | Solder all links and components that have unpainted copper areas around component legs on upper side of main board near to the audio processing I.C. The same applies to the components near the microprocessor | ||
| Hitachi | C28W410SN A7 | The set reverts to standby intermittently | Set HT control had invisible dry joints | ||
| Hitachi | C2146TN | Dead / int, led lit | Check the 5v regulator IC952, 8v regulator IC951, standby regulator IC950 and the field output chip TA8427K or for dry joints on the regulators | ||
| Hitachi | C1714T | Frame collapse, causing set to go dead, also can cause the regulator transistor, to go s/c. BUT12AF. H.T. unstable | Check R951 39K goes high, in this case 65K, causing HT to go high | ||
| Hitachi | C2846TN 311 | Frame collapse or dotted line | Check and replace frame ic TA8427K or check R710 for open circuit, also check for possible dry joints on D601 | ||
| Hitachi | VTM640 | Low video level | Replace C1530 47uF, 16v | ||
| Hitachi | C2133TN Nokia Stereo Plus | Very strong red content in the picture, sometimes the fault would clear with the strong red content fading until the correct greyscale was achieved | After much searching around i found the problem. There was a very small crack in the solder at RH23, this is a 2K4 surface mounted resistor located at the back of the tube base. Resoldering both sides of it cured the fault | ||
| Hitachi/Fujian | HFS1425 | Store function inoperative-Does not hold memories. | Pin2 of M58655 memory chip, must be at -30V. If not, check/ replace C920 1uF/250V cap. | ||
| Hitachi/Fujian | HFS1425 | Store function inoperative-Does not hold memories. | Pin2 of M58655 memory chip, must be at -30V. If not, check/ replace C920 1uF/250V cap. | ||
| Hitachi | TN2166/2146 | St/by only - HT=90v | Dry joint IC952 5v reg | ||
| Hitachi | TN2166/2146 | POWER SUPPLY TRIPS | SUSPECT DRY JOINTS ON IC952 | ||
| Hitachi | PAL4 | Frame - foldover after 10 mins. | C613 ( 100u f ) o/c. | ||
| Hitachi | NP9A | Width - reduced. | R756 o/c. | ||
| Hitachi | NP9A | Tripping. | Q905 ( 2SA673 ) o/c. |