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Position:IcFull.com » IC Electronic information » Category: H

IC Electronic information

Hisense TV Model TC-2539 failed to receive weak signals

In Electronic Infomation Category: H | on April 27,2011

Symptom: to receive weak signals,

Determine maintenance: First of all ruled out due to signal problems caused by the failure, the measured AFT and SN74S38N datasheet and AGC voltage high-frequency head were normal. With "interference Law" on the IF output signal detection, the multimeter set R l k profile black table pen ground, the red pen to touch N201 pin video signal input, the screen appears obvious interference fringes, indicating that after the great N201 circuit is normal. Continue to touch the N201 47 ~ 48 feet IF signal input, there is still interference fringes appear. O.O1 F capacitor used across a surface acoustic wave filter Z161, then the image has significantly improved. Replacement Z161, some programs back to normal, but the U section of the program is still snow. Measurement of pre-discharge tube V106 in no exception. Reduced ability of suspected V106 Zoom. 2SC2216 transistor with its replacement, troubleshooting.

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