Service manual

SERVICE MANUAL LS07 chassis
25
resistance R23 become large. So the pixel clock inside of the MST518 can not
vibrate, result in the A/D converter of MST518 internal can not work normally .
so appear no picture in VGA mode and “signal beyond boundary” on TFT
screen.
Example 4 Can control TV by remote control, but can not control TV by
key-press panel
Troubleshooting phenomenon: imagesound is ok under any source, use
remote control to operate each function is ok, but can not control by using the
key-press panel, failure completely.
The process of maintenance: first check the socket of J6 on mainboard ,the
solder and touch of connector are ok or not. if it is ok, check the key-press
panel ,measure each resistance, find R1 open circuit, change it .
Example 5 The image is ok after turn on the TV, but left speaker has no
sound output
Troubleshooting phenomenon: the image is normal in TV mode, but the
left speaker has no sound output, using remote control to operate ,each
function is ok. use AVPC audio input ,is still no sound output.
The process of maintenance: measure the waveform from 60
th
pin of UOC
by oscillograph, according to signal flowchat, measure R227R157U8C130
one by one, and observe the waveform is ok or not, find the back end of C130
have not waveform, change C130 and troubleshooting dissappear .
Chapter Five Spare part lists and easy damage
part list
CHD-TD170F7
Material name typemodule NO. Material code remark
Face frame JUJ8.074.036 8807400360J
Suspend screen JUJ8.640.017 8864000170J
Back cover JUJ8.074.037 8807400370J
base JUJ8.070.012 8807000120J
Accessories bag JUJ6.479.049 8647900490J
Mainboard
groupware JUJ6.690.032-5 8669000325J
Samsung
screen use
Mainboard
groupware JUJ6.690.030-11 86690003211J
LG screen
use
DVD drive TDR-085 59C11060850
Decode panel
groupware JUJ6.693.013 8669300130J
Remote control JUJ6.694.016 8669400160J