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Very fast service, best quality of the service manual and the schematics
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This service manual of the old video cassette recorder VT-LC50EM is very good readable even the tiniest numbers (i.e. IC-pins). The circuits are very clear. Many details of the schematic are very good described but in GERMAN language. Many schematic details - but complete at all. Common background information of several details are enclosed and physical knowledge of the TFT liquid crystal display for example. The manual lacks PCB drawings. If you understand german I would recommend this manual for you.
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Hi, this is a very clear manual, nice copy, not quite up to the standard of the very best available but better than many others. I think the price was especially fair for a hard to find manual and I would certainly use this manual seller again. Recommended.
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This schema available for me in good condition. I would highly recommend.
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Thanks for this "hard to find" service manual.
I apreciate the good quality of scanning and the pages scanned in A3 format.
1
2
3
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Step 3: HDMI
A
Step 3-2: CLK, DATA
Step 3-3: Tx
U
IC101 (pins 1-3, 121) VIDEO No Check the soldering of IC101. If soldering has not been done correctly, replace IC101.
W
D381 (Cathode) HPD No Check the soldering of D381. If soldering has not been done correctly, replace D381.
Is there a clock ?
Is the voltage "H" (5 V)?
U
B
Yes
X
Yes DDC_TX No Check the soldering of IC301. If soldering has not been done correctly, replace IC301.
IC101 (pins D0-D23) No Check the soldering of IC101. If soldering has not been done correctly, replace IC101.
IC301 (pins 19, 20)
Is there a data ?
Is there a signal ?
U
Yes AUDIO (DVD) No Check the soldering of IC101. If soldering has not been done correctly, replace IC101.
Y
Yes
IC101 (pins 78, 88) Are there clock and data?
C
Q353 (pins 3, 6) Are signals the No Check the soldering of Q353. same as those at Pins 4 and 1 but whose voltage If soldering has not been done has been converted correctly, replace Q353. from 3V to 5V detected? Yes Yes
V
Yes IC201 (pin 11)
Z
Is there a data ? Yes Check the INTERFACE Assy and DIGITAL MOTHER Assy.
D
No
Check the soldering of IC201. If soldering has not been done correctly, replace IC201.
IC301 (pins 26, 27, 29, 30, 32, 33, 35, 36) TMDS_TX
Do signals (approx. 0.5 Vp-p) run in all the lines? Yes
No Check the soldering of IC301. If soldering has not been done correctly, replace IC301.
U
IC101 (pins 81-88) Are there clock and data? Yes AUDIO (DVD-AUDIO/Multi ch)
CN301
Is soldering of No Check the soldering of IC101. If soldering has not been done correctly, replace IC101. CN301 OK? Yes Replace CN301
No
Solder the CN301correctly.
V
E
IC201 (pins 12-18) Are there clock and data? Yes Check the INTERFACE Assy and DIGITAL MOTHER Assy. No Check the soldering of IC201. If soldering has not been done correctly, replace IC201.
F
214
1 2
VSX-74TXVi
3 4
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