Read Panasonic PT-TX400 / PT-TX310 / PT-TW340 / PT-TX210 / PT-TW250 (serv.man3) Service Manual online
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Troubleshooting
No picture
Follow the procedures below.
No picture with all input
sources
sources
Check signal adjustment loop and LCD driving loop;
Check power supply circuit S16V and peripheral circuit.
Check IC1001, IC8001 and peripheral circuit.
Check power supply circuit S16V and peripheral circuit.
Check IC1001, IC8001 and peripheral circuit.
No picture with PC2 input
source only
source only
Check if the HV Sync signal of IC4009's 8th/11th pin is normal;
Check if the IC1001's peripheral circuit, R1191/R1194 have H/V
Check if the IC1001's peripheral circuit, R1191/R1194 have H/V
Sync.
Check PC/AV source selecting loop and processing loop;
Check IC4009 and peripheral circuit.
Check IC4009 and peripheral circuit.
No picture with all
computer input sources
computer input sources
Yes
Yes
No
No
No
No
Check AV source selecting loop and decoding loop;
S-Video source
Check S-video sign (Y/C).
Check if IC1001's peripheral capacitor C1803 has signal.
Compound video source
Check the composite video source (video).
S-Video source
Check S-video sign (Y/C).
Check if IC1001's peripheral capacitor C1803 has signal.
Compound video source
Check the composite video source (video).
Check if IC1001's peripheral capacitor C1805 has signal.
No picture with video
input sources
input sources
Yes
Check IC1001, IC4009 and peripheral circuit.
Check if the HV Sync signal of IC4009's 6th/3rd pin is normal;
Check if the IC1001's peripheral circuit, R1051/R1193 have H/V
Check if the HV Sync signal of IC4009's 6th/3rd pin is normal;
Check if the IC1001's peripheral circuit, R1051/R1193 have H/V
Sync.
No picture with PC1 input
source only
source only
Yes
Check IC1001<Scaler> and peripheral circuit.
No picture with HDMI
input sources
input sources
Yes
Yes
No
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