Troubleshooting - Sony TA-ZH1ES Service Manual

TA-ZH1ES
1. Power does not turn on
Power does not turn on.
The condition does not change even after reconnecting the
POWER SUPPLY board to the DIGITAL board.
The condition does not change even after connecting the
new POWER SUPPLY board to the DIGITAL board.
Fuse (F101) does not blow.
The connection cable of the connectors (CN603, CN604)
that is connected from the DISPLAY board to the DIGITAL
board is not removed nor broken.
The power cord is connected (standby), and the voltage
between pin 1 and 2 of the connector (CN100) on the
DIGITAL board is 14 V.
Voltage of STBY+3.3 V at JL2003 on the
POWER SUPPLY board is output.
Yes
Check if there is a P_ON signal at the following two points.
There is a sound from the power relay (RY100) on the
DIGITAL board.
Characters are displayed in the OLED display.
The following voltages are L.
DIGITAL board IC601: pin 14 (AC STOP)
DIGITAL board IC601: pin 49 (INIT (RESET))
The power can be turned on.
There are no problems with the parts around the switch
(S4002) on the DISPLAY board.
The power can be turned on.
End
24
SECTION 4

TROUBLESHOOTING

Yes
Yes
Yes
Yes
Yes
Yes
Remove the POWER SUPPLY board
No
connection, and there is voltage of around
6 V at both ends of the capacitor (C101) on
the DIGITAL board.
Complete to after replacing the IC2004 on
the POWER SUPPLY board to new part.
Yes
Yes
Yes
Yes
Yes
No
Complete when turned on.
No
Complete to after replacing the POWER SUPPLY board to
new board.
No
Replace the fuse (F101) to new part.
No
Re-insert or repair the connection cable.
No
Check if the DISPLAY board is shorted out (Check if the
transistor (Q4001) is broken or normal in particular).
Yes
Check if the transistor (Q600) on the DIGITAL board is
No
broken or normal (Replace the Q600 to new part, and check
for changes in the condition).
No
If they are not L, replace the transistors (Q601, Q602) on
the DIGITAL board.
No
Replace the DIGITAL board to new board.
No
Replace the parts around the switch (S4002) on the
DISPLAY board to new parts.
No
Replace the DISPLAY board to new board.
Yes
Yes
Yes
Check the diode (D100),
IC101, transformer (T100) on
No
the DIGITAL board, and
replace the abnormality parts
to new parts.
Yes
Yes
Yes
Yes
Yes
Yes