Sylvania 6842THG, Руководство по обслуживанию

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1-8-1 L0700TR
TROUBLESHOOTING
1. POWER SUPPLY SECTION
Problem Details of Condition Checking Parts (Ref. No.)
1. Malfunction
occurs in stand-
by mode.
The voltage of both ends on C2115 is 0V or lower than
170V.
F601
F601 is cut off.
R2001 and R2004 are cut off, or smoke.
IC2100, IC2200, IC2300, IC2400
Q2101, Q2102, Q2600
D2101, D2106, D2153
R2105
F2200 is cut off. IC2200
F2400 is cut off. IC2400
5V is not outputted to VSUB 5V.
[After oscillating, oscillating stops. (Overvoltage
latching)]
IC2403, IC2450
F2400
D2400, D2401, D2405, D2407, D2452, D2456, D2463
Stand-by consumption power is too high.
(Not oscillating intermittently. Abnormal oscillating.)
IC2401
Q2400, Q2401, Q2402,Q2403, Q2404
D2411
2. Cannot power
on.
RY2000 does not turn on.
(DC16V is not outputted.)
IC2401
Q2400, Q2401, Q2402
D2403, D2404, D2414, D2416
PFC does not oscillate.
(The voltage of both ends on C2115 does not reach for
approximately 385V.)
IC2100, IC2101
Q2100, Q2103, Q2104, Q2105, Q2106, Q2108
D2103, D2105, D2109, D2110
3. The power turns
off immediately
after turning the
power on.
(D2506 blinks.)
Protect 1
functions.
If removing D2503, the unit turns the
power on normally. (5V line is poor.)
Q2451, Q2452
If removing D2505, the unit turns the
power on normally. (15V line is poor.)
IC2451
D2452, D2454
If removing D2510, the unit turns the
power on normally. (3.3V line is poor.)
IC2454
Q2453, Q2454
D2452, D2455, D2460
If removing D2504, the unit turns the
power on normally. (VE line is poor.)
Q2850, Q2851, Q2852, Q2853, Q2854, Q2855
D2850, IC2853
If removing D2500, the unit turns the
power on normally. (Vset line is poor.)
Q2600, Q2601, Q2602, Q2750, Q2751, Q2752, Q2753, Q2754,
Q2755
IC2600, IC2601, IC2754, D2600, D2602, D2603, D2750, D2751
If removing D2501, the unit turns the
power on normally. (Vscan line is poor.)
Q2600, Q2601, Q2602, Q2650, Q2651, Q2652, Q2653
IC2600, IC2601, IC2651, D2600, D2602, D2603, D2750, D2751
Protect 2
functions. If R2537 is shorted, the unit turns the
power on normally.
Refer to “ 2. Cannot power on“ section.
ADD-
MONITOR
function.
ADD-MONITOR (IC2500 : 32pin) voltage
is lower than 3.5V.
Refer to “4. Vdata is poor“ section.
SUS-
MONITOR
function.
SUS-MONITOR (IC2500 : 31pin) voltage
is over 2.5
±
1V.
Refer to “5. Vsus is poor“ section.
4. Vdata is poor. The waveform of T2300 stops oscillating or abnormal.
Q2300, Q2301, Q2302
D2300, D2302, D2304, D2353
IC2300, IC2301, IC2350
5. Vsus is poor. The waveform of T2200 stops oscillating or abnormal.
IC2201
Q2201
D2202, D2204, D2205, D2211, D2212, D2213, D2214, D2215