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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Phillips/Magnavox Chassis 25800
Model # 25TR19C221,
Turn set on and High voltage comes up to about 28K and the set shuts down. Flyback rings ok using the scope cal jack. Have 130VDC to the H-out transistor, I did find the Vert IC shorted pin 6 (vert supply) to pin 5 (output). Replaced the IC, But still wont stay on. Tried reducing the line voltage, still will not stay on long enough to check anything. Cant get any fault codes, Anyone have any tips on this one? Thanks Charlie |
#2
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Phillips/Magnavox Chassis 25800
may be the high voltage transformer faulty
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#3
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25F8 was: Phillips/Magnavox Chassis 25800
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#4
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Phillips/Magnavox Chassis 25800
This type of fault can get complex, and require a lot of patients. If the
vertical scan is still failed, the set will not be allowed to start. It is also possible that the flyback is defective, or there is something on the secondary side that is loading it. If the CRT is defective, the set may also go in to the protect mode. You can usually check this by removing the CRT socket assembly, and then seeing if the HV will come on and stay on. If so, then you know that there is a short in the CRT. If you get high voltage, after shutting the set, make sure you discharge the CRT at both the anode cap, and at the socket end before putting back the socket assembly. -- JANA _____ "Charlie East" wrote in message ... Model # 25TR19C221, Turn set on and High voltage comes up to about 28K and the set shuts down. Flyback rings ok using the scope cal jack. Have 130VDC to the H-out transistor, I did find the Vert IC shorted pin 6 (vert supply) to pin 5 (output). Replaced the IC, But still wont stay on. Tried reducing the line voltage, still will not stay on long enough to check anything. Cant get any fault codes, Anyone have any tips on this one? Thanks Charlie |
#5
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Phillips/Magnavox Chassis 25800
Update---- Went thru the Troubleshooting from the Phillips Force CD for this
set, It led me to a point where it said I had a Filament problem causing shutdown. The picture tube Are not shorted to any other pins, Set still shuts down with the CRT socket removed. I guess this is monitored some where off the flyback, , Will let you know when I find the problem Charlie "JANA" wrote in message ... This type of fault can get complex, and require a lot of patients. If the vertical scan is still failed, the set will not be allowed to start. It is also possible that the flyback is defective, or there is something on the secondary side that is loading it. If the CRT is defective, the set may also go in to the protect mode. You can usually check this by removing the CRT socket assembly, and then seeing if the HV will come on and stay on. If so, then you know that there is a short in the CRT. If you get high voltage, after shutting the set, make sure you discharge the CRT at both the anode cap, and at the socket end before putting back the socket assembly. -- JANA _____ "Charlie East" wrote in message ... Model # 25TR19C221, Turn set on and High voltage comes up to about 28K and the set shuts down. Flyback rings ok using the scope cal jack. Have 130VDC to the H-out transistor, I did find the Vert IC shorted pin 6 (vert supply) to pin 5 (output). Replaced the IC, But still wont stay on. Tried reducing the line voltage, still will not stay on long enough to check anything. Cant get any fault codes, Anyone have any tips on this one? Thanks Charlie |
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