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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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TXF2899 - Sound but no picture!
I am working on a Samsung TV model TXF2899 that has sound but no
picture. The filaments are lit. Screen and HV are good. The picture appears to be blanked. I checked the CRT, it checks good. It appears however that the signal from CXA1477AS is no good. The input is good. I am suspecting IC501 (CXA1477AS) to be defective but am still not quite convinced. I'm not quite sure if I am missing something. If anyone know or has had a similar problem please respond! Thanks! Tyrone |
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#2
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TXF2899 - Sound but no picture!
Also, another problem is that you cannot switch to any A/V input using
the remote or front switch assy. Channel and volume switches appropriately. I checked the clock and data lines and even changed EEPROM but still no change. |
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#3
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TXF2899 - Sound but no picture!
The flyback transformer is common in these units to give no raster, or
raster after 20 minutes or so. FUH29A001 (S) I think. Measure the G2 at the CRT board. The picture will likely come back. Also, the vertical could be bad. Turn up the G2 & you MAY have just a line. Dani. wrote: I am working on a Samsung TV model TXF2899 that has sound but no picture. The filaments are lit. Screen and HV are good. The picture appears to be blanked. I checked the CRT, it checks good. It appears however that the signal from CXA1477AS is no good. The input is good. I am suspecting IC501 (CXA1477AS) to be defective but am still not quite convinced. I'm not quite sure if I am missing something. If anyone know or has had a similar problem please respond! Thanks! Tyrone |
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#4
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TXF2899 - Sound but no picture!
I've tried that as well. no vertical line, picture looks washed out
with screen turned up. My first thought was the screen cap, I've had a few samsungs with bad screen caps but not the case on this one! But thanks for the response! Tyrone Dani wrote: The flyback transformer is common in these units to give no raster, or raster after 20 minutes or so. FUH29A001 (S) I think. Measure the G2 at the CRT board. The picture will likely come back. Also, the vertical could be bad. Turn up the G2 & you MAY have just a line. Dani. wrote: I am working on a Samsung TV model TXF2899 that has sound but no picture. The filaments are lit. Screen and HV are good. The picture appears to be blanked. I checked the CRT, it checks good. It appears however that the signal from CXA1477AS is no good. The input is good. I am suspecting IC501 (CXA1477AS) to be defective but am still not quite convinced. I'm not quite sure if I am missing something. If anyone know or has had a similar problem please respond! Thanks! Tyrone |
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