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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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philips tv problem
Hi
I have Phlips 27"tv model 27pt543s37a.The problem is HOT burned.I check hot(BU4508DX) and it was short between base collector and emmiter.Replaced for a new one.Some forums says that cause this short capasitor C2455.I replaced it as well.There was diode 6460 on the board shorted also.Replaced it.So when I turn on tv looks like High Voltage to CRT comes on but after few seconds it shorts HOT again and make inpulse noise.Checked HOT again and it was completely shorted all over again.Suspect bad flyback but not sure.Is anybody has a similar problem with this model?thanks |
#2
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philips tv problem
"max" wrote in message .. . Hi I have Phlips 27"tv model 27pt543s37a.The problem is HOT burned.I check hot(BU4508DX) and it was short between base collector and emmiter.Replaced for a new one.Some forums says that cause this short capasitor C2455.I replaced it as well.There was diode 6460 on the board shorted also.Replaced it.So when I turn on tv looks like High Voltage to CRT comes on but after few seconds it shorts HOT again and make inpulse noise.Checked HOT again and it was completely shorted all over again.Suspect bad flyback but not sure.Is anybody has a similar problem with this model?thanks Not particularly specific to this actual model, another couple of very common causes of HO transistor failure in any HOP stage of this type, are the coupling components in the base of the transistor, failure of which can lead to a very bad waveshape which causes the transistor to over-dissipate and fail in short order, and bad joints on the driver transformer, where one is used. Also, carefully check for bad joints on the HOP transformer itself. It's fairly hard to diagnose a faulty (as in shorted turns) transformer for certain, without using either a ring tester, or having a replacement known good one to try by substitution. Arfa |
#3
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philips tv problem
On 24 ene, 08:19, max wrote:
Hi I have Phlips 27"tv model 27pt543s37a.The problem is HOT burned.I check hot(BU4508DX) and it was short between base collector and emmiter.Replaced for a new one.Some forums says that cause this short capasitor C2455.I replaced it as well.There was diode 6460 on the board shorted also.Replaced it.So when I turn on tv looks like High Voltage to CRT comes on but after few seconds it shorts HOT again and make inpulse noise.Checked HOT again and it was completely shorted all over again.Suspect bad flyback but not sure.Is anybody has a similar problem with this model?thanks possibly also the line o/p transformer is duff. next time, wire a 60w bulb across c-e of the HOT without the transistor. measure the voltage, should probably be about 130-150v for this size set. -B |
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