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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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Mitsubishi CS-35707 TV Repair for pincushion
I have a Mitsubishi 35" TV Model CS-35707 that all of a sudden the
screen became a pincushion effect. The sides are bowed in about 4 inches each. I have gone into the service mode and altered the pincushion settings but no changes occur. Does anyone know how I can obtain a schematic or which components need to be replaced to fix this? A repair technician came out and said a few capacitors and transistors need to be replaced and the cost would be about $300-330 to repair. After three days, the owner of the shop called me and said it will cost $450.00 and they will have to pick the tv up and take it to the shop for repair. I questioned the fact that they changed the estimate after the technician left and he said I should get it repaired elsewhere. Can anyone help with this? I am a computer/printer/fax technician and can replace components but don't know which cause this problem. |
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Sad news is that the shop manager found out it was a Mitz set from the era
of capacitor problems. The set does need to go in so that every single electrolytic capacitor can be checked and replaced as needed. It is a very time consuming job. Add the pincushion parts failure on top of that and it is indeed a real job. You need to start by troubleshooting and repairing the pincushion circuit and esr check the capacitors in the pin circuit to start with that failure. Then the remainder of the sets capacitors need the usualy esr check, visual check, and any others that cannot be verified that way pulled for full out of circuit testing. It is STRONGLY suggested that you take the tv into a long established and experienced servicer that has lots of experience with Mitz sets. Probably an independent Mitz authorized servicer would be best. Many of the big box stores will be more interested in selling you a new tv rather than repairing the set. It will cost $300 or so for a complete repair. David |
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This is a ZA chassis set from 1996 and is NOT one of the sets that has
widespread capacitor problems. In fact, these sets have been very reliable, aside from some failures in IC6F01 which affect CRT drive levels. There is no reason to replace this set at this point, as the CRT likely has many more years of good life left. The service manual is available from Mitsubishi for $47.50 retail. There is no reason to check every cap in this set. A quick visual inspection and a check of caps that are likely prone to failure due to application like any other set in the shop for service is reasonable here. It needs troubleshooting of the pin circuits and this will be difficult for someone not familiar with television repair, perhaps difficult without a schematic, depending on the skill of the tech. $300 would be high for this kind of problem in this set, but that is hard to say until it is diagnosed. More likely under $150 in our shop in Gainesville, FL, plus an extra hundred or so for having to lift the darned thing. Actually, we charge $70 pickup and delivery if we need to bring it in. Normally, if the client does not bring it in, we evaluate the problem in the field and just bring the chassis in for shop repair if we can't fix it on site. Leonard "dkuhajda" wrote in message ... Sad news is that the shop manager found out it was a Mitz set from the era of capacitor problems. The set does need to go in so that every single electrolytic capacitor can be checked and replaced as needed. It is a very time consuming job. Add the pincushion parts failure on top of that and it is indeed a real job. You need to start by troubleshooting and repairing the pincushion circuit and esr check the capacitors in the pin circuit to start with that failure. Then the remainder of the sets capacitors need the usualy esr check, visual check, and any others that cannot be verified that way pulled for full out of circuit testing. It is STRONGLY suggested that you take the tv into a long established and experienced servicer that has lots of experience with Mitz sets. Probably an independent Mitz authorized servicer would be best. Many of the big box stores will be more interested in selling you a new tv rather than repairing the set. It will cost $300 or so for a complete repair. David |
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